F4
Midea
Compressor Relay / Output Fault
Freezer shows F4; compressor may not run even though display appears normal
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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 relay on main PCB, Burnt PCB trace to compressor output, Loose compressor wiring connector, Internal short on board
How to Fix / Troubleshooting
Safety first: Unplug the freezer. Work carefully around mains-voltage components.
Steps:
- Confirm compressor not running: Listen and feel the compressor when the unit should be cooling. If silent and cool to the touch, it is likely not receiving power.
- Check wiring: Inspect the harness from the main board to the compressor start device for loose or burnt connectors.
- Access main board: Remove the rear control cover to expose the main PCB. Look for burnt spots, cracked solder joints, or a melted relay.
- Test output (advanced): A qualified person can test for voltage at the compressor output terminals when the unit calls for cooling. If no voltage is present and the board is powered, the relay is likely bad.
- Replace main board: Install a new Midea main control board if the compressor relay circuit has failed.
Warning: Live voltage testing should only be done by trained individuals with proper equipment.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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