Lenox Thermostat L5711U User Manual

OWNER’S  
GUIDE  
E2007 Lennox Industries Inc.  
Dallas, Texas, USA  
ComfortSenset 5000 Series Models L5711U  
and L5732U Programmable Touch Screen  
Thermostats  
IMPORTANT  
Read and save these instructions.  
506067−01  
2/2008  
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S
S
S
Override options allow you to easily override the pro-  
grammed schedule.  
Same−schedule programming allows you to program a  
schedule for several days at once. No need to copy.  
Armchair programming allows you to remove the thermo-  
stat from the wall while you program your schedules.  
Thermostat Display  
FAN SYSTEM  
SELECT AUTO, SELECT EMERGENCY HEAT,  
UP ARROW  
RAISES  
ON OR CIRC  
HEAT, OFF OR COOL  
TEMPERATURE  
SETTING  
FAN  
Set To  
AUTO  
DOWN ARROW  
LOWERS  
SYSTEM  
TEMPERATURE  
SETTING  
HEAT  
AM  
SCHED  
CLOCK  
MORE  
SELECT TO  
ENTER SCHED-  
ULE MODE  
USED TO SET  
TIME FORWARD  
OR BACK  
SHOWS FURNACE FILTER,  
UV LIGHT OR HUMIDIFIER  
PAD CHANGE REMINDER  
HOLD  
SETS A PERMANENT HOLD AND  
ACTIVATES VACATION HOLD  
SCREEN  
LOCKS TOUCH SCREEN  
FOR CLEANING  
Page 3  
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Thermostat Display (Continued)  
TUE  
SHOWS CURRENT  
DAY OF THE WEEK  
INSIDE  
SHOWS CURRENT  
INSIDE TEMPERATURE  
FAN  
SHOWS FAN  
SETTING  
SET TO  
SHOWS CURRENT  
TEMPERATURE  
SETTING  
TUE  
FAN  
Set To  
AUTO  
SYSTEM  
HEAT  
AM  
SYSTEM  
SHOWS  
CURRENT  
SYSTEM  
POSITION  
OUTSIDE  
SHOWS CURRENT  
OUTSIDE TEMPERATURE  
(IF SYSTEM INCLUDES  
OUTSIDE TEMPERATURE  
SENSOR)  
FOLLOWING  
SCHEDULE  
TIME  
SHOWS CURRENT  
TIME OF DAY, HOLD  
INDICATES THAT  
THERMOSTAT IS  
FOLLOWING THE  
PROGRAMMED  
SCHEDULE  
TIME REMAINING OR  
NUMBER OF VACATION  
DAYS REMAINING  
Page 4  
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System Settings  
TUE  
FAN  
Set To  
Inside  
AUTO  
Following  
Schedule  
SYSTEM  
Outside  
HEAT  
AM  
SCHED  
HOLD  
CLOCK  
SCREEN  
MORE  
PRESS SYSTEM  
SELECT SETTING OF HEAT,  
OFF, COOL OR EM HEAT  
(HEAT PUMP SYSTEMS ONLY)  
SYSTEM SETTINGS  
The system setting options vary based on your heating and/or  
cooling type.  
HEAT Ċ Thermostat controls heating system.  
OFF  
Ċ Both heating and cooling systems are off.  
COOL Ċ Thermostat controls cooling system.  
AUTO Ċ The thermostat switches the system from the heat-  
ing mode to the cooling mode based on temperature.  
EM HEATĊHeat pump systems only −− Thermostat controls  
emergency heat and auxiliary heat, if needed. Heat pump com-  
pressor is not operational.  
Page 5  
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Fan Settings  
PRESS FAN.  
SELECT SETTING:  
ON, AUTO OR CIRC.  
TUE  
FAN  
Set To  
Inside  
AUTO  
Following  
Schedule  
SYSTEM  
Outside  
HEAT  
AM  
SCHED  
HOLD  
CLOCK  
SCREEN  
MORE  
FAN SETTINGS  
ON Ċ Fan runs continuously. Use this setting for improved  
air circulation or for more efficient central air cleaning.  
AUTO Ċ Fan runs only when heating or cooling system is on.  
CIRC Ċ Fan runs randomly approximately 35% of the time.  
Use this setting for improved air circulation or for more efficient  
central air cleaning when you do not want the fan to run continu-  
ously.  
Page 6  
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Program Your Heating and Cooling Schedule  
NOTE − The thermostat includes a battery which makes it pos-  
sible for you to remove the thermostat from the wallplate during  
program. See page 19.  
Your thermostat can control up to four different schedule periods  
per day:  
Wake Ċ Time when you awaken and want your home at a  
comfortable temperature.  
Leave Ċ Time when you leave the home and prefer an ener-  
gy−saving temperature setting.  
Return Ċ Time when you return home and want your home to  
return to a more comfortable temperature setting.  
Sleep Ċ Time when you are asleep and prefer an energy−  
saving temperature setting.  
NOTE − Schedule times are in 15−minute intervals.  
EDIT THE SCHEDULE:  
1 − Press the SCHED key. The SCHEDULE screen will be dis-  
played.  
2 − Press the EDIT key. The screen will change to display the  
days of the week across the top.  
MON  
TUE  
WED  
THU  
FRI  
SAT  
SUN  
OK TO PICK MULTIPLE DAYS  
CANCEL  
Page 7  
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Program Your Heating and Cooling Schedule (Cont.)  
3 − Select any combination of days to edit. You may select  
multiple days. These should be days that you wish to follow  
the same schedule. Check marks appear next to the days  
that are selected. After the first day is selected, the SCHED-  
ULE screen returns to the display.  
4 − Press the WAKE key. The WAKE key will flash to show it  
is selected.  
5 − Press the UP and DOWN keys to modify time and heat  
and cool temperatures shown on the screen.  
6 − Press LEAVE key and repeat step 5.  
MON  
TUE  
WED  
THU  
FRI  
SAT  
SUN  
OK TO PICK MULTIPLE DAYS  
FAN  
HEAT  
CIRC  
CANCEL  
PERIOD  
AM  
COOL  
DONE  
WAKE  
LEAVE RETURN SLEEP  
CANCEL  
Page 8  
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Program Your Heating and Cooling Schedule (Cont.)  
NOTE − The FAN setting can be programmed for ON, AUTO or  
CIRC for each period selected. See following page for more in-  
formation about fan setting options.  
9 − Press DONE key when finished. Saving changes screen  
appears to indicate that schedule changes are being saved  
to the days selected.  
10 Repeat steps 1 through 9 to set a program schedule for  
the remaining days of the week. Example: If Mon − Fri was  
selected first, repeat steps 1 through 9 to program Sat and  
Sun.  
NOTE − To exit the schedule without saving changes, press  
CANCEL key at any time.  
MON TUEꢂꢂꢃꢄꢅWEDꢂꢂꢃꢄTHUꢂꢂꢆꢄꢅFRI  
SAVING CHANGES  
Page 9  
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Fan Schedule  
The FAN setting can be programmed for ON, AUTO or CIRC for  
each period selected:  
ON Ċ Fan runs continuously. Use this setting for improved  
air circulation or for more efficient central air cleaning.  
AUTO Ċ Fan runs only when heating or cooling system is on.  
CIRC Ċ Fan runs randomly approximately 35% of the time.  
Use this setting for improved air circulation or for more efficient  
central air cleaning when you do not want the fan to run continu-  
ously.  
Fan Status Display on Home ScreenĊIf the fan program is  
scheduled, AUTO is displayed as the fan setting, along with the  
particular fan setting that has been programmed. For example, if,  
during the WAKE period, the Fan has been set to AUTO, then  
AUTO is shown as the fan setting. However, if, during the WAKE  
period, the Fan has been set to ON, both AUTO and ON are dis-  
played. AUTO indicates that the fan has been scheduled and ON  
indicates that the fan has been scheduled to be ON.  
Manually Override Scheduled Fan SettingĊIf the fan setting  
is scheduled, press the FAN key, then press the desired fan set-  
ting to manually override the scheduled fan setting. Fan opera-  
tion will return to the programmed operation when the next  
schedule period begins.  
THU  
FAN  
Inside  
Set To  
ON  
AUTO  
Following  
Schedule  
SYSTEM  
HEAT  
AM  
SCHED  
HOLD  
CLOCK SCREEN  
Page 10  
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Cancel a Schedule Period  
You may wish to cancel a period to match your lifestyle. For  
example, if someone is always home during the day on Tues-  
day, you can cancel the LEAVE and RETURN periods to  
have the thermostat hold the WAKE temperature until the  
SLEEP period is reached.  
1 − Press the SCHED key. The SCHEDULE screen will be  
displayed.  
2 − Press the EDIT key. The screen will change to display the  
days of the week across the top.  
3 − Select the day or days of the week that are affected by  
the schedule change.  
4 − Press the schedule period you want to cancel: WAKE,  
LEAVE, RETURN or SLEEP. Once selected the period will  
flash to show it is selected.  
5 − Press the CANCEL key. The time, temperature(s) and  
fan settings will all dissappear from the screen. The bar  
above the selected period is removed to indicate that the se-  
lected period was cancelled.  
6 − Press DONE key.  
NOTE − A schedule period may be reinstated at any time by  
entering the schedule edit screen, selecting the period and  
pressing the arrow keys to set the desired time and tempera-  
tures.  
SUN  
TUE WED  
THU  
FRI  
SAT  
MON  
OK TO PICK MULTIPLE DAYS  
FAN  
HEAT  
COOL  
DONE  
WAKE  
LEAVE RETURN SLEEP CANCEL  
Page 11  
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Set the Time  
1 − Press the CLOCK key. The current time setting will be dis-  
played as shown below.  
2 − Use the arrows to set the correct time.  
3 − Press DONE key.  
IMPORTANT − The current day of the week should be displayed  
correctly on this screen. If not, refer to the Advanced Settings  
section to correct the day of the week display.  
TUE  
AM  
DONE  
CANCEL  
Page 12  
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Override Temperature SettingĊTemporary Hold  
You may use the temporary hold function to override the pro-  
grammed temperature setting until the next scheduled period  
or until a particular time that you wish.  
1 − Press the UP or DOWN arrow next to the temperature  
display to adjust the temperature as desired.  
NOTE − ꢀHold Temperature Until" appears on the screen. The  
currently programmed start time of the next scheduled period  
also appears, as does an additional set of arrows.  
2 − Use the UP and Down arrows next to the displayed  
time to set the time that you wish for the thermostat to  
resume the schedule.  
NOTE − The time arrows are displayed for approximately  
seven seconds. Press the screen where the hold temperature  
time is shown to allow the arrows to reappear.  
3 − Press CANCEL or SCHED key to cancel temperature  
hold and resume schedule. ꢁFollowing Schedule" appears  
on the screen to indicate that the temporary hold has ended.  
TUE  
FAN  
Inside  
Set To  
AUTO  
SYSTEM  
Hold Temperature  
Until  
HEAT  
PM  
SCHED  
HOLD  
CLOCK  
SCREEN  
CANCEL  
Page 13  
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Override Temperature SettingĊPermanent Hold  
The permanent hold function overrides the programmed temper-  
ature setting until the permanent hold is cancelled.  
1 − Press the HOLD key.  
NOTE − ꢁPermanent Hold" appears on the screen under the cur-  
rent time.  
2 − Use the UP and Down to adjust the temperature to the  
setting that you want the thermostat to hold.  
3 − Press CANCEL key to cancel permanent hold and re-  
sume schedule. ꢁFollowing Schedule" appears on the  
screen to indicate that the hold has ended.  
TUE  
FAN  
Inside  
Set To  
AUTO  
SYSTEM  
HEAT  
AM  
Permanent  
Hold  
SCHED  
HOLD  
CLOCK  
SCREEN  
CANCEL  
Page 14  
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Override Temperature SettingĊVacation Hold  
You may use the vacation hold function to override the pro-  
grammed temperature setting for a designated number of days.  
1 − Press the UP or DOWN arrow next to the temperature  
display to adjust the temperature as desired.  
NOTE − ꢀHold Temperature Until" appears on the screen. The  
currently programmed start time of the next scheduled period  
also appears, as does an additional set of arrows. This is the time  
of day that the override will expire after the hold period ends.  
2 − Press the HOLD key twice. Screen shows ꢁHold Tempera-  
ture Until" one day.  
3 − Press the UP and DOWN arrows to adjust the number of  
days you would like to override the schedule.  
NOTE − Arrows used to adjust the number of days are displayed  
for approximately seven seconds. Press the screen where the  
number of days are shown to allow the arrows to reappear.  
4 − Press the CANCEL key to cancel the vacation override  
early.  
NOTE − When the programmed vacation hold expires, the  
screen displays ꢀFollowing Schedule" to indicate that the hold  
has ended.  
THU  
FAN  
Inside  
Set To  
AUTO  
SYSTEM  
Hold Temperature  
Until  
HEAT  
DAYS  
SCHED  
CLOCK  
SCREEN  
CANCEL  
Page 15  
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Temperature Recovery Feature  
Your thermostat is equipped with a feature that accommodates  
recovery time to ensure your comfort.  
Recovery time is the time that it takes your heating and cooling  
equipment to recover from energy−saving settings programmed  
during away or asleep periods. Recovery time depends on local  
weather, your schedule, the contruction of your home and your  
heating and/or cooling equipment.  
Your thermostat tracks the time that it takes for your system to  
reach your desired settings (recovery period). This allows the  
thermostat to accommodate this recovery period and to ensure  
your comfort at the programmed wake and return settings.  
For example, your WAKE period is programmed for 6:00 a.m.  
and 70°F. The thermostat activates heating in advance of 6:00  
a.m. to ensure that your desired comfort setting of 70°F is  
reached by the time you awake.  
A recovery notice is displayed when the system is operating be-  
fore the scheduled time.  
TUE  
FAN  
Set To  
Inside  
AUTO  
Following  
Schedule  
SYSTEM  
RECOVERY  
HEAT  
AM  
SCHED  
HOLD  
CLOCK  
SCREEN  
MORE  
Page 16  
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Clean the Thermostat Screen  
The thermostat screen may be cleaned, if necessary.  
1 − Press the SCREEN key. The thermostat locks the touch  
screen for 30 seconds to allow for cleaning.  
2 − Use a damp cloth slightly moistened with water or  
household glass cleaner to clean the screen.  
IMPORTANT − Do not spray any type of liquid directly onto the  
thermostat. Spray the water or household glass cleaner on a  
cloth, then use the cloth to clean the thermostat screen.  
3 − Repeat the above steps as necessary.  
4 − Press the DONE key to return to the home screen and  
normal operation.  
OK TO  
CLEAN  
SCREEN  
DONE  
Page 17  
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Battery Replacement  
If your thermostat has batteries, a low battery warning flashes on  
the home screen for approximately 30 days.  
IMPORTANT − Batteries should be replaced once per year to  
prevent leakage and to prevent loss of battery back−up in a pow-  
er outtage. You may also wish to replace the batteries prior to  
leaving your home for more than a month.  
1 − When the low battery indicator is flashing, replace the  
batteries promptly with three fresh AAA alkaline batter-  
ies.  
2 − Remove the thermostat from the wallplate by pulling  
straight out.  
WALL  
Page 18  
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Battery Replacement (Continued)  
3 − Remove the old batteries and insert three fresh AAA al-  
kaline batteries, as marked on the thermostat.  
BACK OF THERMOSTAT  
+
+
+
BATTERIES (3)  
4 − Align the terminal screw blocks with the pins on the  
back of the thermostat.  
5 − Push the thermostat straight onto the wallplate until it  
snaps into place.  
WALLPLATE  
PINS ON  
BACK OF  
THERMOSTAT  
TERMINAL  
SCREW  
BLOCK  
Page 19  
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Reminder Timers  
The reminder timers notify you when it is time to change the fur-  
nace filter, humidifier pad or ultraviolet lamp. When one of the set  
timers expires, a reset key appears on the home screen.  
Reset Timers  
1 − ꢀChange" reminder appears on the screen when the  
timer expires.  
2 − Press the RESET key to restart the timer. If more than  
one timer expires at the same time, press the RESET key  
until all timers have been reset.  
MON  
SUN  
TUE WED  
THU  
FRI  
SAT  
CHANGE FILTER  
Set to  
Inside  
Following  
Schedule  
View or Reset Timer Settings Before They Expire  
1 − Press the MORE key until the timer you want to modify  
appears on the screen.  
2 − Press the EDIT key to change the Timer Reload Value.  
Use the UP or DOWN arrow keys to change the number of  
run time days. See the Advanced Settings section, step 8  
through 10 for more information.  
3 − Press the DONE key to return to the selected timer.  
4 − Press the RESET key to reset the timer to the Timer Re-  
load Value.  
5 − Press DONE or CANCEL key to return to home screen.  
Page 20  
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Built−In Compressor Protection  
The thermostat provides built−in compressor protection (mini-  
mum−off timer) that prevents the compressor from restarting too  
early after a shutdown.  
The minimum−off timer is activated after the compressor shuts  
off.  
If there is a demand for compressor operation during the delay,  
the thermostat displays the WAIT message.  
When the minimum−off delay expires, COOL ON ( or HEAT ON in  
heat pump applications) is displayed solidly on the screen and  
the compressor and fan are allowed to operate to meet the de-  
mand.  
TUE  
FAN  
Set to  
Inside  
AUTO  
Wait Cool  
Following  
Schedule  
HEAT  
AM  
PM  
SCHEDꢂꢆꢄꢅHOLDꢂꢆꢄCLOCKꢂꢅSCREENꢂꢃꢄMORE  
Page 21  
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Outdoor Temperature  
If an optional outdoor temperature sensor has been installed with  
your thermostat, the outdoor temperature is displayed in the low-  
er right corner of the home screen.  
If the temperature is not displayed and an outdoor temperature  
sensor has been installed, press the MORE key until the outside  
temperature is displayed.  
TUE  
FAN  
Set To  
Inside  
AUTO  
SYSTEM  
Following  
Schedule  
HEAT  
Outside  
AM  
SCHED  
HOLD  
CLOCK  
SCREEN  
MORE  
Advanced Heat Pump Features (Select Models)  
Some thermostat models, when used in heat pump systems  
which include an optional outdoor temperature sensor, provide  
additional features. In these applications, the compressor and/or  
back−up heat lockout may be based on the outside temperature.  
Page 22  
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Screen Lock  
You can fully or partially lock the keys on the touch screen. See  
the Advanced Settings section for more information on this fea-  
ture. If the thermostat displays a ꢁScreen Locked" message, your  
thermostat screen is either fully or partially locked.  
Partially Locked Screen  
When partially locked, all touch screen keys are locked except  
the temperature up and down arrow keys and the SYSTEM key  
access to the user set−up options. The Screen Locked message  
is displayed for 5 to 7 seconds each time the user attempts to  
press a key that is locked.  
When the screen is partially locked, you will be able to adjust the  
temperature setting up or down; but schedule settings will not be  
accessible. The temporary temperature change lasts until the  
next scheduled period. Refer to Temporary Temperature Over-  
ride section. To cancel the temporary temperature override and  
return to the programmed schedule, press the CANCEL key.  
Fully Locked Screen  
When the screen is fully locked, you will still be allowed to access  
the user set−up options through the SYSTEM key; however, all  
other touch screen keys are locked and are not functional. The  
Screen Locked message is displayed continuously.  
TUE  
SCREEN LOCKED  
FAN  
Set To  
Inside  
AUTO  
Following  
Schedule  
SYSTEM  
HEAT  
PM  
SCHED  
HOLD  
CLOCK SCREEN MORE  
Page 23  
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Advanced Settings  
Your thermostat has many advanced settings that can be used to  
match your desired use of this important tool. These items have  
been set by the installer during the installer set−up process; how-  
ever, use the following information to customize the settings for  
your use.  
Use the following steps and the User Set−Up table on pages 25  
through 27 to customize your thermostat operation.  
1 − Press and release the SYSTEM key.  
2 − Press and hold the center blank key for approximately five  
seconds, until the screen changes.  
TUE  
CHANGE FILTER UV LAMP HUMIDIFIER PAD  
Set To  
Inside  
Following  
Schedule  
SYSTEM  
EM HEAT  
OFF  
PM  
CANCEL  
3 − Release the key when the thermostat display matches the  
display below.  
DONE  
Page 24  
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Advanced Settings (Continued)  
4 − Refer to the figure below to see how the thermostat buttons  
are used to make selections.  
5 − Refer to the table on the following pages to make proper set−  
up choices for your application.  
6 − When all set−up selections have been made, press the  
DONE key to save your settings. The thermostat display will  
return to the main screen.  
NOTE − Thermostats manufactured beginning March 2006 in-  
clude program selection to accommodate 2007 daylight savings  
calendar. Advanced setting number 330 must be changed to op-  
tion 2 at the beginning of 2007 in areas which use the revised  
DST calendar in the US and Canada.  
ADVANCE TO NEXT  
USER SET−UP  
USER  
SET−UP  
NUMBER  
CURRENT  
SETTING  
DONE  
CHANGE THE  
CURRENT  
SETTING  
PRESS TO EXIT  
INSTALLER SET−UP  
RETURN TO PREVIOUS  
USER SET−UP  
Page 25  
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Advanced Settings (Continued)  
User Set−  
Up No.  
Set−Up Name  
Selection Description  
Select first two digits of current  
calendar year (20 for 2007, etc.)  
0120  
Date (Year/first)  
Select last two digits of current  
Date (Year/last) calendar year (07 for 2007, etc.)  
Options: 01 to 99 available.  
0130  
0140  
0150  
Select number that represents  
current calendar month.  
Options 1 through 12.  
Date (Month)  
Date (Day)  
Select number that represents  
current calendar date.  
Options 1 through 31.  
Select the type of scheduling that  
will be used. Options:  
0− non−programmable thermostat  
4− fully programmable thermostat  
with 7−day scheduling  
Schedule Op-  
tions  
0160  
0320  
Select the temperature display to  
be used. Options:  
0− Fahrenheit  
Temperature  
Display Scale  
1− Celsius  
Page 26  
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Advanced Settings (Continued)  
User Set−  
Up No.  
Set−Up Name  
Selection Description  
Options: 0 − Off. Thermostat time  
is not automatically adjusted for  
DST.  
1 − On. Thermostat time is auto-  
matically adjusted for Daylight  
Savings in the Fall and Spring  
(using the pre−2007 DST calen-  
dar)  
Daylight Sav-  
ings  
0330  
2 − On. Thermostat time is auto-  
matically adjusted for Daylight  
Savings in Fall and Spring (using  
2007 DST calendar for US and  
portions of Canada)  
Select option for filter change re-  
minder timer. Options:  
0 − Reminder is off  
1 − 10 run time days  
2 − 30 run time days  
3 − 60 run time days  
4 − 90 run time days  
5 − 120 run time days  
6 − 365 run time days  
Filter Change  
Reminder  
0500  
Select option for humidifier pad  
replacement reminder timer. Op-  
Humidifier Pad tions:  
Replacement  
Reminder  
0 − Reminder is off  
0510  
1 − 90 run time days  
2 − 180 run time days  
3 − 365 run time days  
Page 27  
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Advanced Settings (Continued)  
User Set−  
Up No.  
Set−Up Name  
Selection Description  
Select option for UV lamp re-  
placement reminder timer. Op-  
tions:  
0 − Reminder is off  
1 − 365 run time days  
UV Lamp Re-  
placement Re-  
minder  
0520  
Select option for number of  
scheduling periods. Options:  
2 − Two periods (wake and sleep)  
4 − Four periods (wake, leave, re-  
turn, sleep)  
Number of Peri-  
ods  
0540  
0640  
Select clock format. Options:  
12 − 12−hour clock  
24 − 24−hour clock  
Clock Format  
Select screen lockout. Options:  
0 − All keys are functional;  
screen is unlocked.  
1 − Screen partially locked −− only  
temp. up and down keys and  
ability to enter installer set−up  
mode and modify set−up selec-  
tions are enabled.  
Screen Lock−  
Out  
0670  
2 − Screen fully locked −− only  
ability to enter installer set−up  
mode and modify set−up selec-  
tions are enabled.  
Page 28  
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Troubleshooting Tips  
If...  
Then...  
Key to the right MORE key remains blank unless the Furnace  
of the screen  
key is blank.  
Filter Change Reminder has been turned on.  
See User Set−Up Number 0500.  
Display is  
blank.  
Check that fresh AAA alkaline batteries are  
installed as marked on the thermostat.  
Temperature  
settings do not  
change.  
Check that temperature settings are:  
¯ Heating 40°F to 90°F (4.5°C to 32°C).  
¯ Cooling 50°F to 99°F (10°C to 37°C).  
Heating system ¯ Press the SYSTEM key to set to heat.  
does not turn  
on.  
¯ Check the heat temperature setting to be  
sure it is set above the room temperature and  
ꢁHeat On" is displayed solidly on the screen.  
¯ Make sure circuit breaker is not tripped.  
¯ Check the power switch at the heating  
and/or cooling system to make sure it is on.  
¯ Check the furnace door to make sure it is  
closed securely.  
¯ Wait five minutes for the heating system to  
respond.  
¯ If the problem has not been identified and  
corrected, contact a qualified service techni-  
cian.  
Page 29  
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Troubleshooting Tips  
If...  
Then...  
Cooling system ¯ Press SYSTEM key to set to Cool.  
does not turn  
on.  
¯ Check the cool temperature setting to be  
sure it is set below the room temperature and  
ꢁCool On" is displayed solidly on the screen.  
¯ Make sure circuit breaker is not tripped.  
¯ Check the power switch at the heating  
and/or cooling system to make sure it is on.  
¯ Check the furnace door to make sure it is  
closed securely.  
¯ Wait five minutes for the cooling system to  
respond.  
¯ If the problem has not been identified and  
corrected, contact a qualified service techni-  
cian.  
Cannot set Sys- Check Installer Set−Up Number 170: Heating  
tem setting to  
Cool.  
and/or Cooling Type*. Make sure the setting  
matches the installed heating and/or cooling  
system.  
ꢁHeat On" is not Set the System setting to Heat and set the  
displayed on  
the screen.  
temperature setting above the room tempera-  
ture. If ꢁHeat On" is shown solidly in the dis-  
play, but the heating system does not turn on,  
see ꢁHeating system does not turn on"  
suggestions on the previous page.  
Page 30  
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Troubleshooting Tips  
If...  
Then...  
ꢁCool On" is not Set the System setting to Cool and set the  
displayed on  
the screen.  
temperature setting below the room tempera-  
ture. If ꢁCool On" is shown solidly in the dis-  
play, but the cooling system does not turn on,  
see ꢁCooling system does not turn on"  
suggestions at the top of this page.  
ꢁWait" is dis-  
played on the  
screen.  
Compressor minimum−off timer is activated.  
Wait up to five minutes for the compressor to  
turn on.  
Fan does not Check Installer Set−Up 0180: Fan Control in  
turn on in a call Heating*. Make sure Electric Heat option is  
for heat (elec-  
tric furnaces  
only)  
selected.  
Both heating Check Installer Set−Up Number 170: Heating  
and cooling and/or Cooling Type*. Make sure the setting  
systems are op- matches the installed heating and/or cooling  
erating at the  
same time.  
system.  
Check to ensure that bare portions of wires  
are not touching.  
Heating is run-  
ning in Cool  
mode.  
Check Installer Set−Up Number 170: Heating  
and/or Cooling Type*. Make sure the setting  
matches the installed heating and/or cooling  
system.  
Page 31  
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Troubleshooting Tips  
If...  
Then...  
Heating system Check Installer Set−Up Number 170: Heating  
does not turn and/or Cooling Type*. Make sure the setting  
off and the heat matches the installed heating and/or cooling  
temperature  
setting is set  
below the room  
temperature  
(ꢁHeat On" is  
not shown in  
display.)  
system.  
Red LED is lit in A system monitor is wired to the thermostat L  
the upper right  
corner of the  
thermostat  
terminal. Refer to suggestions given in Heat-  
ing or Cooling System Does Not Turn On  
sections in this table.  
when the sys-  
tem monitor de-  
tects a possible  
problem.  
*Refer to Installation Instructions for access to Installer  
Set−Up procedures.  
Page 32  
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