Koldfront
Relay Chatter / Start Circuit Problem
Clicking or buzzing noise from the control area when the compressor should start, but compressor does not run.
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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
Weak compressor start relay, low supply voltage, failing main control board relay, seized compressor
How to Fix / Troubleshooting
Safety first: Unplug the unit. High voltage is present on the control board and compressor terminals.
Steps:
- 1. Verify voltage: Have a qualified person check that the outlet voltage matches the unit’s rating and is not sagging under load.
- 2. Inspect control board: Remove the control box cover and listen/feel for relays clicking repeatedly when cooling is commanded.
- 3. Check start relay: Inspect the compressor start relay/PTC for signs of overheating or cracking. Replace if suspect.
- 4. Board replacement: If the relay on the board is chattering and the compressor and start components test good, the main control board may need replacement.
- 5. Technician check: A seized compressor will cause repeated start attempts and relay chatter; a technician must confirm and advise on replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board or Compressor Start Relay
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