70422201R1
59
Hybrid Timer Control Troubleshooting
37.Unit Will Not Heat – Gas (continued)
Please see following page for wiring diagram information.
TMB2358S-b
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
(11)
(12)
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
NO
YES
Unit operational.
Is there a flame?
YES
NO
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