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Intertherm Furnace Error Codes - Complete Guide

Intertherm furnaces are made by Nordyne for mobile home and manufactured home applications. They share their control board and codes with Frigidaire, Maytag, Tappan, Gibson, Miller, and other Nordyne brands. Also covers Nordyne, Frigidaire, Maytag, Tappan, Gibson, Miller.

All Intertherm Error Codes

1 flash
Ignition Lockout
Locked out after multiple failed ignition attempts.
2 flashes
Pressure Switch Stuck Open
Pressure switch open during inducer operation.
3 flashes
Limit Switch Open
High limit switch open - overheating. Usually restricted airflow.
4 flashes
Pressure Switch Stuck Closed
Pressure switch stuck closed when inducer is off.
5 flashes
Flame Sensed With No Heat Call
Flame detected when there should be no heat call - leaky valve.
6 flashes
Reversed Polarity
Line voltage polarity reversed or grounding fault.
7 flashes
Gas Valve Circuit Problem
Gas valve circuit problem - wiring, coil, or board fault.
8 flashes
Igniter Open Circuit
Igniter open circuit - failed hot surface igniter.

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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