Error code reference

Lennox Heat Pump Error Code DS2 ON / DS1 ON

Circuit board failure: internal component failure on defrost control board.

SourceLennox XP14 Series Heat Pump - Full Service Manualp. 9

Diagnostic procedure

The full DS2 ON / DS1 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

Cycle 24 volt power to control. If code does not clear, replace control.

SourceLennox XP14 Series Heat Pump - Full Service Manualp. 9

Unlock with pass

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

2 manuals in the MyPros+ library document this code for Lennox heat pump.

Models covered by the manuals that document this code

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The full DS2 ON / DS1 ON procedure

Where this code is documented

Models covered by the manuals that document this code

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