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ICP Furnace Error Codes - Complete Guide

ICP (International Comfort Products) is the parent company for Heil, Tempstar, Comfortmaker, Keeprite, Day & Night, and Arcoaire furnace brands. All share the same control board and LED flash codes. Also covers Heil, Tempstar, Comfortmaker, Keeprite, Day & Night, Arcoaire.

All ICP Error Codes

2 flashes
Pressure Switch Did Not Open
Pressure switch did not open between cycles.
3 flashes
Pressure Switch Did Not Close
Pressure switch did not close when inducer started.
4 flashes
Limit Circuit Open
Limit circuit open - overheating. Usually restricted airflow.
5 flashes
Flame Sensed With Gas Valve Off
Flame detected when gas valve should be off - leaky valve.
6 flashes
Weak Flame Signal
Weak or non-existent flame sensor signal.
7 flashes
Limit Circuit Lockout
Limit circuit locked out after repeated trips.
8 flashes
Gas Heating Lockout
Gas heating lockout - will not auto-reset.
10 flashes
Line Voltage Polarity Incorrect
Line voltage polarity incorrect - wiring or transformer fault.

Need Help With Something Else?

If you don't see your code here, try our master error code lookup covering all major brands, or our symptom-based diagnostic tool.

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