Coleman Furnace Error Codes

7 error codes for Coleman furnace models. Each links to the full diagnostic procedure from the service manual.

CodeDescription

1 FLASHIgnition failure.2 FLASHCombustion air pressure switch closed; the normally open pressure switch…3 FLASHCombustion air pressure switch failed to close; the normally open pressure…4 FLASHLimit switch open; a primary or auxiliary limit switch has opened its normally…5 FLASHGas flow detected with no call for heat.RAPID FLASHESReverse line voltage polarity detected; both heating and cooling will be…STEADY ONNormal operation; if the LED stays on continuously during a fault condition, it…

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Step-by-step tests with expected resistance, voltage, and continuity values
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1 FLASH on my Coleman Furnace

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Ignition failure

From Service Manual 511126, p.18:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.

3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.

Part WPW10804018

Electronic control board

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