Error code reference

Lennox Furnace Error Code E 206

Gas valve second-stage relay failure.

Lennox codes Lennox furnace codes

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Diagnostic procedure

The full E 206 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.

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First diagnostic step

Furnace will operate on 1st stage for remainder of the heating demand. Will clear after fault recovered. If unable to operate 2nd stage, replace control.

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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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The full E 206 procedure

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