Panasonic Defrost System Failure

Ice buildup on evaporator coil causing poor cooling and fan noise

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.

Possible Causes

Open defrost heater, failed defrost thermostat/thermal fuse, faulty defrost timer function in main PCB, sensor misreading evaporator temperature

Safety: Unplug the freezer. Heater wiring is live during operation.

Steps:

1. Manual defrost: Allow all ice to melt completely. Do not use sharp tools.
2. Test heater and fuse: As described in H23, check continuity of the defrost heater and thermal fuse and replace if open.
3. Check defrost sensor: Verify the evaporator thermistor is correctly positioned and within resistance specifications.
4. Control function: If all components test good, the main PCB may not be initiating defrost; replacement is required.

Hard 4/5

Defrost Heater

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