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TROUBLESHOOTING
Table 5:
Ignition Control Module (ICM) LED Error Codes: (Flashes visible through viewport in access door)
FLASHES INDICATED PROBLEM CONTROL REACTION
1 Pressure Switch Closed SC*
2 Pressure Switch Open SL
3 Failed Ignition SL3
4 Gas Valve Hardware Fault SL
5 Flame Sense Hardware Fault SC
6 False Flame SL**
8 Ignition Control Hardware Fault SL
9 Ignition Control Software Fault SL
Rapid L1 Polarity Detection SC
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.