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Electronic Control Troubleshooting
42. Will Not Heat – Electric/Gas – OPL Microprocessor (continued)
T012D
Correct wiring
between cabinet
limit and terminal
5 of fan motor
centrifugal switch.
Is there voltage to the
input of the cabinet
limit?
Replace cabinet
limit.
Is there voltage to
output of cabinet limit?
Correct wiring
between stove limit
and cabinet limit.
Is there voltage to input
of stove limit?
Replace stove limit.
Is there voltage to the
output side of the stove
limit?
Correct wiring
between ICM board
and stove limit.
Is there voltage to
terminal 2 of ICM
board?
Replace ICM board.
Is there voltage to
terminal 1 of ICM
board?
Correct wiring to
gas valve coils.
Is there voltage across
the coils of the gas
valve?
Replace the coils or
complete gas valve.
Is there gas flow
through the valve?
Unit is operational.
Is there a flame?
Continued from column 2 of
previous page.
NO
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
YES
NO
NO
YES
YES
Check gas
pressures and
adjust if necessary.
Does the ignitor spark?
Replace igniter or
ignition cable.
YES
NO
Is the unit equipped
with gas heat or
electric heat?
GAS
Is there voltage across
HC1 & HC2 coils?
Do the elements
produce heat?
Correct the wiring
to the HC1 and/or
HC2 coils.
Correct wiring
between supply,
contacts and
elements. Replace
contactors and/or
elements if
necessary.
UNIT
OPERATIONAL.
ELECTRIC
NO
YES
NO
YES
T012D