Carrier Compressor Start Circuit Failure

Dehumidifier powers on but compressor never starts; only fan runs continuously.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed compressor start relay or PTC, Open compressor overload protector, Faulty main control board compressor relay, Open compressor winding

How to Fix / Troubleshooting

Safety first: Unplug the unit. Compressor terminals carry high voltage; testing should be done by qualified personnel.

Homeowner checks:

  • 1. Verify settings: Ensure the humidity setpoint is below the room humidity and that the unit is not in fan-only or defrost mode.
  • 2. Listen for compressor: When the unit calls for dehumidification, listen for a click and a low hum. If you never hear the compressor attempt to start, the start circuit or control board may be at fault.

Technician steps: Testing the start relay/PTC, overload, and compressor windings requires a multimeter and experience. A Carrier technician can replace the start device or compressor as needed.

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Repair Difficulty

Professional Required 5/5

Required Part

Compressor Start Relay/PTC
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