Thermador
Frost Build-Up – Defrost System Failure
Excessive frost or ice buildup on the evaporator and the rear interior wall.
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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 defrost heater, Defective defrost sensor/thermostat, Faulty main control defrost circuit, Door gasket leak allowing moist air in
How to Fix / Troubleshooting
Safety: Unplug the unit before defrosting or accessing the evaporator. Do not use sharp tools to remove ice.
Steps:
- Manual defrost: Remove all bottles, unplug the unit, and allow the ice to melt with towels in place. This may take several hours.
- Inspect gasket: Check the door gasket for tears or gaps. Replace it if it is damaged.
- Test defrost heater: After the ice is removed, access the evaporator and test the heater resistance. Replace it if it is open.
- Check defrost sensor: Test the defrost sensor/thermostat for proper resistance or continuity at the appropriate temperature. Replace it if it is faulty.
- Control board: If the heater and sensor are good, the main control board may not be initiating defrost and should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater
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