Error code reference

Lennox Air Conditioner Error Code E425

Outdoor control has increased minimum compressor speed to allow for proper oil return due to low ambient…

Outdoor control has increased minimum compressor speed to allow for proper oil return due to low ambient temperature.

First step from the service manual

No action required; automatically clears when outdoor ambient temperature rises above limit for more than 5 minutes.

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

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E425 on my Lennox Air Conditioner

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Outdoor control has increased minimum

From Service Manual 873194, p.46:

1.No action required; automatically clears when outdoor ambient temperature rises above limit for more than 5 minutes.

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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