Mitsubishi Electronics Msz Fa25va User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS  
No. OB371  
SERVICE MANUAL  
Wireless type  
Models  
E1  
(WH)  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
(WH)  
CONTENTS  
1. TECHNICAL CHANGES ····································2  
2. PART NAMES AND FUNCTIONS······················3  
3. SPECIFICATION·················································5  
4. NOISE CRITERIA CURVES·······························6  
5. OUTLINES AND DIMENSIONS ·························7  
6. WIRING DIAGRAM ············································8  
7. REFRIGERANT SYSTEM DIAGRAM················8  
8. SERVICE FUNCTIONS ······································9  
9. TROUBLESHOOTING······································11  
10. DISASSEMBLY INSTRUCTIONS·····················31  
11. PARTS LIST······················································35  
12. OPTIONAL PARTS···········································38  
Indication of model name  
E1  
MSZ-FA25VA -  
E1  
MSZ-FA35VA -  
NOTE:  
This service manual describes technical data of the indoor units.  
E1  
E1  
E1  
•As for outdoor units MUZ-FA25VA- , MUZ-FA35VA- , MUZ-FA25VAH-  
and  
E1  
MUZ-FA35VAH- , refer to service manual OB372.  
•As for outdoor units MXZ-3A54VA- , MXZ-4A71VA-  
E1  
E1  
E1  
and MXZ-4A80VA-  
,
refer to service manual OB377.  
2
PART NAMES AND FUNCTIONS  
INDOOR UNIT  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
Air inlet  
PLASMA AIR PURIFYING filter  
Front panel  
Panel  
PLASMA DEODORIZING filter  
Fan guard  
Heat exchanger  
Anti-mold air filter  
Air outlet  
Vertical vane  
Horizontal vane  
Remote controller  
Line flow fan  
Auto front panel  
Display section  
Operation section  
When the unit starts operating, the  
front panel opens automatically to  
draw in air. When the unit stops  
operating, the front panel closes  
automatically.  
(When the front panel is opened)  
POWER lamp  
PLASMA/WASH lamp  
Auto front panel  
AREA lamp  
Emergency operation  
switch  
i-see Sensor  
Remote control  
receiving section  
WASH reset switch  
<Open> <Closed>  
i-see control operation  
AREA lamp indicate AREA setting  
In AREA setting, the horizontal air flow  
direction changes automatically according  
to the detection of i-see Sensor which detects  
the floor/ wall temperature to air-condition  
the room evenly.  
i-see sensor constantly measure  
floor/wall temperature to automatically  
adjust to the set temperature by  
estimating the temperature  
actually perceived by a  
person inside the room  
("sensible temperature").  
3
E1  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
ACCESSORIES  
Installation plate  
1
2
3
4
5
6
7
1
5
1
2
2
1
1
Installation plate fixing screw 4 o 25 mm  
Remote controller holder  
Fixing screw for 33.5 o 1.6 mm (Black)  
Battery (AAA) for remote controller  
Wireless remote controller  
Felt tape (Used for left or left-rear piping)  
REMOTE CONTROLLER  
Signal transmitting section  
Operation display section  
OPERATE/STOP  
(ON/OFF) button  
Temperature buttons  
Indication of  
remote controller  
model is on back  
Open the front lid.  
WIDE VANE button  
(Vertical vane button)  
FAN SPEED CONTROL button  
OFF-TIMER button  
ON-TIMER button  
OPERATION SELECT button  
ECONO COOL button  
TIME SET buttons  
FORWARD button  
BACKWARD button  
PLASMA button  
AREA button  
CLOCK SET button  
i-see button  
VANE CONTROL button  
(Horizontal vane button)  
RESET button  
4
3
SPECIFICATION  
E1  
E1  
Indoor model  
Function  
MSZ-FA25VA -  
Cooling  
MSZ-FA35VA -  
Cooling  
Heating  
Heating  
Single phase  
230V,50Hz  
Single phase  
230V,50Hz  
Power supply  
Air flow(Super High)  
594  
K/h  
K/h  
A
594  
612  
612  
Capacity  
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
Air flow(High /Med. /Low )  
Power outlet  
474 /354 /258  
474 /354 /252  
498 /384 /276  
498 /384 /264  
10  
0.25  
33  
10  
0.25  
33  
Running current 1  
Power input 1  
Auxiliary heater  
Power factor 1  
Fan motor current 1  
Model  
A
W
A(kW)  
%
57  
57  
A
0.25  
0.25  
Fan motor  
RC0J40-EB  
RC0J40-EB  
Dimensions WOHOD  
Weight  
mm  
kg  
780O298O198  
780O298O198  
10  
4
10  
4
Air direction  
Sound level(Super High)  
dB(A)  
42  
42  
W
W
W
W
W
W
W
W
W
Sound level(High /Med. /Low ) dB(A)  
36 /29 /21  
36 /29 /22  
Fan speed(Super High)  
rpm  
rpm  
1,220  
1,220  
1,250  
1,250  
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
Fan speed(High /Med. /Low )  
Fan speed regulator  
1,010 /800 /630  
1,010 /800 /610  
1,050 /850 /660  
1,050 /850 /640  
4
4
Thermistor RT11(at25:)  
Thermistor RT12(at25:)  
Thermistor RT13(at25:)  
Remote controller model  
k"  
k"  
k"  
10  
10  
10  
10  
10  
10  
KM05A  
KM05A  
When outdoor unit is MXZ type.  
E1  
E1  
Indoor model  
Function  
MSZ-FA25VA -  
MSZ-FA35VA -  
Cooling  
Cooling  
546  
Heating  
540  
Heating  
642  
Air flow(Super High)  
K/h  
K/h  
dB(A)  
dB(A)  
rpm  
Capacity  
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
516 /390 /258  
450 /348 /252  
420 /372 /264  
522 /402 /276  
Air flow(High /Med. /Low )  
42  
42  
W
Sound level(Super High)  
W
W
W
W
W
W
W
36 /29 /21  
36 /29 /22  
Sound level(High /Med. /Low )  
1,130  
1,120  
1,300  
Fan speed(Super High)  
W
W
W
W
W
W
W
W
W
W
W
W
W
W
1,080 /860 /630  
960 /790 /610  
910 /830 /640  
1,090 /880 /660  
Fan speed(High /Med. /Low )  
rpm  
NOTE : Test conditions are based on ISO 5151  
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:  
Outdoor Dry-bulb temperature 35:Wet-bulb temperature 24:  
Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:  
Outdoor Dry-bulb temperature 7: Wet-bulb temperature 6:  
Refrigerant piping length (one way): 5m  
w Reference value  
1 Measured under rated operating frequency.  
Specifications and rating conditions of main electric parts  
INDOOR UNIT  
Model  
-
E1  
-
E1  
MSZ-FA25VA  
MSZ-FA35VA  
Item  
Fuse  
(F11)  
(MP)  
T3.15AL250V  
Front panel driving motor  
i-see Sensor motor  
Horizontal vane motor  
Vertical vane motor  
Varistor  
NSEJ001DA1 12V DC 100"(at 25˚C)  
MP20Z 12V DC 300"(at 25˚C)  
MSBPC20M16 12V DC 250"(at 25˚C)  
MSBPC20M11 12V DC 300"(at 25˚C)  
ERZV14D471  
(MT)  
(MV1)  
(MV2)  
(NR11)  
(RR)  
i-see Sensor  
A2TPMI334F0V50HSOBA060P5L1J4S 5V DC  
3P  
Terminal block  
(TB)  
5
4
NOISE CRITERIA CURVES  
E1  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
FAN SPEED FUNCTION SPL(dB(A))  
LINE  
FAN SPEED FUNCTION SPL(dB(A))  
LINE  
COOLING  
HEATING  
42  
42  
42  
42  
COOLING  
HEATING  
Super High  
Super High  
Test conditions,  
Test conditions,  
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:  
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:  
90  
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:  
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15:  
90  
80  
70  
60  
50  
40  
30  
20  
10  
80  
70  
60  
50  
40  
30  
20  
10  
NC-70  
NC-70  
NC-60  
NC-50  
NC-40  
NC-30  
NC-60  
NC-50  
NC-40  
NC-30  
APPROXIMATE  
THRESHOLD OF  
HEARING FOR  
CONTINUOUS  
NOISE  
APPROXIMATE  
THRESHOLD OF  
HEARING FOR  
CONTINUOUS  
NOISE  
NC-20  
NC-20  
63  
125  
250  
500  
1000 2000 4000 8000  
63  
125  
250  
500  
1000 2000 4000 8000  
BAND CENTER FREQUENCIES, Hz  
BAND CENTER FREQUENCIES, Hz  
INDOORUNIT  
1m  
WALL  
0.8m  
MICROPHONE  
6
5
OUTLINES AND DIMENSIONS  
E1  
Unit : mm  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
INDOOR UNIT  
11o26 Oblong hole  
11o20 Oblong hole  
225 225  
55  
55  
Installation plate  
780  
155  
155  
320  
55  
335  
Air in  
70  
Wall hole [65  
Indoor unit  
198  
5
Installation plate  
Liquid line [6.35 - 0.5m  
Gas line [9.52 - 0.43m  
Insulation [35 O.D  
[19 I.D  
{
Drain hose [16  
(Connected part O.D)  
90  
Insulation [28  
53.5  
624.5  
102  
106  
58  
19  
Air out  
Required space (Indoor unit)  
Wireless remote controller  
75 or more  
75 or more  
7
6
WIRING DIAGRAM  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
MODELS WIRING DIAGRAM  
INDOOR UNIT  
INDOOR ELECTRONIC  
CONTROL P.C. BOARD  
4
3
2
1
RT13  
RT12  
TB  
CN  
TAB3  
F11  
S1  
S2  
S3  
BLK  
230V~  
112  
DB111  
T111  
TO OUTDOOR  
BLU  
RED  
CN  
UNIT  
2
1
RT11  
111  
12-24V  
NR11  
CONNECTING  
RED  
1
2
3
4
5
6
CN201  
LD  
BLK  
WHT  
YLW  
BLU  
5
MF  
LD104  
CN  
151  
CN  
1R1  
LD  
101(A)  
CN  
CN  
CN  
CN  
105(T)  
110  
1T1  
1T2  
1U1  
CN211  
5
2
3
8
3
3
4
5
5
5
2
INTERLOCK  
SWITCH(FAN)  
SW P.C.  
MP  
PLASMA_A  
PLASMA_D  
BOARD  
POWER MONITOR  
RECEIVER P.C. BOARD  
SAFETY DEVICE  
(PLASMA UNIT)  
MT  
RR  
MV1  
MV2  
NAME  
DB111 DIODE STACK  
SYMBOL  
MV2  
NR11  
NAME  
NAME  
SYMBOL  
SYMBOL  
RT12  
RT13  
T111  
VANE MOTOR (VERTICAL)  
VARISTOR  
INDOOR COIL THERMISTOR (MAIN)  
INDOOR COIL THERMISTOR (SUB)  
TRANSFORMER  
F11  
MF  
MP  
FUSE (T3.15AL250V)  
INDOOR FAN MOTOR  
FRONT PANEL DRIVING MOTOR  
i-see Sensor MOTOR  
PLASMA_A PLASMA AIR PURIFYING FILTER UNIT  
PLASMA_D PLASMA DEODORIZING FILTER UNIT  
TB  
TERMINAL BLOCK  
RR  
i-see Sensor  
MT  
RT11  
ROOM TEMPERATURE THERMISTOR  
MV1  
VANE MOTOR (HORIZONTAL)  
NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.  
2. Use copper conductors only. (For field wiring)  
3. Symbols below indicate.  
/: Terminal block,  
: Connector  
7
REFRIGERANT SYSTEM DIAGRAM  
E1  
E1  
Unit : mm  
MSZ-FA25VA -  
MSZ-FA35VA -  
INDOOR UNIT  
INDOOR UNIT  
Refrigerant pipe [9.52  
(with heat insulator)  
Refrigerant pipe [9.52  
(with heat insulator)  
Indoor coil  
thermistor  
RT12(main)  
Indoor coil  
thermistor  
RT12(main)  
Indoor  
Indoor  
heat  
heat  
exchanger  
exchanger  
Flared connection  
Flared connection  
Indoor coil  
Indoor coil  
thermistor  
RT13(sub)  
thermistor  
RT13(sub)  
Room temperature  
thermistor  
Room temperature  
thermistor  
RT11  
RT11  
Flared connection  
Flared connection  
Refrigerant pipe [6.35  
(with heat insulator)  
Refrigerant pipe [6.35  
(with heat insulator)  
Refrigerant flow in cooling  
Refrigerant flow in heating  
8
8
SERVICE FUNCTIONS  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
8-1. TIMER SHORT MODE  
For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board.  
The time will be shortened as follows. (Refer to 9-7.)  
Set time : 1-minute 1-second  
Set time : 3-minute 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is  
shortened by short circuit of JPG and JPS.)  
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION  
A maximum of 4 indoor units with wireless remote controllers can be used in a room.  
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be  
modified according to the number of the indoor unit.  
How to modify the remote controller P.C. board  
Remove batteries before modification.  
The board has a print as shown below :  
Remote controller model : KM05A  
NOTE : For remodelling, take out  
the batteries and press the  
OPERATE/STOP(ON/OFF)  
button twice or 3 times at  
first.  
After finish remodelling,  
put back the batteries then  
press the RESET button.  
J1  
J2  
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.  
After modification, press the RESET button.  
Table 1  
4 units operation  
Same as at left  
1 unit operation  
2 units operation  
3 units operation  
Same as at left  
Same as at left  
Solder J2  
No. 1 unit  
No. 2 unit  
No. 3 unit  
No. 4 unit  
No modification  
Same as at left  
Same as at left  
Solder J1  
Same as at left  
Solder both J1 and J2  
How to set the remote controller exclusively for particular indoor unit.  
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote  
controller for the indoor unit.  
The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they are  
set.  
The setting will be cancelled if the breaker has turned off, or the power supply has shut down.  
Please conduct the above setting once again after the power has restored.  
8-3. AUTO RESTART FUNCTION  
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed  
are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment  
power has restored after power failure. Then, the unit will restart automatically.  
Operation  
1 If the main power has been cut, the operation settings remain.  
2 After the power is restored, the unit restarts automatically according to the memory.  
(However, it takes at least 3 minutes for the compressor to start running.)  
9
How to release “AUTO RESTART FUNCTION”  
1Turn off the main power for the unit.  
2Solder the Jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)  
JR07  
NOTE:  
The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote  
controller.  
If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is  
cancelled.  
If the unit has been off with the remote controller before power failure, the auto restart function does not works as the  
power button of the remote controller is off.  
To prevent breaker off due to the rush of starting current, systematize other home appliance not to turn on at the same  
time.  
When some air conditioners are connected to the same supply system, if they are operated before power failure, the  
starting current of all the compressors may flow simultaneously at restart.  
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current  
by adding to the system that allows the units to start one by one.  
8-4. Remote controller  
Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the  
installed position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.  
Side swich  
Area  
Left  
Center  
Right  
Position of  
the slide  
switch  
Display on  
the remote  
controller  
Where is the indoor unit installed in your room?  
Installed at left , if the  
distance is not more  
than 50 cm.  
Installed at right , if the  
distance is not more  
than 50 cm.  
(Left)  
(Center)  
(Right)  
Is the indoor unit in-  
stalled at right, left or  
center?  
NOTE:If the indoor unit is installed more than 50 cm away from the side walls, cabinets or other nearby objects, set the slide  
switch to the “center” position.  
10  
9
TROUBLESHOOTING  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
9-1. Cautions on troubleshooting  
1. Before troubleshooting, check the following:  
1) Check the power supply voltage.  
2) Check the indoor/outdoor connecting wire for mis-wiring.  
2. Take care the following during servicing.  
1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after  
confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.  
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the  
electronic control P.C. board.  
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the  
components.  
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.  
Lead wiring  
Housing point  
3. Troubleshooting procedure  
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.  
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.  
2) Before servicing check that the connector and terminal are connected properly.  
3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the  
components for bursting and discoloration.  
4) When troubleshooting, refer to 9-2., 9-3. and 9-4.  
4. How to replace batteries  
Weak batteries may cause the remote controller malfunction.  
In this case, replace the batteries to operate the remote controller normally.  
1 Remove the front lid and insert batteries.  
2 Press RESET button with tip end of ball point pen  
Then reattach the front lid.  
or the like, and then use the remote controller.  
Insert the negative pole of the  
batteries first. Check if the polarity  
of the batteries are correct.  
RESET button  
NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.  
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.  
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by  
the battery replacement.  
5. How to install the horizontal vane  
If horizontal vane is not installed correctly, All of the operation indicator lamps will blink.  
In this case, install the horizontal vane correctly by following the procedures 1 to 2.  
NOTE: Before installation of the horizontal vane, turn OFF the power supply.  
Stopper  
1
2
In procedure 2 lock the  
stoppers until they click  
into place.  
Left  
Lock.  
Insert this end first.  
11  
6. How to remove and install PLASMA DEODORIZING / AIR PURIFYING filter units  
If PLASMA/WASH lamp on the indoor unit blinks, clean the filters as soon as possible. The lamp will start blinking when  
accumulated operating time exceeds 330 hours.  
Figure 1.  
<Remove>  
(1) Switch the indoor unit OFF with the remote controller and  
disconnect the power supply plug and/ or turn OFF the  
breaker.  
NOTE: Otherwise, you may get injured since PLASMA  
DEODORIZING/AIR PURIFYING filter units are  
charged with high voltage.  
(2) Hold the knobs on both sides of the front panel and lift the  
panel up until its level.  
(3) Remove the anti-mold air filter.(See Figure 1.)  
(4) Remove PLASMA DEODORIZING/AIR PURIFYING filter  
units. (See Figure 2.)  
Figure 2.  
<Install>  
Install PLASMA DEODORIZING/AIR PURIFYING filter units by following the removal procedure in reverse.  
(1) Insert the top of PLASMA DEODORIZING/AIR PURIFYING filter  
Figure 3.  
units into the aperture in the plasma element holder.  
(See Figure 3.)  
(2) Push in PLASMA DEODORIZING/AIR PURIFYING filter units  
until they click into place.  
•The front panel does not close if PLASMA DEODORIZING/AIR  
PURIFYING filter units are not installed properly.  
(3) Install the anti-mold air filter.  
(4) Connect the power supply plug and/ or turn ON the breaker.  
Plasma  
element  
holder  
(5) Press WASH reset switch. A short “beep” is heard and the blinks  
of PLASMA/WASH lamp will be cancelled. Make sure PLASMA/  
WASH lamp is not blinking at the start of operation next time.  
(See Figure 4.)  
(6) Hold both sides of the front panel and close the front panel.  
(7) Press the 3 positions on the front panel as indicated by the  
arrows.(See Figure 5.)  
Figure 4.  
E.O.  
SW  
NOTE:  
WASH  
reset  
Install PLASMA DEODORIZING/AIR PURIFYING filter units only  
when they are completely dry. If the filter unit remains wet,  
PLASMA/WASH lamp may blink and the plasma function may be  
disabled.(When PLASMA DEODORIZING/AIR PURIFYING filter  
units are cleaned.)  
Figure 5.  
12  
INFORMATION FOR MULTI SYSTEM AIR CONDITIONER  
OUTDOOR UNIT : MXZ series  
Multi system air conditioner can connect two or more indoor units with one outdoor unit.  
•Unit won’t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not  
connect indoor units beyond the outdoor unit capacity.  
Operation indicator lamp flashes as shown in the figure below.  
•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and  
the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor  
units which start the operation later cannot operate, indicating as shown in the figure below. In this case,  
please set all the indoor units to the same operation mode.  
Lighted  
Blinking  
Not lighted  
•When indoor units start the operation while the defrosting of outdoor unit is being done, it takes a few minutes  
(max. 10 minutes) to blow out the warm air.  
•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant  
flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.  
13  
9-2. Failure mode recall function  
Outline of the function  
This air conditioner can memorize the abnormal condition which has occurred once.  
Even though LED indication listed on the troubleshooting check table disappears, the memorized failure details can be  
recalled.  
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.  
1. Flow chart of the indoor/outdoor unit failure mode recall function  
Operational procedure  
1While pressing both OPERATION SELECT  
button and TOO COOL button on the  
remote controller at the same time,  
The cause of abnormality cannot be found because the abnormality doesn't recur.  
Setting up the failure mode recall function  
press RESET button.  
Turn ON the power supply.  
2First, release RESET button.  
1While pressing both OPERATION SELECT  
button and TOO COOL button on the remote controller at the same  
time, press RESET button.  
And release the other two buttons since all LCD  
in operation display section of the remote controller  
is displayed after 3 seconds.  
2First, release RESET button.  
And release the other two buttons since all LCD in operation display  
section of the remote controller is displayed after 3 seconds.  
W1. Regardless of normal or abnormal, a short  
W1  
beep is emitted once as the signal is received.  
Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature  
is displayed).  
With the remote controller headed towards the indoor unit, press TOO COOL or TOO  
WARM button to adjust the set temperature to 24:.  
No  
(OFF)  
Does POWER lamp on the indoor  
Indoor unit is normal.  
unit blink at the interval of 0.5 seconds?  
Blinks: Either indoor or outdoor unit is abnormal.  
Beep sounds are emitted at the same timing  
of the blinking of POWER lamp. W2  
There is a possibility that the plasma or outdoor unit is abnormal.  
Confirm the presence of abnormality according to the flow chart of the  
the prasma unit or detailed outdoor unit failure mode recall function.  
Yes  
(Blinks)  
Judgment of indoor/outdoor abnormality  
Before blinking, does POWER  
lamp stay ON for 3 seconds?  
Yes  
Stays ON for 3 seconds (without beep):  
The outdoor unit is abnormal.  
No  
The indoor unit is abnormal.  
The outdoor unit is abnormal.  
Check the blinking pattern, and refer to confirm the  
abnormal point(9-2.4.).  
Check the blinking pattern, and refer to confirm the abnormal point.  
Make sure to check at least two consecutive blinking cycles. W3  
Make sure to check at least two consecutive blinking cycles. W2  
Releasing the failure mode recall function  
Release the failure mode recall function by the following procedures.  
1With the remote controller headed towards the indoor unit, press any button  
that is not used in this failure mode recall function (e.g. TIMER button) .  
OR  
1Turn OFF the power supply and turn ON it again.  
2Press RESET button of the remote controller.  
•As for outdoor unit MUZ type, refer to service manual OB372.  
As for outdoor unit MXZ type, refer to service manual OB377.  
Repair the defective parts.  
Deleting the abnormal condition  
1After repairing the unit, recall the failure mode again according to  
"Setting up the failure mode recall function" mentioned above.  
2Press EMERGENCY OPERATION switch so that the memorized  
abnormal condition is deleted.  
3Release the failure mode recall function according to "Releasing the  
failure mode recall function" mentioned above.  
Note1.Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.  
2.If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.  
W2. Blinking pattern when the indoor unit is abnormal:  
Blinking at 0.5-  
second interval  
Blinking at 0.5-  
second interval  
2.5-second OFF  
2.5-second OFF  
ON  
OFF  
Beeps  
Beeps  
Beeps  
Repeated cycle  
Repeated cycle  
Repeated cycle  
W3.Blinking pattern when the outdoor unit is abnormal:  
Blinking at 0.5-  
Blinking at 0.5-  
second interval  
2.5-second OFF  
3-second ON  
second interval  
2.5-second OFF  
3-second ON  
ON  
OFF  
No beep  
Beeps  
No beep  
Beeps  
Repeated cycle  
Repeated cycle  
Repeated cycle  
14  
2. Flow chart of PLASMA DEODORIZING/PLASMA AIR PURIFYING power failure mode recall function  
Operational procedure  
There is a possibility that the plasma unit is abnormal.  
Confirm the presence of abnormality according to the following procedures.  
Confirm that the remote controller is in the failure mode recall  
function.  
W1. Regardless of normal or abnormal, a short  
beep is emitted as the signal is received.  
W1  
With the remote controller headed towards the indoor unit, press TOO COOL or TOO  
WARM button to adjust the set temperature to 23:.  
Confirmation of abnormality presence  
Does POWER lamp on the indoor  
No  
unit blink at the interval of 0.5 seconds? W2  
Blinks: The plasma unit is abnormal.  
Beep sounds are emitted at the same timing  
of the blinking of POWER lamp.  
(OFF)  
Yes  
(Blinks)  
The plasma unit is abnormal.  
Check the blinking pattern, and refer to confirm the  
abnormal point(9-2.5.).  
The plasma unit is normal.  
Make sure to check at least two consecutive blinking cycles. W2  
Releasing the failure mode recall function  
Release the failure mode recall function by the following procedures.  
1With the remote controller headed towards the indoor unit, press any button  
that is not used in this failure mode recall function (e.g. TIMER button) .  
OR  
Release the failure mode recall function according to the left  
mentioned procedure.  
1Turn OFF the power supply and turn ON it again.  
2Press RESET button of the remote controller.  
Repair the defective parts.  
Deleting the abnormal condition  
1After repairing the unit, recall the failure mode again according to  
"Setting up the failure mode recall function" mentioned above.  
2Press EMERGENCY OPERATION switch so that the memorized  
abnormal condition is deleted.  
3Release the failure mode recall function according to "Releasing the  
failure mode recall function" mentioned above.  
Note1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.  
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.  
W2.Blinking pattern when outdoor unit is abnormal:  
Blinking at 0.5-  
second interval  
Blinking at 0.5-  
second interval  
2.5-second OFF  
2.5-second OFF  
ON  
OFF  
Beeps  
Beeps  
Beeps  
Repeated cycle  
Repeated cycle  
Repeated cycle  
3. PLASMA DEODORIZING/PLASMA AIR PURIFYING power operation check  
PLASMA DEODORIZING/PLASMA AIR PURIFYING power goes ON when PLASMA button on the remote controller is pressed  
once while the indoor error indication is being checked or after one short beep sound (signal reception beep) is emitted.  
PLASMA button is pressed, the power of plasma is changed in sequence:  
PLASMA DEODORIZING power goes ON  
PLASMA AIR PURIFYING power goes ON  
Cancel  
Check the operation display section of the remote controller to confirm that PLASMA DEODORIZING power or PLASMA AIR  
PURIFYING power is activated.  
While PLASMA/WASH lamp stays OFF, and it means normal.  
Flashing PLASMA/WASH lamp means abnormal, and the plasma power is not being conducted.  
PLASMA/WASH lamp  
Continuously flashes  
Action  
Follow "Check of PLASMA DEODORIZING power" or "Check of PLASMA AIR PURIFYING power"  
to identify the error.(Refer to 9-6.For G.)  
PLASMA DEODORIZING power or PLASMA AIR PURIFYING power control circuit on the indoor  
electronic control P.C. board is out of order.(Refer to 9-6.For G.)  
2-time flash  
NOTE: Perform the above mentioned check with the front panel closed. Panel open is detected by the SAFETY DEVICE  
(PLASMA UNIT).  
15  
4. Indoor unit failure mode table  
NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.).  
Abnormal point  
(Failure mode)  
POWER lamp  
Not lighted  
Detection method  
Check point  
Normal  
When the room temperature thermistor short  
or open circuit is detected every 8  
seconds during operation.  
Room temperature  
thermistor  
Refer to the characteristics of the room  
temperature thermistor (9-7.).  
1-time flash  
every 0.5-second  
When the indoor coil thermistor short or open Refer to the characteristic of the main  
2-time flash  
2.5-second OFF  
circuit is detected every 8 seconds during  
operation.  
indoor coil thermistor, the sub indoor coil  
thermistor (9-7.).  
Indoor coil thermistor  
Serial signal error  
Indoor fan motor  
3-time flash  
2.5-second OFF  
When the serial signal from outdoor unit is  
not received for a maximum of 6 minutes.  
Refer to 9-6.D"How to check miswiring  
and serial signal error".  
When the rotational frequency feedback  
signal is not emit during 12-second the  
indoor fan operation.  
Refer to 9-6.A"Check of indoor fan  
motor".  
11-time flash  
2.5-second OFF  
When it cannot properly read data in the  
nonvolatile memory of the indoor electronic  
control P.C. board.  
Replace the indoor electronic control  
P.C. board.  
12-time flash  
2.5-second OFF  
Indoor control system  
5. PLASMA DEODORIZING/PLASMA AIR PURIFYING power failure mode table  
Abnormal point  
(Failure mode)  
POWER lamp  
1-time flash  
Detection method  
Check point  
When PLASMA DEODORIZING/PLASMA  
AIR PURIFYING power cannot be turned  
OFF.  
PLASMA DEODORIZING/  
PLASMA AIR PURIFYING  
power control  
Replace the indoor electronic control P.C.  
board.  
When the voltage between CN1 1(+)  
and 2(GND) on the PLASMA POWER P.C.  
board (PLASMA DEODORIZING or PLASMA  
AIR PURIFYING) falls below 1.6V(spark  
discharge judgment voltage).  
Refer to 9-6.F"Check of PLASMA  
DEODORIZING power" or 9-6.G"Check  
of PLASMA AIR PURIFYING power".  
2-time flash  
3-time flash  
4-time flash  
5-time flash  
Spark discharge  
When the voltage between CN1 1(+)  
and 2(GND) on the PLASMA POWER P.C.  
board (PLASMA DEODORIZING or PLASMA  
AIR PURIFYING) falls 0.9V below the normal  
range voltage.  
Refer to 9-6.F"Check of PLASMA  
DEODORIZING power" or 9-6.G"Check  
of PLASMA AIR PURIFYING power".  
Abnormal electric  
discharge error 1  
When the voltage between CN1 1(+)  
and 2(GND) on the PLASMA POWER P.C.  
board (PLASMA DEODORIZING or PLASMA  
AIR PURIFYING) falls significantly.  
(0.4V / 0.5ms)  
Refer to 9-6.F"Check of PLASMA  
DEODORIZING power" or 9-6.G"Check  
of PLASMA AIR PURIFYING power".  
Abnormal electric  
discharge error 2  
When the voltage between CN1 1(+)  
and 2(GND) on the PLASMA POWER P.C.  
board (PLASMA DEODORIZING or PLASMA  
AIR PURIFYING) rises above the normal  
voltage value (3V).  
Refer to 9-6.F"Check of PLASMA  
DEODORIZING power" or 9-6.G"Check  
of PLASMA AIR PURIFYING power".  
PLASMA DEODORIZING/  
PLASMA AIR PURIFYING  
power  
w As soon as an error is detected, PLASMA DEODORIZING power or PLASMA AIR PURIFYING power goes OFF,  
therefore measuring instrument which records the voltage wave is required in order to perform the above men-  
tioned voltage measurement.  
16  
9-3. Instruction of troubleshooting  
w"Test Run operation"  
means the operation  
within 30 minutes after  
EMERGNCY OPERATION with failure mode recall function.  
switch is pressed.  
If blinking of OPERATION  
INDICATOR lamp cannot  
be checked, it can be checked  
Start  
OPERATION  
OPERATION  
Indoor unit  
Indoor unit  
Indoor unit operates.  
Outdoor unit doesn't  
operate normally.  
INDICATOR  
INDICATOR  
operates.  
Outdoor unit  
doesn't  
doesn't receive  
the signal from  
remote controller.  
lamp on the  
indoor unit is  
flashing on  
and off.  
lamp on the  
indoor unit  
stays off.  
operate.  
PLASMA/WASH lamp  
2-time flash  
cause:  
Indoor unit  
doesn't operate,  
when  
EMERGENCY  
OPERATION  
switch is pressed.  
Indoor unit  
Outdoor unit  
doesn't  
operate  
even in  
Test Run  
operation. w  
Unit doesn't  
operate  
normal  
operation in  
COOL or  
HEAT mode.  
Outdoor unit  
operates in  
only Test Run  
operation. w  
operates, when  
EMERGENCY  
OPERATION  
switch is pressed.  
Indoor unit  
• Trouble of PLASMA  
DEODORIZNG power  
control or PLASMA AIR  
PURIFYING power  
control  
1. Check indoor / outdoor  
connecting wire.  
(Check if the power  
is supplied to the  
indoor unit.)  
2. Refer to 9-6.C  
"Check of indoor  
electronic control  
P.C. board and indoor  
fan motor".  
Replace the indoor  
electronic control P.C.  
board.  
Refer to  
"How to check  
inverter/  
Check room  
temperature  
thermistor.  
Refer to 9-7.  
"Test point  
diagram and  
voltage".  
Refer to  
"Check of  
R.V. coil".  
Refer to 9-6.B  
"Check of  
remote controller  
and receiver  
P.C. board".  
compressor".  
As for outdoor unit MUZ type,  
refer to service manual OB372.  
As for outdoor unit MXZ type,  
refer to service manual OB377.  
POWER lamp  
2-time flash  
Cause:  
Indoor unit  
• Trouble of  
room temp-  
erature/  
indoor coil  
thermistor  
POWER lamp  
Flash on and off  
at 0.5-second  
intervals  
Cause:  
Indoor/  
Outdoor unit  
• Mis-wiring  
or trouble  
POWER lamp POWER lamp  
POWER lamp  
3-time flash  
Cause:  
Indoor unit  
• Trouble of  
indoor fan  
motor  
Left lamp  
POWER lamp POWER lamp  
All lamps  
7-time flash  
Cause:  
14-time flash  
Cause:  
of AREA lamp  
4-time flash  
Cause:  
Indoor unit  
• Trouble of  
indoor unit  
control  
5-time flash  
Cause:  
6-time flash  
Cause:  
Flash on and off  
at 0.5-second  
intervals  
Outdoor unit Outdoor unit  
Outdoor unit  
• Outdoor  
power  
system  
abnormality  
Outdoor unit  
• Trouble of  
thermistor  
in outdoor  
unit  
Cause:  
• Trouble of  
outdoor  
control  
• Other  
abnormality  
Indoor unit  
• The horizontal  
vane is not  
installed  
system  
correctly.  
system  
of serial signal  
Refer to  
"How to check  
inverter/  
Refer to 9-6.  
A"Check of  
indoor fan  
motor".  
Check  
Replace the  
indoor  
electronic  
control  
Refer to  
"Check of  
outdoor  
thermistors". the outdoor  
electronic  
Replace the  
inverter P.C.  
board or  
Check room  
temperature  
thermistor  
and indoor  
coil thermis-  
tor.  
Refer to 9-7.  
"Test point  
diagram and  
voltage".  
Refer to 9-6. Refer to 9-6.  
E "Check of D "How to  
installation of check of  
the horizontal mis-wiring  
"Flow chart of  
the detailed  
outdoor unit  
failure mode  
recall function."  
compressor".  
P.C. board.  
vane".  
and serial  
signal error  
(when  
control P.C.  
board.  
outdoor unit  
doesn't work)".  
17  
9-4. Troubleshooting check table  
· Flashing of POWER lamp indicates abnormalities.  
Lighted  
Blinking  
Not lighted  
NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting.  
Self check table  
Abnormal  
point  
No.  
1
Operation indicator lamp  
POWER lamp flashes.  
Symptom  
Detection method  
Check point  
0.5-second ON  
• Refer to 9-6.D"How to check  
mis-wiring and serial signal  
error".  
Mis-Wiring  
or serial  
signal  
Outdoor unit  
does not  
operate.  
When the serial signal form the outdoor unit is  
not received for a maximum of 6 minutes.  
0.5-second OFF  
• Check the blinking pattern of  
the LED on the inverter P.C.  
board or the outdoor lectronic  
control P.C. board.  
When it cannot properly read data in the  
nonvolatile memory of the inverter P.C. board  
or the outdoor electronic control P.C. board.  
Outdoor  
control  
system  
Outdoor unit  
does not  
operate.  
POWER lamp lights up  
2
3
Indoor coil  
thermistor  
POWER lamp flashes.  
2-time flash  
Indoor unit  
and outdoor  
unit do not  
operate.  
• Refer to 9-7.the  
When the indoor coil or the room temperature  
thermistor is short or open circuit.  
characteristics of indoor coil  
thermistor, and the room  
temperature thermistor.  
Room  
tempera-  
ture  
2.5-second OFF  
thermistor  
POWER lamp flashes.  
3-time flash  
Indoor unit  
and outdoor  
unit do not  
operate.  
When the rotational frequency feedback  
signal is not emit during the indoor fan  
operation.  
• Refer to 9-7.A"Check of  
indoor fan motor".  
Indoor fan  
motor  
4
5
6
2.5-second OFF  
POWER lamp flashes.  
5-time flash  
• Refer to "Check of inverter/  
compressor".  
Refer to service manual  
OB372 or OB377.  
Indoor unit  
and outdoor  
unit do not  
operate.  
When it consecutively occurs 3 times that the  
compressor stops for overcurrent protection or  
start-up failure protection witth in 1 minute  
after start-up.  
Outdoor  
power  
system  
Check the stop valve.  
2.5-second OFF  
POWER lamp flashes.  
6-time flash  
Indoor unit  
and outdoor  
unit do not  
operate.  
• Refer to "Check of outdoor  
thermistor".  
Refer to service manual  
OB372 or OB377.  
When the outdoor thermistors short or open  
circuit during the compressor operation.  
Outdoor  
thermistors  
2.5-second OFF  
2.5-second OFF  
POWER lamp flashes.  
7-time flash  
• Replace the inverter P.C.  
board or the outdoor  
electronic control P.C. board.  
Refer to service manual  
OB372 or OB377.  
Indoor unit  
and outdoor  
unit do not  
operate.  
Outdoor  
control  
system  
When it cannot properly read data in the  
nonvolatile memory of the inverter P.C. board  
or the outdoor electronic control P.C. board.  
7
8
POWER lamp flashes.  
14-time flash  
Indoor unit  
and outdoor  
unit do not  
operate.  
• Confirm the abnormarity in  
detail using the failure mode  
recall function.  
An abnormality other than above mentioned is  
deteced.  
Other  
abnonmality  
2.5-second OFF  
NOTE : When the indoor unit has started operation and the above detection method has detected an abnormality (the first  
detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with  
OPERATION INDICATOR lamp flashing.  
18  
· Flashing of AREA lamp(left-hand side lamp) indicates abnormality.  
Lighted  
Blinking  
Not lighted  
NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting.  
Self check table  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Detection method  
Check point  
Left lamp of AREA lamp flashes.  
4-time flash  
Indoor unit  
and outdoor  
unit do not  
operate.  
Indoor  
control  
system  
When it cannot properly read data in the  
nonvolatile memory of the indoor electronic  
control P.C. board.  
• Replace the indoor electronic  
control P.C. board.  
2.5-second OFF  
· Flashing of All lamps indicate abnormality.  
Lighted  
Blinking  
Not lighted  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Detection method  
Check point  
All lamps flash at the same time.  
0.5-second ON  
Attachment  
of the  
horizontal  
vane  
Indoor unit  
and outdoor  
unit do not  
operate.  
• Refer to 9-6.E"Check of  
installation of the horizontal  
vane".  
When the electricity is not conducted to the  
interlock switch (Fan) of the horizontal vane.  
0.5-second OFF  
· Flashing of AREA lamp(both lamps) indicates abnormality.  
· POWER lamp is lighted.  
Lighted  
Blinking  
Not lighted  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Detection method  
Check point  
Both lamps flash  
When the operation mode of the each indoor  
unit is differently set to COOL(includes DRY)  
and HEAT at the same time, the operation  
mode of the indoor unit that has operated at  
first has the priority.  
Outdoor unit  
operates but  
indoor unit  
does not  
MXZ type  
Operation  
mode  
• Unify the operation mode.  
Refer to service manual  
OB377.  
2.5-second OFF  
setting  
operate.  
· Flashing of PLASMA/WASH lamp indicates abnormality.  
Lighted  
Blinking  
Not lighted  
Abnormal  
point  
No.  
1
Operation indicator lamp  
Symptom  
Detection method  
Check point  
PLASMA  
DEODORIZING/  
PLASMA  
AIR  
PURIFYING  
power control  
PLASMA/WASH lamp flashes.  
2-time flash  
Indoor unit  
and outdoor  
unit do not  
operate.  
When PLASMA DEODORIZING power or  
PLASMA AIR PURIFYING power can not be  
turned OFF.  
• Replace the indoor electronic  
control P.C. board.  
2.5-second OFF  
NOTE : When the indoor unit has started operation and the above detection method has detected an abnormality (the first  
detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with  
OPERATION INDICATOR lamp flashing.  
19  
9-5. Trouble criterion of main parts  
E1  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
Part name  
Check method and criterion  
Measure the resistance with a tester. (Part temperature 10˚C ~ 30˚C)  
Figure  
Room temperature  
thermistor(RT11)  
Normal  
Abnormal  
Indoor coil thermistor  
(RT12(MAIN), RT13(SUB))  
Open or short-circuit  
8 k"~ 20 k"  
Indoor fan motor(MF)  
Check 9-6. A.  
RED  
Measure the resistance between the terminals with a tester.  
ROTOR  
(Part temperature 10°C ~ 30°C)  
Horizontal vane  
motor(MV1)  
YLW  
BRN  
Abnormal  
Color of the lead wire  
BRN-other one  
Normal  
Open or short-circuit  
235 "~ 255 "  
GRN  
ORN  
ORN  
ORN  
RED  
Measure the resistance between the terminals with a tester.  
Vertical vane  
motor(MV2)  
i-see Sensor  
motor(MT)  
ROTOR  
(Part temperature 10°C ~ 30°C)  
YLW  
BRN  
Abnormal  
Color of the lead wire  
BRN-other one  
Normal  
Open or short-circuit  
282 "~ 306 "  
GRN  
RED  
Measure the resistance between the terminals with a tester.  
ROTOR  
Front panel  
driving motor  
(MP)  
(Part temperature 10°C ~ 30°C)  
YLW  
BRN  
Abnormal  
Color of the lead wire  
BRN-other one  
Normal  
Open or short-circuit  
94 "~ 102 "  
GRN  
Turn the power ON(i-see Sensor is energized) with the aluminum block part  
on the i-see Sensor P.C. board (upper part of i-see Sensor) covered with black  
vinyl tape, then measure the voltage between connector terminals of i-see  
Sensor using tester.  
(Part temperature 10 ~ 40°C)  
wThe aluminum block  
part is covered with  
black vinyl tape.  
i-see Sensor  
Aluminum block  
i-see Sensor(RR)  
Black  
Connector i-see Sensor P.C. board  
vinyl tape  
i-see Sensor  
connector terminals  
Normal range  
Abnormal  
Below 1.874 or above 3.387V DC  
Below 1.010 or above 1.420V DC  
2(-)  
1(+)  
-
-
4(+)  
2(-)  
1.874 ~ 3.387V DC  
1.010 ~ 1.420V DC  
NOTE: Pay attention to static electricity.  
PLASMA DEODORIZING/  
PLASMA AIR PURIFYING  
power  
Check 9-6. For G.  
20  
9-6. Troubleshooting flow  
When POWER lamp flashes 3-time.  
Indoor fan does not operate.  
A
Check of indoor fan motor  
The indoor fan motor error has occurred, and the indoor fan doesn't operate.  
Turn OFF the power supply.  
Insert a stick such as a screw driver  
into the air outlet, and check if there is  
any catch in the rotation of the line  
Pay careful attention to the high voltage on  
the fan motor connector CN211.  
flow fan.  
w
Turn ON the power supply, wait 5 seconds or more, and then press  
EMERGENCY OPERATION switch.  
Measure the supply voltage as follows within 12 seconds  
after EMERGENCY OPERATION switch is pressed.  
If more than 12 seconds passes by, turn OFF the power supply and  
turn ON it again, then measure the voltage.  
Is there any foreign matter that  
interferes the rotation of the  
line flow fan?  
No  
1.Measure the voltage between CN211 1(+) and 3(-).  
2.Measure the voltage between CN211 5(+) and 3(-).  
Yes  
wIf 12 seconds or more passes after EMERGENCY OPERATION switch  
is pressed, the voltage mentioned above 2 goes 0V DC although the  
indoor electric control P.C. board is normal.  
Adjust the line flow fan and  
remove the foreign matter.  
Is there 311V DC between  
CN211 1(+) and 3(-), and does  
the voltage between CN211 5(+)  
and 3(-) rise to the range of 3 to 6V  
DC within 12 seconds after  
EMERGENCY OPERATION switch  
is pressed?  
CN211  
Indoor electronic  
control P.C. board  
Yes  
Replace the indoor fan motor.  
No  
Replace the indoor electronic control P.C. board.  
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.  
Measure the voltage between CN211  
6(+) and 3(-) while the fan  
motor is rotating.  
Changed  
Is it unchanged holding  
0V DC or 15V DC?  
Replace the indoor electronic control P.C. board.  
Unchanged  
Replace the indoor fan motor.  
21  
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.  
B Check of remote controller and receiver P.C. board  
wCheck if the remote controller is exclusive for this air conditioner.  
Switch on the remote controller.  
No  
Is LCD display on the the remote  
Replace the batteries. (Refer to 9-1.4.)  
controller visible?  
(not clear)  
Yes  
Remove the batteries, then set them back  
and press RESET button. (Refer to 9-1.4.)  
Check if the unit operates with the remote  
controller.  
No  
Turn on a radio to AM and press switch on  
the remote controller.  
Does the unit operate with the  
remote controller?  
Yes  
OK  
No  
Replace the remote controller.  
Is noise heard from radio?  
Yes  
Are there any fluorescent lights of  
inverter or rapid-start type within  
the range of 1m?  
Yes  
Reinstall the unit away from lights.  
Attach a filter on receiving part.  
Replace the indoor electronic  
control P.C. board.  
22  
The unit does not operate with the remote controller.  
Also, POWER lamp does not light up by pressing EMERGENCY OPERATION switch.  
C Check of indoor electronic control P.C. board and indoor fan motor  
Short circuit:  
Turn OFF the power supply.  
Measure the resistance of the front panel  
driving motor coil.  
Normal value is approx. 100'  
Replace the front panel driving motor  
and the indoor electronic control P.C.  
board.  
Remove indoor fan motor connector CN211, vane motor  
connector CN151 front panel driving motor connector  
connector CN1U1 and i-see Sensor motor connector  
CN110 from the indoor electronic  
control P.C. board and turn ON the power supply.  
Short circuit:  
Replace i-see Sensor motor and the  
indoor electronic control P.C. board.  
Measure the resistance of i-see Sensor  
motor coil.  
Normal value is approx. 300'  
Yes  
Does the unit operate with the remote controller?  
Does POWER lamp light up by pressing EMERGENCY  
OPERATION switch?  
Measure the resistance between CN211 3  
and 4of the indoor fan motor connector.  
Normal value is approx. 30k'to 50k'.  
Short circuit:  
Replace the indoor fan motor.  
No  
Short circuit:  
Measure the resistance of the horizontal vane  
motor coil and the vertical vane motor coil.  
Normal value is approx. 300'or 250'.  
Replace the horizontal vane motor, the  
vertical vane motor and the indoor  
electronic control P.C. board.  
Replace the varistor(NR11) and fuse(F11).  
Yes  
No  
Are the varistor(NR11) burnt  
and the fuse(F11) blown?  
Turn OFF the power supply.  
Check both “parts side” and “pattern  
side” of the indoor electronic control P.C.  
board visually.  
Be sure to check both the fuse  
and the varistor in any case.  
No  
Is the fuse(F11) blown only?  
w1,2  
Yes  
Measure the resistance between  
1(+) and 3(-) of the indoor fan  
w1. The fan motor connector's 1lead wire is red, whereas 3is black.  
motor connector (to CN211 on the  
indoor electronic control P.C. board) .  
w2. Connect "+" of the tester to fan motor connector's 1lead  
wire, and "-" to 3lead wire, otherwise the resistance cannot be  
measured properly.  
w3  
w3. Short circuit:  
No  
Is the resistance 1M'  
or more?  
Replace the fuse (F11) and the indoor fan motor.  
The indoor fan motor is  
abnormal.  
Yes  
Replace the fuse (F11).  
No  
Is the resistance  
approx. 4'?  
Measure the cement resistance R111 on  
the indoor electronic control P.C. board.  
Replace the indoor electronic control P.C. board  
and the indoor fan motor.  
Yes  
Indoor electronic  
control P.C.Board  
Replace the indoor electronic control P.C. board.  
CN211  
Varistor(NR11)  
CN201  
Fuse(F11)  
23  
When POWER lamp flashes ON and OFF in every 0.5-second.  
Outdoor unit does not operate.  
D
How to check mis-wiring and serial signal error  
Turn OFF the power supply.  
Is there rated voltage of  
230V AC in the power  
supply?  
No  
No  
Check the power  
supply.  
Yes  
Turn ON the power supply.  
Is there 230V AC between  
outdoor terminal block S1 and  
S2?  
Check the wiring.  
Yes  
Press EMERGENCY OPERATION switch.  
Does POWER lamp light up?  
<Confirmation of the power to the indoor unit>  
No  
Yes  
Is there any mis-wiring,  
poor contact, or wire  
disconnection of the  
indoor/outdoor  
No  
Yes  
Is the self-check of the indoor unit displayed 6  
minutes after?  
Make them sure.  
connecting wire?  
Yes  
Serial signal error display  
No  
POWER lamp  
blinks quickly.  
A
Turn OFF the power supply.  
Check once more if the indoor/outdoor  
connecting wire is not mis-wiring.  
B
Short-circuit outdoor terminal block S2 and  
W1. Mis-wiring may damage indoor electronic control  
P.C. board during the operation.  
S3.  
W1  
Be sure to confirm the wiring is correct before the  
operation starts.  
Turn ON the power supply of the outdoor unit.  
In 3 minutes after turning ON the  
power supply of the outdoor unit, does  
the LED on the inverter P.C. board  
repeat quick blinking "3.6-second-OFF  
and 0.8-second-ON"?  
Be sure to check above in 3 minutes  
after turning ON. After 3 minutes, LED  
blinks 6 times. When the inverter P.C.  
board is normal, LED also blinks 6  
times after 3 minutes.  
Inverter P.C.board  
(Parts side)  
Replace the inverter  
P.C. board.  
W2  
No  
(Lighting)  
W2 Be careful to the residual  
LED  
voltage of smoothing capacitor.  
Blinking  
Yes  
A
Remove the short-circuit between  
outdoor terminal block S2 and S3.  
Is there amplitude of 10 to 20V DC  
between outdoor terminal block S2  
and S3? <Confirmation of serial  
signal>  
Is there any error of the  
· Turn OFF inverter-controlled lighting  
equipment.  
· Turn OFF the power supply and then  
turn ON again.  
· Press EMERGENCY OPERATION  
switch.  
Replace the  
indoor/outdoor  
connecting.  
indoor/outdoor connecting wire,  
such as the damage of the wire,  
intermediate connection, poor  
contact to the terminal block?  
Yes  
Yes  
No  
No  
No  
Yes  
· Reinstall  
either the  
unit or the  
light each  
other away.  
· Attach a filter  
on receiving  
section of  
the indoor  
unit.  
Is there any error of the  
Is there 230V AC between outdoor  
terminal block S1 and S2?  
<Confirmation of power voltage>  
indoor/outdoor connecting wire,  
such as the damage of the wire,  
intermediate connection, poor  
contact to the terminal block?  
Replace the  
indoor/outdoor  
connecting.  
Is serial signal  
error indicated  
6 minutes later?  
No  
Yes  
Replace the indoor electronic control P.C. board.  
Be sure to release the failure-mode  
recall function after checking.  
Yes  
B
As for outdoor unit MUZ type,refer to service manual OB372.  
As for outdoor unit MXZ type,refer to service manual OB377.  
24  
When All lamps flash ON and OFF every 0.5-second.  
Indoor unit and outdoor unit do not operate.  
Check of installation of the horizontal vane  
E
Start  
Turn OFF the  
power supply.  
No  
Relock the stopper of the  
horizontal vane to the indoor unit.  
Refer to 9-1.5.  
Is the stopper of the horizontal vane  
locked to the indoor unit correctly?  
Yes  
Turn ON the  
power supply.  
No  
Are all lamp flashing?  
Yes  
OK  
To check the continuity of the interlock switch  
Turn OFF the  
power supply.  
(Fan), measure the resistance of connector 1- 2  
connected to CN1R1 on the indoor  
electronic control P.C. board.  
No()  
Replace the  
interlock switch(Fan).  
Is there resistance 0 "?  
Yes  
Replace the  
indoor electronic  
control P.C. board.  
25  
When PLASMA/WASH lamp flashes 2-time.  
wThe power failure mode for PLASMA DEODORIZING power is memorized when the failure mode is called.  
F
Check of PLASMA DEODORIZING power  
After performing the check, make sure to release the failure mode recall function.  
High voltage (approx. -3.9kV) is generated during PLASMA  
DEODORIZING power operation.  
Turn ON the power supply.  
Pay careful attention and never touch PLASMA/WASH unit  
and the high-voltage lead part (red wire).  
While the operation is being  
stopped, does  
PLASMA/WASH lamp flash  
twice?  
Yes  
Replace the indoor electronic control P.C. board is out of order.  
1During pressing both OPERATION SELECT  
button and TOO COOL button on the remote  
controller at the same time, press RESET button.  
2First, release RESET button.  
And release the other two buttons since  
all LCD in operation display section of the  
remote controller is displayed after 3 seconds.  
(Failure mode recall function is set.)  
3Press OPERATE/STOP (ON/OFF) button.  
4After a short beep sound is emitted, press  
once PLASMA button.  
No  
Make sure that the front panel is firmly closed.  
1During pressing both OPERATION SELECT button and  
TOO COOL button on the remote controller at the same time,  
press RESET button.  
2First, release RESET button.  
And release the other two buttons since  
all LCD in operation display section of the  
remote controller is displayed after 3 seconds.  
(Failure mode recall function is set.)  
3Press OPERATE/STOP (ON/OFF) button.  
4After a short beep sound is emitted, press  
once PLASMA button.  
PLASMA DEODORIZING operation is  
selected.  
wThe plasma power operation check mode is set.(Refer to 9-2.5.)  
PLASMA DEODORIZING operation is  
selected.  
PLASMA  
DEODORIZING  
operation  
PLASMA DEODORIZING power supply is normal.  
The front panel is not firmly closed, therefore the  
protection by the interlock switch is active.  
Stays OFF  
Does PLASMA/WASH lamp stay OFF, or  
continuously flash?  
w1 Turn PLASMA DEODORIZING power OFF and ON again.  
(For turning off PLASMA DEODORIZING power, refer to 9-2.3.)  
(If it goes normal without turning OFF and ON, PLASMA/WASH lamp  
doesn't go OFF.  
Continuously flashes.  
If the plasma unit is dirty, clean the unit.  
After cleaning, make sure to attach the unit when it is  
completely dry.  
If the air conditioner goes ON with the plasma unit  
being wet, protection gets active and PLASMA/WASH  
lamp continuously flashes.  
Remove the plasma unit, firmly close the  
front panel, and then perform PLASMA  
DEODORIZING power operation check (w1).  
Does PLASMA/WASH lamp stay OFF, or  
continuously flash?  
Stays OFF  
Continuously flashes.  
Turn OFF the power supply, and check the  
SAFETY DEVICE(PLASMA UNIT).  
Is it firmly fixed?  
No  
Firmly fix the SAFETY DEVICE.  
Yes  
Turn ON and OFF the SAFETY DEVICE  
(PLASMA UNIT) using something like a screw  
driver, and measure the resistance value between  
CN1T2 1and 3 on the indoor electronic control  
P.C. board. Does the switch work?  
No  
No  
Replace the SAFETY DEVICE(PLASMA UNIT).  
Yes  
Keep the SAFETY DEVICE(PLASMA UNIT)  
ON using something like a screw driver.  
Turn ON the power supply.  
9.5V DC is generated.  
While the operation is being stopped, is the  
voltage between CN1 1(+) and 2(GND)  
on the PLASMA POWER P.C. board  
(PLASMA DEODORIZING) 0V?  
Replace the indoor electronic control P.C. board.  
Yes  
Set the plasma power failure mode recall function.  
When PLASMA button is pressed, is  
there voltage of 12.5V DC between CN1  
1(+) and 2(GND)?  
Replace the indoor electronic control P.C. board.  
Check the wiring of CN1T1 on the indoor electronic control  
P.C. board.  
No  
Yes  
Replace the PLASMA POWER P.C. board  
(PLASMA DEODORIZING).  
26  
When PLASMA/WASH lamp flashes 2-time.  
wThe power failure mode for PLASMA AIR PURIFYING power is memorized when the failure mode is called.  
G
Check of PLASMA AIR PURIFYING power  
After performing the check, make sure to release the failure mode recall function.  
High voltage (approx. -3.9kV) is generated during  
Turn ON the power supply.  
PLASMA AIR PURIFYING power operation.  
Pay careful attention and never touch PLASMA/WASH unit  
and the high-voltage lead part (red wire).  
While the operation is being  
stopped, does  
PLASMA/WASH lamp flash  
twice?  
Yes  
Replace the indoor electronic control P.C. board is out of order.  
1During pressing both OPERATION SELECT  
button and TOO COOL button on the remote  
controller at the same time, press RESET button.  
2First, release RESET button.  
No  
Make sure that the front panel is firmly closed.  
1During pressing both OPERATION SELECT button and  
TOO COOL button on the remote controller at the same time,  
press RESET button.  
And release the other two buttons since  
all LCD in operation display section of the  
remote controller is displayed after 3 seconds.  
(Failure mode recall function is set.)  
3Press OPERATE/STOP (ON/OFF) button.  
4After a short beep sound is emitted, press  
twice PLASMA button.  
2First, release RESET button.  
And release the other two buttons since  
all LCD in operation display section of the  
remote controller is displayed after 3 seconds.  
(Failure mode recall function is set.)  
3Press OPERATE/STOP (ON/OFF) button.  
4After a short beep sound is emitted, press  
twice PLASMA button.  
PLASMA AIR PURIFYING operation is  
selected.  
wThe plasma power operation check mode is set.(Refer to 9-2.5.)  
PLASMA AIR PURIFYING operation is  
selected.  
PLASMA AIR  
PURIFYING  
operation  
PLASMA AIR PURIFYING power supply is normal.  
The front panel is not firmly closed, therefore the  
protection by the interlock switch is active.  
Stays OFF  
Does PLASMA/WASH lamp stay OFF, or  
continuously flash?  
w1 Turn PLASMA AIR PURIFYING power OFF and ON again.  
(For turning off PLASMA AIR PURIFYING power, refer to 9-2.3.)  
(If it goes normal without turning OFF and ON, PLASMA/WASH lamp  
doesn't go OFF.  
Continuously flashes.  
If the plasma unit is dirty, clean the unit.  
After cleaning, make sure to attach the unit when it is  
completely dry.  
If the air conditioner goes ON with the plasma unit  
being wet, protection gets active and PLASMA/WASH  
lamp continuously flashes.  
Remove the plasma unit, firmly close the  
front panel, and then perform PLASMA AIR  
PURIFYING power operation check (w1).  
Does PLASMA/WASH lamp stay OFF, or  
continuously flash?  
Stays OFF  
Continuously flashes.  
Turn OFF the power supply, and check the  
SAFETY DEVICE(PLASMA UNIT).  
Is it firmly fixed?  
No  
Firmly fix the SAFETY DEVICE.  
Yes  
Turn ON and OFF the SAFETY DEVICE  
(PLASMA UNIT) using something like a screw  
driver, and measure the resistance value between  
CN1T2 1and 3 on the indoor electronic control  
P.C. board. Does the switch work?  
No  
No  
Replace the SAFETY DEVICE(PLASMA UNIT).  
Yes  
Keep the SAFETY DEVICE(PLASMA UNIT)  
ON using something like a screw driver.  
Turn ON the power supply.  
While the operation is being stopped, is the  
voltage between CN1 1(+) and 2(GND) on  
the PLASMA POWER P.C. board (PLASMA  
AIR PURIFYING) 0V?  
9.5V DC is generated.  
Replace the indoor electronic control P.C. board.  
Yes  
Set the plasma power failure mode recall function.  
When PLASMA button is pressed, is  
there voltage of 12.5V DC between CN1  
1(+) and 2(GND)?  
Replace the indoor electronic control P.C. board.  
Check the wiring of CN1T1 on the indoor electronic control  
P.C. board.  
No  
Yes  
Replace the PLASMA POWER P.C. board  
(PLASMA AIR PURIFYING).  
27  
Indoor unit and outdoor unit do not operate.  
Check of auto front panel  
H
Turn the remote controller ON.  
No  
Does the front panel automatically  
open? (Does it start to move?)  
Yes  
No  
Is the connector of the front panel  
driving motor unit or the indoor  
electric control P.C. board unplugged?  
Yes  
No  
Is the resistance value between  
terminals of the front panel driving  
motor unit normal?  
Plug in the connector and  
check from the start again.  
Yes  
Replace the front panel  
driving motor unit.  
Replace the indoor electric  
control P.C. board.  
No  
Is the front panel held 10mm or  
more upper than the level line of  
the nozzle top?  
Yes  
Replace the front panel  
driving motor unit.  
Front panel is normal.  
10 mm or  
more  
Z-Z side view  
28  
Electromagnetic noise enters into TV sets or radios  
I
No  
Is the unit earthed?  
Earth the unit.  
Yes  
Is the distance between the  
antennas and the indoor  
unit within 3m, or is the  
distance between the  
antennas and the outdoor  
unit within 3m?  
Extend the distance between  
the antennas and the indoor  
unit, or the antennas and the  
outdoor unit.  
Yes  
No  
Is the distance between the  
TV sets or radios and the  
Extend the distance between  
the TV sets or radios and the  
indoor unit, or the TV sets or  
radios and the outdoor unit.  
Yes  
indoor unit within 1m, or is  
the distance between the TV  
sets or radios and the  
outdoor unit within 3m?  
No  
Is there any antennas damage  
by rust or something , coaxial  
cable damage, or poor  
Yes  
Replace the antennas.  
Replace the coaxial cable.  
contact such as loosing of  
the connectors or wire  
disconnection of wiring of the  
antennas?  
No  
Yes  
Is the indoor/outdoor  
Extend the distance between  
the indoor/outdoor connecting  
wire of the air conditioner and  
the wiring of the antennas.  
connecting wire of the air  
conditioner and the wiring of  
the antennas in close?  
No  
Even if all of the above conditions is fulfilled, the electromagnetic noise may enter, depending on  
the electric field strength or the installation condition (combination of specific conditions such as  
antennas or wiring).  
Check the followings before asking for service.  
1.Devices affected by the electromagnetic noise  
TV sets, radios (FM/AM broadcast, shortwave)  
2.Channel, frequency, broadcast station affected by the electromagnetic noise  
3.Channel, frequency, broadcast station unaffected by the electromagnetic noise  
4.Layout of ;  
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring  
from antennas, receiver  
5.Electric field intensity of the broadcast station affected by the electromagnetic noise  
6.Presence or absence of amplifier such as booster  
7.Operation condition of air conditioner when the electromagnetic noise enters in.  
1)Turn OFF the power supply once, and then turn ON the power supply. In this situation check for  
the electromagnetic noise.  
2)Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button  
on the remote controller for power-on, and check for the electromagnetic noise.  
3)After a short time (3 minutes later after turning ON), the outdoor unit starts running. During  
operation, check for the electromagnetic noise.  
4)Press OPERATE/STOP (ON/OFF) button on the remote controller for power off, when the  
outdoor unit stops but the indoor/outdoor communication still runs on. In this situation check for  
the electromagnetic noise.  
After checking the above, consult the service representative.  
29  
9-7. Test point diagram and voltage  
E1  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
Indoor electronic control P.C. board  
Cement resistance  
(R111)  
5V DC  
12V DC  
Indoor fan motor  
(CN211)  
1311V DC  
3(-) Fiducial terminal of  
cathode side on measur-  
ing high-voltage DC  
415V DC  
5(+)3-6V DC  
6(+)0V DC or 15V DC  
Interlock switch(Fan)  
(CN1R1)  
Room temperature  
thermistor (CN111)  
Power supply input  
230V AC  
{
SW P.C. Board  
Varistor  
(NR11)  
WASH reset  
switch(SW2)  
CN2011  
(Used for check of con-  
ducting of thermal fuse)  
Indoor coil thermistor  
RT12(MAIN)12  
RT13(SUB)34  
(CN112)  
Emergency  
operation  
switch(SW1)  
Plasma deodorizing/air  
purifying filter units  
(CN1T1)  
Safety device(Plasma unit)  
(CN1T2)  
Horizontal and  
Vertical vane  
motor(CN151)  
Timer short mode  
point JPG, JPS  
(Refer to 8-1.)  
}
Power monitor  
receiver P.C.  
board.  
Front panel  
driving motor  
(CN1U1)  
i-see Sensor  
(CN110)  
Fuse  
(F11)  
Release of Auto restart  
function  
Solder the Jumper wire  
to JR07.  
(Refer to 8-3.)  
Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)]  
Room temperature thermistor (RT11)  
Plasma power P.C. board  
1DC 2.5V during PLASMA  
AIR PURIFYING/PLASMA  
DEODORIZING operation  
CN1  
High-voltage lead wire  
(Red)  
2GND  
3DC 12.5V during PLASMA  
AIR PURIFYING/PLASMA  
DEODORIZING operation  
Standard lead wire  
(Green)  
Temperature (:)  
30  
10  
DISASSEMBLY INSTRUCTIONS  
<"Terminal with locking mechanism" Detaching points>  
The terminal which has the locking mechanism can be detached as shown below.  
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.  
The terminal without locking mechanism can be detached by pulling it out.  
Check the shape of the terminal before detaching.  
(1) Slide the sleeve and check if there is a locking lever or not.  
(2) The terminal with this connector has the  
locking mechanism.  
Sleeve  
1Slide the sleeve.  
1Hold the sleeve, and  
2Pull the terminal while  
pushing the locking  
pull out the terminal  
slowly.  
Locking lever  
lever.  
Connector  
E1  
E1  
MSZ-FA25VA -  
INDOOR UNIT  
MSZ-FA35VA -  
OPERATING PROCEDURE  
PHOTOS  
1. Removing the panel  
Photo 1  
(1) Press and unlock the knobs on both sides of the front  
panel and lift the front panel until it is level, and then pull  
the hinges forward to remove the front panel.  
(2) Remove the horizontal vane.  
Front panel  
(3) Remove the screw caps of the panel.  
Remove the screws. (See Photo 1.)  
(4) Remove the screw of the front panel driving motor.  
(See Photo 2.)  
(5) Hold the lower part of both ends on the panel and pull it  
slightly toward you, and then remove the panel by pushing  
it upward.  
Screws of the panel  
Horizontal vane  
Photo 2  
Screw of the front panel  
driving motor  
31  
OPERATING PROCEDURE  
PHOTOS  
2. Removing the electronic control P.C. board, the  
power monitor receiver P.C. board, i-see Sensor,  
SW P.C. board and the terminal block  
(1) Remove the horizontal vane, the panel (Refer to 1.) and  
the corner box.  
Photo 3  
(2) Remove the screw of the V.A. clamp, and then the  
indoor/outdoor connecting wire.(See Photo 3.)  
(3) Remove the switch holder from the electrical cover.  
(See Photo 4.)  
Screws of  
(4) Remove the screw of the electrical cover, and then the  
electrical cover. (See Photo 4.)  
the terminal  
block cover  
(5) Remove the ground wire connected to the indoor electronic  
control P.C. board from the electrical box. (See Photo 5.)  
(6) Unhook the power monitor receiver P.C. board holder from  
the catch. (See Photo 5.)  
(7) Open the rear cover of the power monitor receiver P.C.  
board holder and pull out the power monitor receiver P.C.  
board.  
Screw of the V.A. clamp  
Drain hose  
(8) Remove the screws of the i-see Sensor cover and the i-see  
Sensor motor, and then the i-see Sensor motor.  
(9) Open the i-see Sensor holder and pull out the i-see Sensor.  
(10) Open the switch holder and pull out SW P.C. board.  
(11) Pull the electronic control P.C. board slightly toward you  
from the electrical box, and disconnect TAB3 and all the  
connectors on the electronic control P.C. board.  
(LD101 and LD105 are direct-mounted to the electronic  
control P.C. board.)  
Photo 4  
Switch holder  
(12) Pull out the electronic control P.C. board from the electrical  
box.  
(13) Remove the ground wire connected to the heat exchanger  
from the electrical box. (See Photo 5.)  
(14) Unhook the catches of the electrical box, and pull out the  
electrical box.  
Screw of the  
electrical cover.  
(15) Remove the screws of the terminal block cover, and then  
the terminal block cover and the terminal block holder.  
(See Photo 3.)  
(16) Remove the terminal block by sliding it.  
Photo 5  
Ground wires Fan motor  
connector (CN211)  
Connector of the  
interlock switch(Fan)  
(CN1R1)  
3. Removing the electrical box  
(1) Remove the horizontal vane, the panel (Refer to 1.) and the  
corner box.  
(2) Remove the screw of the V.A. clamp, and then the indoor/  
outdoor connecting wire.(See Photo 3.)  
(3) Remove the switch holder and the electrical cover.  
(See Photo 4.)  
(4) Remove the ground wire connected to the heat exchanger  
from the electrical box.(See Photo 5.)  
Indoor coil thermistor  
connector (CN112)  
Connector of the  
plasma power  
P.C.board(CN1T1)  
(5) Disconnect the following connectors on the electronic  
control P.C. board; the fan motor connector <CN211>, the  
indoor coil thermistor connector <CN112>, the vane motor  
connector <CN151>, the connector of the interlock switch  
(Fan) of the horizontal vane <CN1R1>, the connector of  
the safety device (plasma unit) <CN1T2>, the connector of  
the plasma power P.C. board <CN1T1>, the connector of  
the front panel driving motor <CN1U1>.  
Connector of the  
safety device(Plasma  
unit) (CN1T2)  
Vane motor  
connector (CN151)  
Connector of the  
front panel driving  
motor (CN1U1)  
(6) Unhook the catches of the electrical box, and pull out the  
electrical box. (See Photo3.)  
Power monitor  
receiver P.C.  
board holder  
i-see Sensor  
i-see Sensor  
cover  
32  
OPERATING PROCEDURE  
PHOTOS  
Photo 6  
4. Removing the horizontal vane motor unit  
(1) Remove the horizontal vane and the panel. (Refer to 1.)  
(2) Remove the screws of the horizontal vane motor unit,  
and pull out the horizontal vane motor unit. (See Photo 6.)  
(3) Disconnect the connector from the horizontal vane motor  
unit.  
Screw of the horizontal  
vane motor unit  
Photo 7  
5. Removing the vertical vane motor unit  
(1) Remove the horizontal vane, the panel (Refer to 1.) and  
the corner box.  
(2) Pull out the drain hose from the nozzle assembly, and  
remove the nozzle assembly. (See Photo 5.)  
(3) Remove the crank of the vertical vane motor unit from the  
arm of the vertical vane.(See Photo 7.)  
(4) Remove the screws of the vertical vane motor unit, and pull  
the vertical vane motor unit. (See Photo 7.)  
Arm  
Crank of the vertical  
vane motor unit  
Screws of the vertical  
vane motor unit  
6. Removing the indoor fan motor and the line flow  
fan  
Photo 8  
Motor band  
(1) Remove the horizontal vane, the panel (Refer to 1.) and  
the corner box.  
(2) Remove the switch holder and the electrical box. (Refer to 3.)  
(3) Pull out the drain hose from the nozzle assembly, and  
remove the nozzle assembly.  
(4) Remove the screws fixing the motor bed. (See Photo 8.)  
(5) Loosen the screw fixing the line flow fan. (See Photo 9.)  
(6) Remove the motor bed together with fan motor and motor  
band.  
(7) Release the hooks of the motor band, and remove the  
motor band then pull out the indoor fan motor.  
(8) Remove the screws fixing the left side of the heat  
exchanger. (See Photo 10.)  
(9) Lift the heat exchanger, and pull out the line flow fan to the  
lower-left.  
Screws of  
the motor  
bed  
Photo 10  
Photo 9  
Screws of the  
left side of the  
heat exchanger  
Screw of  
the line  
flow fan  
33  
OPERATING PROCEDURE  
PHOTOS  
7. Removing the plasma power P.C. board  
(1) Remove the horizontal vane, the panel (Refer to 1.) and  
the corner box.  
Photo 11  
Photo 12  
Photo 13  
(2) Remove the switch holder and the electrical cover.  
(Refer to 3.)  
Screw of the plasma  
element holder  
Front panel  
driving motor  
(3) Disconnect the connector of the front panel driving motor  
<CN1U1> from the electronic control P.C. board.  
(4) Remove the front panel driving motor.  
(5) Remove the screw of the plasma element holder, and remove  
the plasma element holder from the heat exchanger.  
(See Photo 11.)  
(6) Unhook all the catches of plasma unit cover and remove  
the plasma unit cover. (See Photo 12.)  
(7) Remove the terminals with locking mechanism connected  
to the plasma power P.C. board and the safety device  
(Plasma unit). (See Photo 13.)  
(8) Remove the plasma electrical box from the plasma element  
holder.  
(9) Remove the screw fixing the plasma electrical box, and  
open the plasma electrical box then pull out the plasma  
power P.C. board from the plasma electrical box.  
(See Photo 13.)  
Plasma unit cover  
Terminal  
Screw of  
the plasma  
electrical box  
Terminal  
Safety device  
(Plasma unit)  
Terminal  
Terminal  
Plasma  
power  
P.C. board  
34  
11 PARTS LIST  
E1  
MSZ-FA25VA - (WH)  
E1  
MSZ-FA35VA - (WH)  
11-2. ACCESSORY AND REMOTE  
CONTROLLER  
11-1. INDOOR UNIT STRUCTURAL PARTS  
10  
9
1
8
7
2
3
4
5
6
11-1. INDOOR UNIT STRUCTURAL PARTS  
Q'ty/unit  
Symbol  
Remarks  
No.  
Part No.  
in Wiring  
Diagram  
Part name  
E1  
MSZ-FA25VA -  
E1  
MSZ-FA35VA -  
(WH)  
(WH)  
1
2
3
4
5
6
7
8
E02 897 234  
E02 913 000  
E02 913 067  
E02 913 010  
E02 914 100  
E02 913 100  
E02 913 975  
E02 913 970  
1
1
2
1
1
1
1
1
1
1
2
1
1
1
1
1
BOX  
PANEL ASSEMBLY (WH)  
SCREW CAP  
Including No.3,4  
2PCS/SET  
FRONT PANEL (WH)  
AIR FILTER (LEFT)  
AIR FILTER (RIGHT)  
CORNER BOX (RIGHT)  
INSTALLATION PLATE  
11-2. ACCESSORY AND REMOTE CONTROLLER  
E02 913 426  
1
1
1
1
9
REMOTE CONTROLLER  
KM05A  
E02 527 083  
10  
REMOTE CONTROLLER HOLDER  
35  
E1  
MSZ-FA25VA - (WH)  
E1  
MSZ-FA35VA - (WH)  
11-3. INDOOR UNIT ELECTRICAL PARTS  
AND FUNCTIONAL PARTS  
SAFETY  
DEVICE  
(PLASMA UNIT)  
PLASMA  
POWER  
P.C.BOARD  
29  
25 24  
27 26  
20  
30  
1
28  
31  
2
SLEEVE  
BEARING  
22  
3
4
32  
5
INTERLOCK  
SWITCH  
(FAN)  
6
7
21  
23  
8
SW P.C. BOARD  
18  
17  
16  
POWER MONITOR  
RECEIVER P.C. BOARD  
18  
15  
14  
13  
i-see Sensor  
MOTOR  
POWER MONITOR  
RECEIVER P.C.  
11  
BOARD HOLDER  
12  
i-see Sensor  
9
10  
18  
19  
FUSE VARISTOR  
NR11  
ROOM  
TEMPERATURE  
THERMISTOR  
11-4. INDOOR UNIT HEAT EXCHANGER  
33  
34  
35  
36  
11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS  
Q'ty/unit  
Symbol  
in Wiring  
Diagram  
No.  
Part No.  
Part name  
Remarks  
E1  
E1  
MSZ-FA25VA-  
(WH)  
MSZ-FA35VA-  
(WH)  
1
2
3
4
5
6
7
8
9
E02 751 509 BEARING MOUNT  
E02 001 504 SLEEVE BEARING  
E02 897 702 DRAIN HOSE  
E02 913 235 NOZZLE ASSEMBLY  
E02 897 303 VANE MOTOR UNIT (HORIZONTAL)  
E02 897 316 INTERLOCK SWITCH(FAN)  
E02 913 303 VANE MOTOR UNIT (VERTICAL)  
E02 913 040 HORIZONTAL VANE  
E02 127 382 FUSE  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
UP & DOWN  
MV1  
MV2  
RIGHT & LEFT  
3.15A  
F11  
NR11  
10 E02 661 385 VARISTOR  
11 E02 913 095 POWER MONITOR RECEIVER P.C. BOARD HOLDER  
12 E02 913 391 i-see Sensor  
13 E02 914 303 i-see Sensor MOTOR  
14 E02 897 784 VA CLAMP  
15 E02 897 780 TERMINAL BLOCK COVER  
16 E02 897 779 TERMINAL BLOCK HOLDER  
17 E02 913 375 TERMINAL BLOCK  
RR  
MT  
TB  
AUTO RESTART  
AUTO RESTART  
E02 913 452 ELECTRONIC CONTROL P.C. BOARD W1  
E02 914 452 ELECTRONIC CONTROL P.C. BOARD W1  
18  
1
1
RT11  
RT12, RT13  
RT12, RT13  
19 E02 897 308 ROOM TEMPERATURE THERMISTOR  
1
1
E02 913 307 INDOOR COIL THERMISTOR  
E02 914 307 INDOOR COIL THERMISTOR  
20  
1
1
1
1
1
1
1
1
1
2
1
1
1
21 E02 913 782 SWITCH HOLDER  
22 E02 897 300 INDOOR FAN MOTOR W2  
23 E02 897 333 MOTOR BAND  
24 E02 898 303 FRONT PANEL DRIVING MOTOR  
25 E02 897 302 LINE FLOW FAN  
26 E02 913 775 PLASMA ELEMENT HOLDER  
27 E02 913 776 PLASMA UNIT COVER  
28 E02 913 777 PLASMA ELECTRICAL BOX  
29 E02 897 440 PLASMA POWER P.C. BOARD  
30 E02 898 316 SAFETY DEVICE (PLASMA UNIT)  
31 E02 913 774 PLASMA AIR PURIFYING FILTER UNIT  
32 E02 914 774 PLASMA DEODORIZING FILTER UNIT  
1
1
1
1
1
1
1
1
2
1
1
1
MF  
MP  
RC0J40-  
PLASMA_A  
PLASMA_D  
W1 Including SW P.C. BOARD and POWER MONITOR RECEIVER P.C. BOARD  
W2 Including FAN MOTOR RUBBER MOUNT (2 PCS/SET)  
11-4. INDOOR UNIT HEAT EXCHANGER  
INDOOR HEAT EXCHANGER  
INDOOR HEAT EXCHANGER  
UNION (GAS)  
1
E02 913 620  
E02 914 620  
34 E02 815 666  
35 E02 151 667  
33  
1
1
1
{9.52  
{6.35  
1
1
UNION (LIQUID)  
37  
12 OPTIONAL PARTS  
DEODORIZING CERAMIC FILTER  
Replacement of the deodorizing ceramic filter(about once every 6 years)  
Deodorizing ceramic filter is installed inside PLASMA DEODORIZING filter unit. The filter is fragile. Handle it with care.  
NOTE: PLASMA DEODORIZING filter unit may not operate properly if the deodorizing ceramic filter is not installed.  
Be sure to install the deodorizing ceramic filter.  
(1) Release the two knobs to open the filter unit.  
(2) Pull the side knobs to outward and then  
forward to remove, as illustrated below.  
(3) Pull out the deodorizing ceramic filter from the side of  
the filter unit.  
Deodorizing ceramic filter  
(1)  
(2)  
(4) Install the deodorizing ceramic filter by following the  
removal procedure in reverse.  
Model  
Part No.  
MAC-305FT-E  
E1  
MSZ-FA25VA -  
MSZ-FA35VA -  
E1  
38  
39  
HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN  
C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD  
New publication, effective Jan. 2005  
Specifications subject to change without notice.  
Distributed in Jan. 2005. No. OB371 6  
Made in Japan  

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