Error code reference

Lennox Air Conditioner Error Code E416

The outdoor coil sensor has malfunctioned (open, shorted, or out of range); outdoor unit control will not…

The outdoor coil sensor has malfunctioned (open, shorted, or out of range); outdoor unit control will not perform defrost.

First step from the service manual

Check the resistance of the coil sensor and compare to temperature resistance chart. Replace coil sensor if needed.

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

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E416 on my Lennox Air Conditioner

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The outdoor coil sensor has malfunctioned

From Service Manual 873224, p.36:

1.Check the resistance of the coil sensor and compare to temperature resistance chart. Replace coil sensor if needed.

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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