Alliance Laundry Systems CA050L - Page 63

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Micro Display Control (MDC) Troubleshooting
37.Unit Will Not Heat – Gas (continued)
Please see following page for wiring diagram information.
Replace the stove
limit.
Is there
24 VAC at output side of
the stove limit?
Correct wiring
between terminal 2
of ICM and stove
limit.
Is there 24 VAC to
terminal 2 of
the Ignition Control
Module (ICM)?
Replace ICM board.
Is there 24 VAC at
terminal 1 of ICM
board?
Correct wiring
between gas valve
and ICM board.
Is there 24 V
AC across
the coils of the gas
valve?
Replace gas valve
coils or complete
gas valve.
Is there gas flow
through the gas valve?
Replace high
voltage ignition
cable, igniter or
ICM board.
Does the igniter spark?
Unit operational. Is there a flame?
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
(12)
(13)
(14)
(15)
Note: Make sure unit is
not in a lock out
condition.
TMB2307S-b
TMB2307S-b