Error code reference

Carrier Air Conditioner Error Code 4

Locked Rotor condition detected by CADM.

Locked Rotor condition detected by CADM.

First step from the service manual

Check for low line voltage to compressor, excessive liquid refrigerant in compressor, or seized compressor bearings.

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

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M+ Max·Carrier Air Conditioner

4 on my Carrier Air Conditioner

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Locked Rotor condition detected by CADM

From Service Manual 985638, p.50:

1.Check for low line voltage to compressor, excessive liquid refrigerant in compressor, or seized compressor bearings.

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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