Error code reference

Lennox Hvac Error Code 208

The indoor and outdoor unit capacities do not match.

First step from the service manual

Check for proper configuring in installation instructions. Alarm is just a warning; the system will operate but might not meet efficiency and capacity parameters.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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Get the full diagnostic procedure for 208.

Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
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208 on my Lennox HVAC

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The indoor and outdoor unit capacities do not

From Service Manual 831384, p.36:

1.Check for proper configuring in installation instructions. Alarm is just a warning; the system will operate but might not meet efficiency and capacity parameters.

2.Measure door lock assembly resistance across the PTC terminals. Expected: ~200 ohms cold, rising sharply once energized.

3.Inspect strike and latch alignment. A warped door or misaligned strike prevents the switch stack from closing in the correct sequence.

Part W10810403

Door lock assembly

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First step from the service manual

Get the full diagnostic procedure for 208.

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