F20
Liebherr
Power Supply / Internal Fuse Fault
Dryer displays F20; unit may not start and may show signs of power issues.
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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
Blown internal line fuse on control board, Shorted component on PCB, Incorrect mains connection, Surge damage
How to Fix / Troubleshooting
Safety first: Unplug the dryer. Internal fuses and live parts can be hazardous; if unsure, contact a professional.
- Check external supply: Verify that the wall outlet and circuit breaker are functioning and correctly rated for the dryer.
- Inspect power cord: Look for cuts, burns, or kinks in the mains cable. Replace if damaged.
- Access control board: Remove the top cover and locate the main control PCB. Some boards have a replaceable fuse; inspect it visually and test with a multimeter.
- Investigate cause: If the fuse is blown, there may be an underlying short. Inspect for burnt components or wiring before simply replacing the fuse.
- Professional repair: Due to the risk of repeated failure or fire, internal power faults should be handled by an authorized Liebherr technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Internal Line Fuse / Main Control PCB
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