Possible Causes

Failed defrost heater, Defective defrost thermostat, Faulty defrost control on main board, Broken wiring in defrost circuit

How to Fix / Troubleshooting

Safety: Unplug the refrigerator before accessing the evaporator and defrost components.

Steps:

1. Manually defrost: Unplug the unit and leave doors open for 24 hours to melt ice. Do not use sharp tools to chip ice.
2. Access evaporator: Remove freezer drawers and rear panel to expose the evaporator coil and defrost heater.
3. Test heater and thermostat: Use a multimeter to check continuity of the defrost heater and defrost thermostat. Replace any open components.
4. Inspect wiring: Look for broken or burnt wires between the heater, thermostat, and main board.
5. Control board: If components and wiring are good, the main control board may not be initiating defrost and may need replacement.

Note: Persistent frost after component replacement suggests a control or sensor issue; consider professional diagnosis.

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