Error code reference

Lennox Hvac Error Code 131

The air-handler control parameters are corrupted.

First step from the service manual

Reconfigure the system. Replace the control if heating or cooling is not available.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
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131 on my Lennox HVAC

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The air-handler control parameters are corrupted

From Service Manual 832259, p.31:

1.Reconfigure the system. Replace the control if heating or cooling is not available.

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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First step from the service manual

Get the full diagnostic procedure for 131.

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