Error code reference

Lennox Air Conditioner Error Code 2

Input indication

Lennox codes Lennox air conditioner codes

Input indication - acknowledges a change such as jumper setting changes, delay overrides, or addition of optional safety device. Does not indicate a problem.

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Step-by-step tests with expected resistance, voltage, and continuity values
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M+ Max·Lennox Air Conditioner

2 on my Lennox Air Conditioner

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Input indication - acknowledges a change such

From Service Manual 769838, p.50:

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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