Comfortmaker Furnace Error Codes - Complete Guide

Comfortmaker furnaces are part of the ICP family along with Heil, Tempstar, Keeprite, Day & Night, and Arcoaire. All share the same control board and identical LED flash codes. Also covers Heil, Tempstar, Keeprite, ICP, Day & Night, Arcoaire.

All Comfortmaker 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.

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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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Comfortmaker Furnace Error Codes - Complete Guide

All Comfortmaker Error Codes

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