LG Defrost System Failure

Ice buildup on back wall of freezer; freezer temperature rises over time and fan becomes noisy.

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, Faulty defrost sensor (thermistor), Main control board not initiating defrost

Safety: Unplug the refrigerator and protect flooring from water.

Manual defrost: Remove freezer contents and rear panel. Use a hair dryer on low and towels to melt ice from the evaporator and fan.
Test components: With the unit still unplugged, test the defrost heater and thermostat for continuity, and check the defrost thermistor resistance.
Replace failed parts: Install new LG-compatible heater, thermostat, or thermistor as needed.
Monitor: After reassembly, monitor for several days to ensure frost does not return.

Hard 4/5

Defrost Heater

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