You know your refrigerator control board is bad when you experience multiple electronic symptoms that persist after hard reset and basic checks. Common signs of bad control board include refrigerator not cooling at all or display completely blank even though outlet has power and breaker not tripped, indicating board not sending power to compressor and fans. Second, error codes that return immediately after reset, such as PF for power failure that will not clear, or flashing temperatures that cannot be set, or specific codes like F1E0 for control failure. Third, compressor not starting but you hear clicking from back, board relay may have failed to send power to compressor. Fourth, fans not running like evaporator fan inside freezer or condenser fan behind fridge not spinning even though refrigerator warm. Fifth, ice maker and water dispenser not working due to board not sending power. Sixth, lights not working inside or interior lights flickering. Seventh, burning smell or visible burn marks on board, open back panel near top and inspect main control board for blackened components, melted plastic, or swollen capacitors. To test, unplug refrigerator for 10 minutes to reset, if symptoms persist, test power to board with multimeter, board should have 120 volts input and send power to compressor. Control board replacement costs 150 to 400 dollars including board at 100 to 250 dollars plus labor. Always check cheaper parts like thermostat and defrost timer first, as they mimic board failure.
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