Display shows F8; refrigerator may not enter or exit defrost correctly, causing temperature swings.

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

Failed main control board, Corrupted defrost timing logic, Shorted defrost circuit

Safety first: Unplug the refrigerator before accessing the main control board.

Verify defrost components: Before condemning the board, test the defrost heater and thermostat for continuity.
Inspect board: Remove the control cover and look for burnt components or damaged traces.
Replace control board: Disconnect all harnesses (label if needed), remove mounting screws, and install the new board. Reconnect harnesses firmly.
Monitor operation: After replacement, allow 24 hours for temperatures to stabilize and confirm F8 does not return.

Hard 4/5

Main Control Board

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