ALLIANCE T30 Series Troubleshooting Manual page 81

42. Will Not Heat – Electric/Gas – OPL Microprocessor (continued)
Continued from column 2 of
previous page.
Is there voltage to the
input of the cabinet
limit?
YES
Is there voltage to
output of cabinet limit?
YES
Is there voltage to input
of stove limit?
YES
Is there voltage to the
output side of the stove
limit?
YES
Is the unit equipped
with gas heat or
electric heat?
GAS
Is there voltage to
terminal 2 of ICM
board?
YES
70291301
Correct wiring
between cabinet
NO
limit and terminal
5 of fan motor
centrifugal switch.
NO
Replace cabinet
limit.
Correct wiring
NO
between stove limit
and cabinet limit.
NO
Replace stove limit.
ELECTRIC
Correct wiring
NO
between ICM board
and stove limit.
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Electronic Control Troubleshooting
Is there voltage to
terminal 1 of ICM
board?
YES
Is there voltage across
the coils of the gas
valve?
YES
Is there gas flow
through the valve?
YES
Is there a flame?
NO
Does the ignitor spark?
NO
Replace igniter or
ignition cable.
Is there voltage across
HC1 & HC2 coils?
YES
Do the elements
produce heat?
YES
UNIT
OPERATIONAL.
NO
Replace ICM board.
NO
Correct wiring to
gas valve coils.
NO
Replace the coils or
complete gas valve.
YES
Unit is operational.
Check gas
YES
pressures and
adjust if necessary.
Correct the wiring
NO
to the HC1 and/or
HC2 coils.
Correct wiring
between supply,
contacts and
NO
elements. Replace
contactors and/or
elements if
necessary.
T012D
T012D
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