TROUBLESHOOTING
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
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