Carrier Air Conditioner Error Codes

8 error codes for Carrier air conditioner models. Each links to the full diagnostic procedure from the service manual.

CodeDescription

2System Pressure Trip 3Short Cycling 4Locked Rotor condition detected by CADM.5Open Circuit 6Missing Phase 7Reverse Phase 8Welded Contactor 9Low Voltage

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Step-by-step tests with expected resistance, voltage, and continuity values
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M+

M+ Max·Carrier air_conditioner

2 on my Carrier air_conditioner

M+

System Pressure Trip — Discharge pressure out

From Service Manual 836667, p.39:

1.Check for high head pressure, dirty/blocked/damaged condenser coil, condenser fan not running; if low pressure switch is open check for low refrigerant charge, evaporator blower not running, frozen evaporator coil, faulty metering device, dirty condenser coil, or liquid line restriction.

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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