Sharp
Defrost System Failure
Freezer has heavy frost or ice buildup on the back wall or around the evaporator cover.
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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, Open defrost thermostat or thermal fuse, Faulty defrost sensor (evaporator thermistor), Main control PCB not initiating defrost
How to Fix / Troubleshooting
Safety: Unplug the freezer before removing the evaporator cover or testing components.
Steps:
- Manual defrost: Remove food, unplug the unit, and allow all ice to melt. Use towels to catch water. Do not use sharp tools to chip ice.
- Access components: Remove the rear interior panel to expose the evaporator, defrost heater, thermostat, and sensor.
- Test heater and thermostat: As described under E5, check resistance of the heater and continuity of the defrost thermostat/thermal fuse. Replace any open components.
- Check defrost sensor: Test the evaporator thermistor for proper resistance change with temperature. Replace if faulty.
- Control board: If all hardware tests good, the main PCB may not be initiating defrost cycles. Replace the board if confirmed.
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Repair Difficulty
Hard
4/5
Required Part
Defrost Heater Assembly
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