F8
Daewoo
Low Voltage / Power Supply Error
Microwave displays F8 and will not start, often after a power outage
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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
Defective internal low-voltage power supply on control PCB, Power surge damage, Loose AC input connections, Faulty line filter board
How to Fix / Troubleshooting
Safety first: Unplug the microwave before inspection.
Step-by-step:
- 1. Check outlet: Verify the wall outlet voltage with a multimeter if possible. Ensure it matches the microwave's rated voltage and is not sagging under load.
- 2. Avoid extension cords: Plug the microwave directly into the wall outlet.
- 3. Inspect power cord: Check for cuts, burns, or kinks. Replace if damaged.
- 4. Internal inspection (for experienced users): Remove the cabinet and inspect the line filter board and control PCB for burnt components or loose connectors. Tighten any loose AC input terminals.
- 5. Replace control PCB or line filter: If visible damage is present or F8 persists, the affected board may need replacement.
Recommendation: If you suspect surge damage, consider using a surge protector in the future (if allowed by Daewoo guidelines).
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Repair Difficulty
Hard
4/5
Required Part
Line Filter / Power Supply Board
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