Error code reference

Lennox HVAC Error Code AM30 LED Continuous On

AM30 blower/pump control board error: timed-on delay jumper setting cannot be read (defaulting to 15 seconds), or simultaneous heating and cooling demand, or board failure.

SourceLennox CompleteHeat HM30/AM30 - Service Manualp. 40

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Diagnostic procedure

The full AM30 LED Continuous On procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Remove jumper and reposition on pins corresponding with desired timed-on period; check wiring at thermostat and AM30 board connections; if still failing replace AM30 control board.

SourceLennox CompleteHeat HM30/AM30 - Service Manualp. 40

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

1 manual in the MyPros+ library documents this code for Lennox hvac.

Models covered by the manuals that document this code

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The full AM30 LED Continuous On procedure

Where this code is documented

Models covered by the manuals that document this code

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