Error code reference

Lennox Furnace Error Code 5 Flashes

Rollout switch open (control 103085).

SourceLennox ML195UH Series - Service Manual: Gas Furnacep. 10

Diagnostic procedure

The full 5 Flashes 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 for blockage in combustion passages; reset rollout switch after resolving cause.

SourceLennox ML195UH Series - Service Manual: Gas Furnacep. 10

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

4 manuals in the MyPros+ library document this code for Lennox furnace.

Models covered by the manuals that document this code

More models are covered than are listed here.

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The full 5 Flashes procedure

Where this code is documented

Models covered by the manuals that document this code

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