SERVICE MANUAL
HALF-SIZE
CONVECTION OVENS
ELECTRIC AND GAS
MODEL
ELECTRIC
ML
ECO2D
ECO2C
114570
114572
GAS
GCO2D
GCO2C
114569
114571
GCO2D Shown
- NOTICE -
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified. If you have attended a Vulcan Service School for this
product, you may be qualified to perform all the procedures
described in this manual.
This manual is not intended to be all encompassing. If you have
not attended a Vulcan Service School for this product, you should
read, in its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
required to perform the procedure. Procedures for which you do
not have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
Reproduction or other use of this Manual, without the express
written consent of Vulcan-Hart, is prohibited.
A product of VULCAN-HART
Form 24575 (12/96)
LOUISVILLE, KY 40201-0696
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HALF-SIZE CONVECTION OVENS - GENERAL
GENERAL
INTRODUCTION
General
This manual will cover half-size electric and gas convection ovens that use either a solid state control or an electronic
control.
Procedures in this manual are applicable to both gas and electric ovens unless specified.
SPECIFICATIONS
GAS OVENS
GAS DATA
MANIFOLD PRESSURE
ELECTRICAL DATA
INPUT BTU/HR
LOAD
AMP/LINE
(Watts)
Natural
2500
Propane
Natural
3.5" W.C.
3.5" W.C
Propane
10"W.C.
10"W.C.
120V
8
Single Oven
2500
5000
950
Stacked Oven
5000
1900
16
ELECTRIC OVENS
NOMINAL AMPS PER LINE WIRE
3 PHASE 1 PHASE
208V 240V
3-PHASE LOADING
(KW PER PHASE)
TOTAL
KW
208V
L2
22.9 10.4 12.5 19.9
45.8 20.8 25.0 39.7 18.0 21.7 52.9
240V
L1-L2 L2-L3 L1-L3
L1
L3
L1
L2
L3
Single Oven
5.5
2.5
5.0
0
0
3.0
6.0
9.0 10.9 26.5
23.0
45.9
Stacked
Ovens
11.0
TOOLS
•
•
•
•
Standard set of hand tools
VOM with AC current tester (Any VOM with a sensitivity of at least 20,000 ohms per volt can be used.)
Temperature tester
Manometer (Gas Ovens)
3
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
REMOVAL AND REPLACEMENT OF PARTS
COVERS AND PANELS
Right Side Panel
1. Remove the three screws which secure the right
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN CIRCUIT
BOX. PLACE A TAG ON THE CIRCUIT BOX
INDICATING THE CIRCUIT IS BEING SERVICED.
side of the control panel.
2. Loosen the two screws on the right side of the top
front cover.
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT. (When applicable)
3. Remove the remaining eight screws securing the
right side panel.
Top Front Cover
1. The top front cover is secured with four screws,
two on each side of cover. Remove these screws
then pull cover off unit.
4. Pull the right side panel out at the bottom then
down to remove.
2. Reverse the procedure to install.
5. Reverse the procedure to install.
Control Panel
1. On gas models, remove the handle from the
manual gas valve.
2. Remove the three screws from the left front and
loosen the three screws on the right side of the
control panel.
3.
Pull the panel away from the oven.
4. Unplug the lead wires to the control panel
components and disconnect the temperature
probe leads.
5. Reverse the procedure to install.
4
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
CONTROL PANEL
COMPONENTS
Removable Components
Listed on the illustration.
Procedure
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the control panel as outlined under
"COVERS AND PANELS".
2. Disconnect the wire leads at the component to be
replaced.
3. Remove the component.
4. Reverse the procedure to install the new
component, then check oven for proper
operation.
5
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
BLOWER AND/OR BLOWER
8. Disconnect the wire leads to the motor.
MOTOR
A. P1 (purple) to wire# 11
B. Orange (Low speed) to wire# 12
C. Blue (high speed) to wire# 13
D. Red wires connected together.
: UNPLUG UNIT BEFORE SERVICING.
WARNING
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
9. Remove the bolts that secure the motor to the
motor mounting plate and remove the motor from
the oven.
3. For gas ovens only, remove the heat exchanger
as outlined under “HEAT EXCHANGER”.
4. Loosen set screws on blower hub.
10. Place new motor in position on the motor
mounting plate and route the wiring through the
grommet in the component panel.
11. Install mounting pads and bolts. DO NOT tighten
mounting bolts.
12. Slide the blower onto motor shaft until hub is
flush with end of shaft and tighten set screws.
13. Adjust motor position until blower is parallel to
oven cavity wall with a spacing of ¼" as outlined
under "BLOWER ADJUSTMENT" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
14. Install baffle panel, rack guides and racks.
5. Remove blower from motor shaft. You may have
to use a bearing puller.
6. If the blower only is to be replaced, reverse
procedure to install and check blower to be
parallel with the motor mounting plate as outlined
under "BLOWER ADJUSTMENT" in "SERVICE
PROCEDURES AND ADJUSTMENTS”. If the
motor is to be replaced, continue to step 7.
7. Remove the right side panel.
6
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
OVEN DOOR
Disassembly
Removal
1. Open the door.
WARNING: UNPLUG UNIT BEFORE SERVICING.
2. Remove the door handle and latch plate.
1. Remove the top front cover as outlined under
"COVERS AND PANELS".
3. Remove the screws which secure the inner and
outer door panels to the door frame.
2. Remove the door switch lever from the door
shaft.
3. Remove the door switch bracket.
4. While supporting the door, remove the bearing,
door plate and spacer.
4. Remove the inner and outer door panel.
5. Remove the four screws and lift the window
assembly out.
NOTE: Use high temperature silicone between
the window and the door panel.
5. Lift the door from the lower bearing.
6. Reverse procedure to install door assembly and
check for proper adjustment as outlined under
"DOOR ADJUSTMENT" and "DOOR SWITCH
ADJUSTMENT" in "SERVICE PROCEDURES
AND ADJUSTMENTS".
6. Reverse the procedure to install the new window
and adjust the door as outlined under “DOOR
ADJUSTMENT”.
7
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
DOOR SWITCH
HEAT EXCHANGER (GAS
UNPLUG UNIT BEFORE SERVICING.
WARNING:
OVENS)
1. Remove the top front cover as outlined under
"COVERS AND PANELS".
UNPLUG UNIT BEFORE SERVICING.
WARNING:
WARNING:
SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
2. Disconnect the leads to the door switch.
3. Remove the switch which is secured by two
screws.
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
3. Remove the screws that secure the heat
exchanger and remove it from the oven.
4. Reverse the procedure to install the new
switch.
5. Adjust the door switch as outlined under
"DOOR SWITCH ADJUSTMENT" in
"SERVICE PROCEDURES AND
ADJUSTMENTS".
4. Reverse procedure to install.
8
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
BURNER (GAS OVENS)
GAS VALVE (GAS OVENS)
WARNING: UNPLUG UNIT BEFORE SERVICING.
WARNING: UNPLUG UNIT BEFORE SERVICING.
WARNING: SHUT OFF THE GAS BEFORE
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
SERVICING THE UNIT.
WARNING: ALL GAS JOINTS DISTURBED
DURING SERVICING MUST BE CHECKED FOR
LEAKS. CHECK WITH A SOAP AND WATER
SOLUTION (BUBBLES). DO NOT USE AN OPEN
FLAME.
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
3. Remove the right side panel as outlined under
“COVERS AND PANELS”.
A. CHECK ALL JOINTS PRIOR TO THE
GAS VALVE BEFORE LIGHTING UNIT.
4. Disconnect the lead wires to the electrode
assembly.
B. CHECK ALL JOINTS BEYOND GAS
VALVE AFTER UNIT IS LIT.
5. Remove the heat exchanger as outlined under
“HEAT EXCHANGER”.
1. Remove the right side panel and control panel
as outlined under “COVERS AND PANELS”.
6. Remove the screws from the burner bracket
and pull the burner into the oven cavity.
2. Disconnect the lead wires at the gas valve.
7. Remove the screws that secure the electrodes
to the burner bracket.
3. Disconnect the gas line fitting going to the
burner at the top of the gas valve.
8. Reverse procedure to install.
4. Remove the gas valve from the nipple between
the it and the manual gas valve.
NOTE: When installed, the electrodes are
positioned toward the front of the oven.
5. Reverse procedure to install.
6. Adjust the gas valve as outlined under “GAS
PRESSURE ADJUSTMENT”.
9
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HALF-SIZE CONVECTION OVENS - REMOVAL AND REPLACEMENT OF PARTS
HEATING ELEMENTS
(ELECTRIC OVENS)
TEMPERATURE PROBE
Procedure
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the control panel as outlined under
"COVERS AND PANELS".
2. Disconnect the probe leads at the temperature
control.
1. Remove racks and the right rack support.
2. Remove baffle panel by lifting up and out.
3. Remove probe from the probe guard and push
it thru the oven wall into the control panel area.
3. Remove the right side panel as outlined under
“COVERS AND PANELS”.
NOTE: When installing, only the metal surface of
the probe should be inserted into the probe guard.
4. Disconnect the lead wires to the heating
elements.
5. Remove the screws from the clamps that
secure the heating element assembly.
NOTE: The probe may have to be inserted at an
angle. The hole in the inside oven cavity wall may
not line up straight with the oven cavity outer shell.
4. Reverse the procedure to install the new probe.
5. Adjust the temperature control as outlined
under "TEMPERATURE CONTROL
CALIBRATION" in "SERVICE PROCEDURES
AND ADJUSTMENTS".
6. Pull the top of the heating element assembly
into the oven cavity until the ends of the
elements are inside the oven cavity. Lift up and
remove the lower clamp from between the side
wall and the bottom of the oven cavity.
7. Remove the clamps from the heating element
assembly and replace the element(s).
8. Reverse procedure to install.
10
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
SERVICE PROCEDURES AND ADJUSTMENTS
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR
MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL
TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST
EQUIPMENT AND REAPPLY POWER TO TEST.
TEMPERATURE PROBE
TEST (ALL MODELS)
VERIFICATION OF SPARK
AT SPARK PROBE
WARNING: UNPLUG UNIT BEFORE SERVICING.
WARNING: UNPLUG UNIT BEFORE SERVICING.
1. Remove the right side panel as outlined under
"COVERS AND PANELS".
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
2. Remove the probe lead wires from the
electronic control.
1. Remove the right side panel and control panel
as outlined under “COVERS AND PANELS”.
2. Disconnect the high voltage lead from the
electrode.
3. Test the probe with an ohmmeter.
WARNING: DO NOT HOLD THE WIRE WITH
YOUR HANDS FOR THIS TEST. THE MANUAL
GAS VALVE MUST BE CLOSED.
TEMPERA-
TURE
RESISTANCE
in ±10%
in F
3. Clamp the wire in such a manner that the end
of the wire is 3/16" from the frame of the oven.
77
90000
4077
3016
2266
1726
1332
1041
822
NOTE: It is critical that the wire be held 3/16" away
from the oven or sparking may not occur even
though the probe circuits are functioning properly.
240
260
280
300
320
340
360
380
400
425
450
475
656
529
424
334
WARNING: THE FOLLOWING STEPS REQUIRE
POWER TO BE APPLIED TO THE UNIT DURING
THE TEST. USE EXTREME CAUTION AT ALL
TIMES.
266
4. Plug the unit in and set the temperature
controller to the maximum setting.
5. Turn the power switch on.
6. Sparking should occur after a 15 second purge
time. Arcing from the lead wire to the oven
frame should be observed at this time.
11
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
GAS TYPE
SETTING AT OUTPUT
GAS PRESSURE
ADJUSTMENT
OF GAS VALVE
3.5 inches W.C.
10 inches W.C.
Natural
WARNING: UNPLUG UNIT BEFORE SERVICING.
Propane
WARNING: SHUT OFF THE GAS BEFORE
SERVICING THE UNIT.
NOTE: If input pressure is below 4.0 (Natural) or
10.5 (Propane) inches W.C., the desired output
cannot be obtained and the oven will overate at a
lower BTU.
1. Remove the right side panel and control panel
as outlined under “COVERS AND PANELS”.
SPARK IGNITION CONTROL
TEST
2. Remove the plug from the test port and install
the manometer.
WARNING: THE FOLLOWING STEPS REQUIRE
POWER TO BE APPLIED TO THE UNIT DURING
THE TEST. USE EXTREME CAUTION AT ALL
TIMES.
WARNING: UNPLUG UNIT BEFORE SERVICING.
NOTE: Verify that the ground terminal is connected
to the oven ground.
3. Plug in the unit and turn on the gas.
No Gas Ignition & No Sparking
4. Set the temperature control to the highest
setting and turn the power switch on. The
burner must be lit while adjusting the pressure.
1. Remove the right side panel as outlined under
“COVERS AND PANELS”.
2. Plug in the unit and set the temperature
5. Turn the adjustment screw to obtain the proper
gas pressure.
controller to 350°.
3. Turn the power switch on.
4. Check for 24 VAC between the power terminal
and ground terminal.
A. If 24 VAC is present, replace the spark
ignition control.
B. If 24 VAC is not present, check the
transformer, temperature controller, and
switches.
No gas ignition - sparking occurs
1. Remove the right side panel as outlined under
“COVERS AND PANELS”.
2. Plug in the unit and set the temperature
controller to 350°.
3. Turn the power switch on.
4. Check for 24 VAC between the gas valve
terminal and the ground terminal. The voltage
should be present after the 15 second purge
and during the 10 second ignition period.
•
•
Turn screw clockwise to increase pressure.
Turn screw counterclockwise to decrease
pressure.
A. If 24 VAC is present, check the gas valve
and gas supply.
B. If 24 VAC is not present, replace the spark
ignition control.
12
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
ELECTRONIC CONTROL
SPECIAL KEY FUNCTIONS - To activate these
functions press the specified keys while turning the
oven on. You can not toggle between functions.
Each function has to be entered from the off
position.
NOTE: There are four hidden keys on the control.
See diagram following the table.
HOLD KEYS
FUNCTION
1 & 3
4 & 9
6 & 8
Calibration Mode
Change between C & F
Display test
CALIBRATE OVEN - Perform Calibration at 350 F
1. Place a thermocouple near the geometric
center of the oven cavity.
2. Cycle oven until the cavity temperature stabiliz-
es. (usually 3 cycles)
3. Turn the oven off.
4. Enter the calibration mode.
5. Compare the set temperature to the measured
temperature.
6. Adjust the temperature on the display to match
the measured temperature.
7. Press key 3 to store the calibration information.
DISPLAY TEST - The control will cycle through a
continuous test until the oven is turned off. Each
segment of the displays will be lit in sequence, each
LED in order and then each digit will light.
ERROR CODES
CODES
CONDITIONS
E-01
E-02
High Limit Error - Check open probe.
Low Limit Error - check for 6 VAC from transformer.
Check control pins 1-2 for 12 VAC & pins 2-3.
E-03
E-04
Control compartment ambient temperature is above 215 F
Control compartment ambient temperature is below 32 F
13
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
SOLID STATE CONTROL
CALIBRATION
SOLID STATE CONTROL
TEST
1. Place a thermocouple in the geometric center
of the oven cavity.
Oven temperature must be below 450 F.
NOTE:
1. Remove the screws from the control panel and
pull the control panel away from the oven to
access the control wiring.
2. Set the On-Off-Cool Down switch to ON.
3. Set the temperature control to 350 degrees F.
2. Place a thermocouple in the geometric center
of the oven cavity.
4. Allow the oven to cycle until the oven
temperature stabilizes. (cycle at least three
times)
3. Set the temperature to the maximum setting.
4. Turn the power switch to ON.
5. Record the temperature at which the HEAT
LIGHT goes off and on.
A. Check for at least two complete heating
cycles.
6. Calculate the differential by subtracting the
temperature indicated when the heat light
comes on from the temperature indicated when
the heat light goes out.
Differential = Heat light OFF - Heat light ON.
5. Check for supply voltage across:
200-240 volts - pin 10 to pin 6
120 volts - pin 9 to pin 6
Example: 360 (light out) - 340 (light on) = 20 F
differential.
A. The differential calculated should be
less than 20 degrees F.
A. If correct, proceed to step 7.
B. If incorrect, go to step 6.
(1) If the differential is more than 20
degrees F, check temperature
probe and temperature control
board as outlined under
6. Check for supply voltage across:
200-240 volts - pin 7 to pin 10 and pin 8 to pin
10
120 volt - pin 7 to pin 9 and pin 8 to pin 9
"TEMPERATURE PROBE
TEST" and "SOLID STATE
CONTROL TEST".
A. If correct, proceed to step 7.
B. If incorrect, problem is not with the
temperature control. Return to Trouble-
shooting Guide.
7. Calculate the average temperature by adding
the temperature indicated when the heat light
goes out to the temperature indicated when the
heat light comes on and dividing this answer by
2.
7. Turn the temperature control to the minimum
setting.
Oven temperature must be above 300 F.
NOTE:
[Temp.(light off)+ Temp.(light on)] ÷ 2 = Average
Temperature
8. Check for zero (O) Volts across:
200-240 volts - pin 6 to pin 10
120 volt - pin 6 to pin 9
Example: (360 + 340) ÷ 2 = 700 ÷ 2 = 350 F
average temperature
A. If correct the problem is not with the
temperature control. Return to Trouble-
shooting Guide.
B. If incorrect, replace the temperature
control.
14
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
8. If the average temperature differs more than 10
degrees F from the dial settings:
DOOR SWITCH
ADJUSTMENT
A. Pencil mark the knob pointer position as a
reference point on the control panel next
to the dial plate.
WARNING: DISCONNECT THE ELECTRICAL
B. Remove the temperature control knob.
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. Remove the upper front cover as outlined
under "COVERS AND PANELS".
2. The door switch actuator should be operated by
the switch lever when the door is about ½" from
being closed.
3. If adjustment is necessary, use the following
procedures.
A. Loosen the two switch mounting screws.
B. Adjust the switch bracket to obtain the
C. Loosen the two dial plate mounting screws
correct setting as outlined in step 2.
and the temperature control mounting nut.
Loosen only enough to turn the dial plate.
C. Tighten the two switch bracket mounting
screws.
D. If the adjustment can not be obtained by
moving the switch, you can bend the tab
of the actuator lever.
D. Rotate the dial plate until the temperature
4. Install the upper front cover.
calculated in step 7 is in line with the
pencil mark.
E. If the above adjustment cannot be
obtained, check temperature probe and
temperature control board as outlined
under "TESTING TEMPERATURE
CONTROL BOARD".
15
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
DOOR REVERSAL
7. Remove the door switch from the switch
mounting bracket.
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
A. Use the other set of holes in the mounting
bracket to mount the switch.
1. Remove the door as outlined under “OVEN
DOOR”.
A. Remove the door strike plate from the top
of the door.
B. Rotate the door 180°. The top of the door
is now the bottom.
B. Place the switch insulation pad on the
mounting bracket.
C. Install the door strike on the new top of the
door. Use the screws removed to install
the strike plate to fill the holes on the
bottom of the door.
2. Remove the bottom door bushing and anti-
rotation plate.
3. Remove the knockout from the lower sill cover.
C. Install the switch onto the mounting
bracket.
4. Install the plug button in the old door bushing
hole in the lower sill cover.
5. Install the bottom door bushing and anti-
rotation plate.
6. Remove the catch assembly from the oven.
A. Move the door catch to the opposite side
of the door catch channel.
B. Install the door catch assembly to the
opposite side of the top sill.
8. Install the door in the lower door bushing.
9. Install the top door bushing and door switch
mounting plate to the new position on the upper
sill.
10. Adjust the door as outlined under “DOOR
ADJUSTMENT”.
11. Adjust the door switch as outlined under
“DOOR SWITCH ADJUSTMENT”.
12. Replace the top front cover and check the oven
for proper operation.
16
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HALF-SIZE GAS CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
DOOR ADJUSTMENT
BLOWER ADJUSTMENT
WARNING: UNPLUG UNIT BEFORE SERVICING.
WARNING: DISCONNECT THE ELECTRICAL
POWER TO THE MACHINE AT THE MAIN
CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT
BOX INDICATING THE CIRCUIT IS BEING
SERVICED.
1. The door should be parallel with the face of the
oven cavity.
1. Remove rack and rack supports.
2. Remove baffle panel by lifting up and out.
3. Check the blower. It should be ¼" away from
and parallel to the oven wall. If not, proceed to
step 4.
2. If adjustment is needed:
4. Remove the right side panel as outlined under
“COVERS AND PANELS”.
A. Remove the top front cover as outlined
under “COVERS AND PANELS” in
“REMOVAL AND REPLACEMENT OF
PARTS”.
5. To adjust the blower at the sides (front and rear
of oven cavity), loosen the motor mounting
bolts and move the motor until the ¼" gap is
obtained.
B. Loosen the screws that secure the door
support and move the door in the slot until
it is parallel with the face of the oven
cavity.
6. To adjust the blower at the top and bottom,
place shims between the motor mounting
bracket and the mounting base.
7. Reverse the procedure to install.
HEATING ELEMENT TEST
C. Tighten the screws and install the top front
cover.
Test each rod in the element assembly.
Values in the table are nominal (± 10%).
VOLTAGE
208
WATTS
2500
AMPS
12
RESISTANCE
17.33
240
2500
10.4
23.1
17
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
ELECTRICAL OPERATION
COMPONENT FUNCTION
POWER SWITCH . . . . . . . . . . . . . Controls power to oven.
COOLDOWN SWITCH . . . . . . . . . Prevents heaters from operating and allows fan to run. (On some solid state
control models, this switch is combined with the power switch)
FAN SPEED SWITCH . . . . . . . . . . Controls speed of oven cavity blower motor. (Electric ovens)
SOLID STATE CONTROL . . . . . . . Controls oven temperature.
TIMER . . . . . . . . . . . . . . . . . . . . . Signals end of timed baking. Does not shut heater or burner off. (Solid state
control)
ELECTRONIC CONTROL . . . . . . . Controls oven temperature, cook and hold mode, pulse mode and time.
BLOWER MOTOR . . . . . . . . . . . . Circulates air inside oven cavity. (Contains centrifugal switch for gas ovens)
(2 speed electric ovens)
DOOR SWITCH . . . . . . . . . . . . . . Allows heating of oven, only when the doors are closed.
TEMPERATURE PROBE . . . . . . . Senses temperature of oven cavity for the solid state control and electronic
control.
SOLID STATE RELAY . . . . . . . . . Controls power to blower motor. (Electronic Control)
TRANSFORMER . . . . . . . . . . . . . . Provides 12 and 6 VAC power. (Electronic Control)
TRANSFORMER . . . . . . . . . . . . . . Provides 24 VAC power to the spark ignition control if the centrifugal switch
(part of blower motor) is closed. (Gas Ovens)
GAS VALVE . . . . . . . . . . . . . . . . . Allows gas to flow to burner. (Gas ovens)
SPARK MODULE . . . . . . . . . . . . . Generates spark for burner ignition, monitors flame, controls 15 second
purge
time and 10 second ignition time and power to gas valve. (Gas ovens)
POWER LIGHT . . . . . . . . . . . . . . . Lit whenever the power switch is ON. (Solid state control)
HEAT LIGHT . . . . . . . . . . . . . . . . . Lit whenever burner or heaters are operating. (Solid state control)
NO IGNITION LIGHT . . . . . . . . . . Lit when sensor fails to detect flame. (Solid state control - Gas oven)
CONTACTOR . . . . . . . . . . . . . . . . Powers heater elements. (Electric ovens)
FUSE . . . . . . . . . . . . . . . . . . . . . Protects control circuit. (Electric ovens)
18
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
COMPONENT LOCATION
19
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
Gas Oven
SEQUENCE OF OPERATION
NOTE:
A combination of terminal numbers and wire
numbers will be used to describe the circuit paths. The
complete path will be described when a component is
energized.
Ignition Module
1. 24VAC supplied to ignition module as described
under oven sequence of operation
A. 15 second prepurge period
Solid State Control (Gas)
NOTE:
Use GCO2D Schematic
1) No-ignition light is on
2) Cavity blower motor removes any
residual gas from combustion chamber
1.
Conditions
A. Supply voltage to unit
B. 10 second spark period
1) L1 to power switch: wire #1; J1-1; wire #1
2) L2 to power switch: wire #2; J1-2; wire #2
3) Good chassis ground for:
1) Gas valve energized
2) No-ignition light is off
a.
b.
Ignition module: GND
No ignition light: wire #48; GND;
wire #6; J1-6; wire #6; GND
Gas valve: wire #48; GND;
Ignition transformer: GND
2.
The flame is monitored by a DC voltage of at least 5
microamps passing from the ignitor probe through
the flame to ground.
c.
d.
A. If the flame is detected before 10 seconds:
B. Power switch off
C. Oven at room temperature
D. Temperature control off
E. Manual gas valve open
F. Door switch closed
G. Cooldown switch off
H. Timer off
1) Sparking is terminated
2) Gas valve held open
3) Monitoring of flame continues
B. If a flame is not established after the 10
second spark period
2.
Power switch turned "on" (voltage at terminals of
power switch)
A. Power On lamp lights: wire #34/J1; wire
#41/37
1) a second 15 second prepurge period
2) A second 10 second spark period
C. If a flame is not established after the second
10 second spark period
B. Control powered: wire #34; wire #33/3; J1-3;
wire #3; door switch; wire #27/4; J1-4; wire
#4/36/35; terminal 8; terminal 9 (120 VAC) or
terminal 10 (200-240 VAC); wire #39/37
C. Blower motor energized: wire #34; wire #33/3;
J1-3; wire #3; door switch; wire #27/4; J1-4;
wire #4/11; J1-11; wire #11; wire #13/7; J1-7;
wire #7/37
1) a third 15 second prepurge period
2) A third 10 second spark period
D. If a flame is not established after the third 10
second spark period, the module will go into
lock out
1) Blower motor reaches operating speed,
blower motor centrifugal switch closes
1) No ignition light on
3.
To reset the ignition module perform one of the
following
3.
Control set to cook temperature, contacts 6/7 close
A. Turn power switch off; then on
A. Ignition transformer primary powered: terminal
6; wire #9; J1-9; wire #9; BK/BL wire; WH/BK
wire; wire #7; J1-7; wire #7/37
B. Open and close the door
C. Turn the temperature control all the way off
then back to the set temperature
B. Heating lamp lights: terminal 6; wire #43; wire
#42/37
4.
If a flame is established then is extinguished before
the temperature control is satisfied, the no ignition
light will be on and the ignition module will attempt
to light the burner in the sequence described above.
4.
5.
24 VAC from ignition transformer secondary to
ignition module: transformer secondary wire #52;
centrifugal switch; wire #54; terminal 24V of control
module; GND
Ignition module operates (see ignition module
sequence of operation)
20
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
6.
Temperature is satisfied and control contacts 6/7
open
Electronic Control (Gas)
A. Heat light goes out.
B. Power removed from ignition transformer.
NOTE: Use GCO2C Schematic
NOTE: A combination of terminal numbers and wire
numbers will be used to describe the circuit paths. The
complete path will be described when a component is
energized.
7.
8.
Ignition module de-energized
A. Gas valve de-energized, gas supply to burner
off.
Oven cycles on solid state control until power switch
is moved from the "on" position or the door is
opened.
Heat
1.
Conditions.
NOTE: The blower motor, heat lamp and gas valve
are de-energized when the door is opened during
the heat mode.
A. Supply voltage to unit.
1) L1 to power/cooldown switch: wire #1;
J1-1; wire #1
2) L2 to:
Solid State Timer (Gas)
a.
b.
c.
Motor: wire #2; J1-2; wire #2; J1-7;
wire #7/13
Primary of ignition transformer: wire
#2; J1-2; wire #2; J1-7; wire #7
Primary of control transformer: wire
#2; J1-2; wire #2; J1-7; wire #7/97
NOTE: Use GCO2D Schematic
NOTE: The timer is not connected to the heating circuit
and will not prevent the oven from heating when time
expires.
3) Good chassis ground: ignition module
transformer
1.
2.
Power switch on
a.
b.
Ignition module: GND
Electronic control: terminal 8 of
control; J2-8; J1-6; wire #6; GND
Gas valve: wire #48; GND
Ignition transformer: GND
Time dialed into timer, contacts 1/3 close.
c.
d.
A. Timer motor energized: wire #34/64; timer
contacts 1/3; wht wire; wire #37
B. Power/cooldown “off".
C. Oven at room temperature.
D. Door switch closed.
3.
Time expires.
A. Contacts 1/3 open
E. Manual gas valve open.
1) Timer motor de-energized
2.
3.
Power/cooldown switch turned "on"
B. Contacts 1/4 close
A. Control transformer primary powered: wire
#26/4; J1-4; wire #4/94; wire #97/7; J1-7; wire
#2; J1-2; wire #2; L2
4.
5.
Buzzer sounds: wire #34/64; timer contacts 1/4; wire
#66; wire #65/37
Timer turned to off.
Control powered from secondary of control
transformer:
A. Contacts 1/4 open
1) buzzer de-energized
A. 6 VAC - wire #16; J1-16; J2-3; J2-2; J1-15;
wire #15
B. 12 VAC - wire #14; J1-14; J2-1; J2-2; J1-15;
wire #15
Cooldown (Gas/Solid State Control)
NOTE: Use GCO2D Schematic
4.
Control set to desired temperature
1.
2.
Conditions
A. Control verifies heat mode: 16 to 18 VDC
output on J2-11; J1-20; wire #20/21;
A. Oven temperature needs to be lowered.
B. Power switch on
power/cooldown switch; contacts of switch are
open and no return voltage to J2-5
Cooldown switch on
B. Control verifies that door is closed: 16 to 18
VDC output on J2-11; J1-20; wire #20/27; door
switch; wire #3; J1-3; J2-4
A. Blower motor energized: power switch; wire
#34/33/36/11; J1-11; wire #11; wire #13/7; J1-
7; wire #7/37; power switch
21
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
After verification of heat mode and door closed:
5.
Cook and Hold
A. Ignition transformer primary powered: wire
#26/43; J2-13; J2-15; J1-5; wire #5; BK/BL
wire; WH/BK wire; wire #7; J1-7; wire #2; J1-
2; Wire #2; L2
1.
Conditions
A. Oven in preheat.
A bake temperature and time is set.
1) 24 VAC from secondary of ignition
transformer to ignition module: wire #52;
centrifugal switch; wire #54; terminal 24V
of control module; GND
2.
3.
A hold temperature and time is set and start key
pressed.
B. Solid state relay energized: 16 to 18 VDC
output on J2-11; J1-20; wire #20; wire #19;
J1-19; J2-10
4.
Oven cycles at set temperature.
NOTE: In pulse mode (initiated at the beginning of the
bake cycle), the blower motor is operated in 45 second
cycles, with the first cycle being off then 45 seconds on.
The pulse time cannot be longer than the bake time.
1) Blower motor energized: wire #26/4; J1-4;
wire #4/34; ss relay contacts; wire #9; J1-
9; wire #11; J1-11; wire #11; wire #13/7;
J1-7; wire #2; J1-2; Wire #2; L2
5.
Time expires in cook mode.
a.
Blower motor reaches operating
speed, blower motor centrifugal
switch closes
A. Buzzer sounds (short beep).
B. Control lowers temperature to hold
temperature.
6.
7.
Ignition module operates (see ignition module
sequence of operation)
6.
7.
Oven temperature reaches hold temperature.
A. Display counts up time and flashes "hold"
Oven cycles on electronic control until
power/cooldown switch is moved from the "on"
position, a different mode is selected or the door is
opened.
NOTE: The blower motor is de-energized and gas
valve closed when the door is opened while the oven
is in the heat mode.
Oven continues to cycle at hold temperature until
oven is turned off or the hold function is turned off.
NOTE: The blower motor and gas valve are de-
energized when the door is opened while the oven is
in the hold mode.
Cook
Cooldown (Gas/Electronic Control)
1.
Conditions
NOTE: Use GCO2C Schematic
A. Oven in preheat.
1.
2.
3.
Conditions
2.
3.
4.
Temperature is set.
A. Cooking completed, oven temperature needs
to be lowered.
B. Power/cooldown switch on
Time is set and start key pressed.
Oven cycles at set temperature.
Power/cooldown switch to cooldown
NOTE: In pulse mode (initiated at the beginning of
the bake cycle), the blower motor is operated in 45
second cycles, with the first cycle being off then 45
seconds on. The pulse time cannot be longer than
the bake time.
A. Control transformer primary powered: wire
#26/4; J1-4; wire #4/94; wire #97/7; J1-7; wire
#2; J1-2; wire #2; L2
Control powered from secondary of control
transformer:
5.
6.
Time expires.
A. 6 VAC - wire #16; J1-16; J2-3; J2-2; J1-15;
A. Buzzer sounds continually until turned off.
wire #15
B. 12 VAC - wire #14; J1-14; J2-1; J2-2; J1-15;
wire #15
Oven continues to cycle at set temperature.
NOTE: The blower motor and gas valve are de-
energized when the door is opened while the oven is
in the cook mode.
4.
Control verifies cooldown mode: 16 to 18 VDC
output on J2-11; J1-20; wire #20/21;
power/cooldown switch; wire #29; J2-5
22
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
5.
After verification of cooldown mode:
B. Control powered: wire #34; wire #33/3; J1-3;
wire #3; door switch; wire #27/4; J1-4; wire
#4/36/35; terminal 8 and 7; terminal 9 (120
VAC) or terminal 10 (200-240 VAC); wire
#39/37
A. Solid state relay energized: 16 to 18 VDC
output on J2-11; J1-20; wire #20; wire #19;
J1-19; J2-10
1) Blower motor energized: wire #26/4; J1-
4; wire #4/34; ss relay contacts;; wire # 9;
J1-9; wire #11; J1-11; wire #11; wire
#13/7; J1-7; wire #2; J1-2; wire #2; L2
C. Blower motor energized: wire #34; wire #33/3;
J1-3; wire #3; door switch; wire #27/4; J1-4;
wire #4; motor speed switch; wire #11 high or
12 low ); J1-(11 high or 12 low); wire #(11 high
or 12 low); wire #13/7; J1-7; wire #7/37
B. Contactor coil will not be energized.
C. The door position signal is not read.
3.
Control set to cook temperature contacts 6/7 close
Electric Oven
NOTE:
numbers will be used to describe the circuit paths. The
complete path will be described when a component is
energized.
A. Contactor coil energized: terminal 6; wire
#9; J1-9; wire #9/50; wire #52/7; J1-7;
wire #7/37
B. Heating lamp lights: terminal 6; wire #43;
wire #42/37
A combination of terminal numbers and wire
Solid State Control (Elec)
4.
5.
Heating elements energized
NOTE:
Use ECO2D Schematic
A. L1; wire #61; C1; Wire #70; wire #75; C3; Wire
#64; L3
1.
Conditions.
B. L1; wire #61; C1; Wire #74; wire #71; C2; Wire
#62; L2
A. Fuses are good.
Oven reaches set temperature and control contacts
6/7 open
B. Supply voltage to unit (three phase)
1) L1 to power switch: wire #1; J1-1; fuse;
wire #1A and one side of heater contacts
C1: wire #61
A. Power removed from contactor coil
1) Heating elements de-energized
B. Heating lamp goes out.
2) L2 to one side of heater contacts C2: wire
#62
6.
Oven cycles on solid state control until power switch
is moved from the "on" position or the door is
opened.
3) L3 to power switch: wire #2; J1-2; fuse;
wire #2A and one side of heater contacts
C31: wire #64
NOTE:
The blower motor and heating elements are
de-energized when the door is opened and the oven
is in the heat mode.
4) Good chassis ground
C. Power switch "off"
Solid State Timer (Elec)
NOTE:
Use ECO2D Schematic
D. Oven at room temperature
E. Solid state control off
F. Door switch closed
NOTE:
The timer is not connected to the heating circuit
and will not prevent the oven from heating when time
expires.
1.
2.
Power switch on
G. Fan speed switch in either position
H. Cooldown switch off
Time dialed into timer, contacts 1/3 close.
A. Timer motor energized: wire #34/64; timer
contacts 1/3; wht wire; wire #37
J.
Timer off
2.
Power switch turned "on" (voltage at terminals of
power switch)
3.
Time expires.
A. Contacts 1/3 open
A. Power On lamp lights: wire #34/J1; wire
#41/37
1) Timer motor de-energized
B. Contacts 1/4 close
23
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
4.
5.
Buzzer sounds: wire #34/64; timer contacts 1/4; wire
#66; wire #65/37
C. Power/cooldown switch "off"
D. Oven at room temperature
E. Door switch closed
Timer turned to off.
F. Fan speed switch in either position
A. Contacts 1/4 open
1) buzzer de-energized
2.
3.
Power/cooldown switch turned "on"
A. Control transformer primary powered: wire
#26/4; J1-4; wire #4/94; wire #97/7; J1-7; wire
#7/2A; fuse; J1-2; wire #2; L3
Cooldown (Elec/Solid State Control)
NOTE:
Use ECO2D Schematic
Control powered from secondary of control
transformer:
1.
Conditions
A. 6 VAC - wire #16; J1-16; J2-3; J2-2; J1-15;
A. Cooking completed, oven temperature needs
to be lowered.
wire #15
B. 12 VAC - wire #14; J1-14; J2-1; J2-2; J1-15;
wire #15
B. Power switch on
Cooldown switch on
4.
Control set to desired temperature
2.
A. Control verifies heat mode: 16 to 18 VDC
output on J2-11; J1-20; wire #20/21; J1-21;
power/cooldown switch; contacts of switch are
open and no return voltage to J2-5
A. Blower motor energized: power switch; wire
#34/33/36/ motor speed switch; wire #11 high
or 12 low ); J1-(11 high or 12 low); wire #(11
high or 12 low); wire #13/7; J1-7; wire #7/37;
power switch
B. Control verifies that door is closed: 16 to 18
VDC output on J2-11; J1-20; wire #20/27; door
switch; wire #3; J1-3; J2-4
Electronic Control (Elec)
NOTE:
Use ECO2C Schematic
5.
After verification of heat mode and door closed,
NOTE:
A combination of terminal numbers and wire
A. Solid state relay energized: 16 to 18 VDC
output on J2-11; J1-20; wire #20; wire #19;
J1-19; J2-10
numbers will be used to describe the circuit paths. The
complete path will be described when a component is
energized.
1) Blower motor energized: wire #26/4; J1-
4; wire #4/34; ss relay contacts;; wire #
(11 high or 12 low ); J1-(11 high or 12
low); wire #(11 high or 12 low); wire
#13/7; J1-7; wire #7/37
Heat
1.
Conditions
B. Contactor coil energized: wire #43; J2-13; J2-
15; J1-5; wire #5; wire #50/7; J1-7; wire
#7/2A; fuse; J1-2; Wire #2; L3
A. Fuses are good.
1) Heating elements energized
B. Supply voltage to unit (three phase)
a.
b.
L1; wire #61; C1; Wire #70; wire
#75; C3; Wire #64; L3
L1; wire #61; C1; Wire #74; wire
#71; C2; Wire #62; L2
1) L1 to power/cooldown switch: wire #1;
J1-1; fuse; wire #1A/1 and one side of
heater contacts C1: wire #61
2) L2 to one side of heater contacts C2: wire
#62
6.
7.
Oven reaches set temperature
3) L3 to:
A. Power removed from contactor coil
1) Heating elements de-energized
a.
Motor: wire #2; J1-2; fuse; wire
#2A/7; J1-7; wire #7/13
Oven cycles on electronic control until
power/cooldown switch is moved from the "on"
position or the door is opened.
The blower motor and heating elements are
de-energized when the door is opened and the oven
is in the heat mode.
b.
c.
Contactor coil: wire #2; J1-2; fuse;
wire #2A/7; J1-7; wire #7/50
Primary of control transformer: wire
#2; J1-2; fuse; wire #2A/7; J1-7;
wire #7/97
NOTE:
d.
one side of heater contacts C3: wire
#64
4) Good chassis ground electronic control:
terminal 8 of control; J2-8; J1-6; wire #6;
GND
24
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
Cook
Cooldown (Elec/Electronic Control)
NOTE:
Use ECO2C Schematic
1.
Conditions
A. Oven has reached set temperature in heat
mode
Time is set and start key pressed.
Oven cycles at set temperature.
1.
2.
3.
Conditions
2.
3.
A. Cooking completed, oven temperature needs
to be lowered.
B. Power/cooldown switch on
NOTE:
In pulse mode (initiated at the beginning of
the bake cycle), the blower motor is operated in 45
second cycles, with the first cycle being off then 45
seconds on. The pulse time cannot be longer than
the bake time.
Power/cooldown switch to cooldown
A. Control transformer primary powered: wire
#26/4; J1-4; wire #4/94; wire #97/7; J1-7; wire
#7/2A; fuse; J1-2; wire #2; L3
4.
5.
Time expires.
A. Buzzer sounds continually.
Control powered
Oven continues to cycle at set temperature.
A. 6 VAC from secondary of control transformer -
wire #16; J1-16; J2-3; J2-2; J1-15; wire #15
B. 12 VAC from secondary of control transformer
- wire #14; J1-14; J2-1; J2-2; J1-15; wire #15
NOTE:
The blower motor and heaters are de-
energized when the door is opened and the oven is
in the cook mode.
Cook and Hold
4.
5.
Control verifies cooldown mode: 16 to 18 VDC
output on J2-11; J1-20; wire #20/21;
power/cooldown switch; wire #29; J2-5
1.
Conditions
A. Oven has reached set temperature in heat
mode
After verification of cooldown mode:
A. Solid state relay energized: 16 to 18 VDC
output on J2-11; J1-20; wire #20; wire #19;
J1-19; J2-10
2.
3.
A bake temperature and time is set.
A hold temperature and time is set and start key
pressed.
1) Blower motor energized: wire #26/4; J1-
4; wire #4/34; ss relay contacts;; wire #
(11 high or 12 low ); J1-(11 high or 12
low); wire #(11 high or 12 low); wire
#13/7; J1-7; wire #7/37
4.
Oven cycles at set temperature.
NOTE:
In pulse mode (initiated at the beginning of
the bake cycle), the blower motor is operated in 45
second cycles, with the first cycle being off then 45
seconds on. The pulse time cannot be longer than
the bake time.
B. Contactor coil will not be energized.
C. The door position signal is not read.
5.
Time expires in cook mode.
A. Buzzer sounds (short beep).
B. Control lowers temperature to hold
temperature.
6.
7.
Oven temperature reaches hold temperature.
A. Display counts up time and flashes "hold"
Oven continues to cycle at hold temperature until
oven is turned off or the hold function is turned off.
NOTE:
The blower motor and heating elements are
de-energized when the door is opened and the oven
is in the hold mode.
25
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
SCHEMATICS GAS OVENS
GCO2D
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
GCO2C
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
WIRING DIAGRAM - GAS
OVENS
GCO2D - Control Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
GCO2D - Oven Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
GCO2C - Control Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
GCO2C - Oven Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
SCHEMATIC-ELECTRIC OVENS
ECO2D
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
ECO2C
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
WIRING DIAGRAM ELECTRIC OVENS
ECO2D - Control Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
ECO2D - Oven Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
ECO2C - Control Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
ECO2C - Oven Section
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HALF-SIZE CONVECTION OVENS - ELECTRICAL OPERATION
TROUBLESHOOTING
ELECTRIC OVENS
SYMPTOM
POSSIBLE CAUSES
No power to oven controls.
1. Main breaker open.
2. Control circuit fuses open.
3. 12/6 volt transformer inoperative. (Electronic
control)
No oven operation; power to controls.
1. Door switch open.
2. Temp. control malfunction.
Blower motor operates when oven is heating, but not
in cooldown.
1. Cooldown switch inoperative (solid state
control).
Blower motor does not operate, oven heats.
1. Door switch open or inoperative.
2. Speed selection switch malfunction.
3. Blower motor inoperative.
4. Solid state relay malfunction. (Electronic
Control)
5. Electronic control inoperative. (Electronic
Control)
Oven is slow to heat or not hot enough.
1. Incorrect line voltage.
2. One phase of 3 phase out.
3. Thermostat or control malfunction.
4. Blower motor inoperative.
5. Contactor malfunction.
6. Temperature probe malfunction.
Oven temperature is too hot.
1. Thermostat or control not calibrated.
2. Thermostat or control malfunction.
3. Contactor inoperative.
No heat; blower motor operates.
1. Thermostat or control inoperative.
2. Contactor malfunction.
3. Heaters open.
Electronic control does not function.
1. See "ELECTRONIC CONTROL" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
Door does not seal or will not shut properly.
1. Doors out of adjustment.
2. Door seals inoperative.
3. Door catch malfunction.
38
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HALF-SIZE CONVECTION OVENS - TROUBLESHOOTING
GAS OVENS
SYMPTOM
POSSIBLE CAUSES
No power to oven controls.
1. Unit unplugged
2. Power switch inoperative.
3. 12/6 volt transformer inoperative. (Electronic
control)
No oven operation; power to controls.
Gas does not ignite; no spark.
1. Door switch open or inoperative.
2. Solid state relay malfunction. (Electronic
control)
3. Blower motor malfunction.
4. Electronic control malfunction.
1. 24 volt transformer not functioning.
2. Spark ignition control inoperative or not
grounded.
3. Solid state control or probe malfunction.
4. Electronic control or probe inoperative.
5. Centrifugal switch in blower motor inoperative.
Oven is slow to heat or not hot enough.
1. Gas pressure not correct.
2. Control malfunction.(solid state or electronic)
4. Probe inoperative.
5. Blower motor malfunction.
6. Check orifice.
Gas ignites, but will not maintain flame.
Sparks but does not ignite.
1. Insufficient gas pressure.
2. Flame sensor not positioned in flame.
3. Spark ignition control malfunction.
4. Check orifice.
1. Manual gas valve off.
2. Gas valve malfunction.
3. Spark ignition control inoperative.
Electronic control does not function.
1. See "ELECTRONIC CONTROL" in "SERVICE
PROCEDURES AND ADJUSTMENTS".
Door does not seal or will not shut properly.
1. Doors out of adjustment.
2. Door seals inoperative.
3. Door latch malfunction.
39
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Form 24575 (12/96)
Printed in U.S.A.
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