Error code reference

Lennox Heat Pump Error Code DS2:OFF / DS1:OFF

No power (24V) to board terminals R & C or board failure.

SourceLennox XP16 Series Heat Pump - Service Manualp. 10

Diagnostic procedure

The full DS2:OFF / DS1:OFF 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

Check control transformer power (24V). If power is available to board and LEDs do not light, replace board.

SourceLennox XP16 Series Heat Pump - Service Manualp. 10

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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 heat pump.

Models covered by the manuals that document this code

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The full DS2:OFF / DS1:OFF procedure

Where this code is documented

Models covered by the manuals that document this code

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