Friedrich
Compressor Start Failure
Unit powers on but compressor never starts; only fan runs
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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, open overload protector, defective run capacitor (if used), faulty control relay on PCB, low ambient lockout
How to Fix / Troubleshooting
Safety: Turn OFF power at the breaker. Compressor circuits carry high voltage and current.
Steps:
- Confirm demand: Ensure the unit is in COOL mode with a low setpoint so that the compressor should be running.
- Listen for sounds: A brief hum followed by a click may indicate a locked compressor or bad capacitor. Silence may indicate no power to the compressor.
- Check outdoor fan: If the fan runs but the compressor does not, a technician should test the capacitor, overload, and compressor windings.
- Board/relay: If the compressor is good but not receiving power, the control board or relay may be faulty and require replacement.
Note: Compressor and capacitor testing should be done by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Compressor Run Capacitor
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