Day & Night Furnace Error Codes - Complete Guide

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

All Day & Night 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.

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Day & Night Furnace Error Codes - Complete Guide

All Day & Night Error Codes

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