Display shows dF or similar defrost indication for an extended period, freezer warms up more than normal during defrost.

Safety: Unplug the freezer before inspecting internal components. The defrost heater can be very hot immediately after a cycle.

• Power reset: Disconnect power for 15 minutes to exit any software-stuck defrost cycle. Reconnect and observe if normal cooling resumes.
• Check evaporator temperature: After several hours of operation, the evaporator should be cold and lightly frosted, not warm. If it remains warm, the heater may be stuck on.
• Inspect defrost relay on PCB: Access the main PCB and look for a stuck or burnt defrost relay/triac. Signs of overheating indicate a fault.
• Test defrost sensor: Verify that the defrost sensor/thermostat opens when warm, allowing the PCB to end the defrost cycle.
• Replace faulty parts: If the relay is welded closed or the sensor is not switching correctly, replace the main control board and/or defrost sensor/thermostat as appropriate.

Warning: Operating with a stuck-on defrost heater can overheat and damage the cabinet. If you suspect this condition, leave the freezer unplugged until repaired.