F4
Kenmore
Low Voltage or Power Supply Fault
Display shows F4; unit may not cool and fans may be off; some Kenmore models use F4 for power supply faults.
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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 internal power supply on control board, Loose power connector, Household voltage too low
How to Fix / Troubleshooting
Safety: Unplug the unit before accessing the rear or control board. Use caution when working around mains voltage circuits.
Steps to address F4:
- Verify outlet voltage: Use a multimeter to confirm that the wall outlet provides stable voltage within the range specified on the Kenmore rating label.
- Avoid extension cords: Plug the cooler directly into a properly grounded outlet.
- Inspect power cord and plug: Look for damage, overheating, or loose prongs. Replace the power cord if any defects are found.
- Access main control board: Remove the rear or top cover to expose the PCB. Check the AC input connector for looseness or discoloration.
- Check internal fuses: Some boards have small fuses; test for continuity and replace only with identical ratings if blown.
- Replace control board if needed: If the internal power supply section is visibly damaged or F4 persists, replace the main control board with the correct Kenmore part.
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Repair Difficulty
Hard
4/5
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