Error code reference

Lennox Furnace Error Code E349

No 24 Volts between R & O on integrated control with non-communicating outdoor unit (dual fuel module required for heat pump application).

SourceLennox EL296DFV(X) - Service Manual: icomfort-Enabled Gas Furnacep. 14

Lennox codes Lennox furnace codes

Diagnostic procedure

The full E349 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

Configuration link R to O needs to be restored. Replace link or hard-wire.

SourceLennox EL296DFV(X) - Service Manual: icomfort-Enabled Gas Furnacep. 14

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

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

Models covered by the manuals that document this code

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The full E349 procedure

Where this code is documented

Models covered by the manuals that document this code

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