F20
Bauknecht
Door/Mullion Heater Circuit Failure
Error indicating door heater or mullion heater fault (on models with anti-condensation heaters)
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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
Open heater element, Broken wire in door harness, Faulty relay on control board, Connector corrosion
How to Fix / Troubleshooting
Safety first: Unplug the refrigerator before working on heater circuits. Heaters operate at mains voltage.
- Check for condensation: Excessive condensation or sweating around the door frame can indicate heater failure.
- Inspect door harness: At the hinge area, look for pinched or broken wires that feed the heater.
- Do not open sealed door: Many door heaters are embedded and not serviceable separately. If the heater is open-circuit, the entire door assembly may need replacement.
- Board-side checks: A technician can test heater resistance and board output. Do not attempt live testing without proper training.
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Repair Difficulty
Professional Required
5/5
Required Part
Door Assembly with Integrated Heater
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