Luma
Frost Buildup / Defrost Failure
Excessive frost or ice buildup on the back wall or evaporator; airflow is restricted and cooling performance drops.
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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 defrost heater, Failed defrost sensor, Faulty defrost control on main board, Door gasket leak allowing humid air in
How to Fix / Troubleshooting
Unplug the cooler before defrosting. Do not use sharp tools to remove ice.
- Manual defrost: Open the door and allow the unit to sit unplugged until all ice melts. Use towels to catch water.
- Inspect gasket: Check the Luma door gasket for tears or gaps. Replace if it does not seal evenly all around.
- Check defrost components: Remove the interior rear panel and test the defrost heater and sensor with a multimeter. Replace any open heater or faulty Luma defrost sensor.
- Control board: If heater and sensor are good but frost returns quickly, the defrost control circuit on the main board may be defective and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater or Defrost Sensor
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