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TROUBLESHOOTING
Ignition Control Module (ICM) LED Error Codes: (Flashes visible through viewport in access door)
FLASHES
1
2
3
4
5
6
8
9
Rapid
SL (Soft Lockout): Control Automatically resets after 60 minutes.
SL3 (Soft Lockout/Hard Lockout): Control automatically resets after 60 minutes, with a maximum of 3 resets, followed by hard lockout requiring service.
SC (Self Clearing): Control will function normally as soon as it no longer detects the previously indicated fault.
* when pressure switch or blower relay opens
** when flame is no longer sensed.
† Blower Isolation Relay is used on models 150,000 BTU/Hr and above.
Note: If unit goes into a soft or hard lock-out the ignition control module can be reset by cycling power to the water heater.
26
Table 5:
INDICATED PROBLEM
Pressure Switch Closed
Pressure Switch Open
Failed Ignition
Gas Valve Hardware Fault
Flame Sense Hardware Fault
False Flame
Ignition Control Hardware Fault
Ignition Control Software Fault
L1 Polarity Detection
CONTROL REACTION
SC*
SL
SL3
SL
SC
SL**
SL
SL
SC
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