Friedrich
Electrical Relay or Contactor Noise / Hard Starting Compressor
Clicking or buzzing noise from outdoor section, especially at startup
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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
Failing compressor, weak run capacitor (if used), pitted relay contacts on PCB, low supply voltage
How to Fix / Troubleshooting
Safety: Turn OFF power at the breaker before opening the outdoor compartment.
Steps:
- Listen carefully: Determine if the noise is from the compressor or from a relay on the control board.
- Check voltage: Have a technician verify that supply voltage is within spec.
- Capacitor test: On models with a separate capacitor, a technician can test and replace it if weak.
- Relay/board replacement: If the relay is chattering or buzzing due to worn contacts, the control board may need replacement.
- Compressor diagnosis: Repeated buzzing with no start may indicate a locked compressor, requiring professional evaluation.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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