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Heil Furnace Error Codes - Complete Guide

Heil and its sister brands (Tempstar, Comfortmaker, Keeprite, ICP, Day & Night, Arcoaire) all use the same control board and share identical LED flash codes. Count the flashes between pauses to identify the fault. Also covers Tempstar, Comfortmaker, Keeprite, ICP, Day & Night, Arcoaire.

All Heil 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.

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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