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Hybrid Timer Control Troubleshooting
40. Unit Will Not Heat – Gas – OPL Models (continued)
Please see following page for wiring diagram information.
TMB2006S
Replace ICM board.
Is there voltage at
terminal 1 of ICM
board?
Correct wiring
between gas valve
and ICM board.
Is there voltage across
the coils of the gas
valve?
NO
YES
YES
NO
(13)
(14)
(15)
Note: Make sure unit is
not in a lock out
condition.
Replace gas valve
coils or complete
gas valve.
Is there gas flow
through the gas valve?
Replace high
voltage ignition
cable or igniter.
Does the igniter spark?
NO
YES
Replace airflow
switch
Is the airflow switch
working properly?
NO
YES
NO
YES
Unit operational.
Is there a flame?
YES
NO
TMB2006S
Содержание YT025E
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