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Compressor is running continuously. Freezer temp indicator says "80" but temp is -17 or colder. Refrigerator compartment is colder than setpoint - probably due to colder freezer. Action so far: cleaned very dirty coils Tested freezer thermistor both separately and in circuit - ohms appropriate for temperature Replaced freezer thermistor (had part) - no effect Replaced main board (only one board on this unit) - freezer and refrigerator compartments came into temperature and compressor cycled normally. 3 days later problem returned. Compressor now runs continuously once again and freezer temp display is 80. Site did see a power glitch - short, long, long - before the problem first occurred. After I replaced the main board we saw one very short power glitch. This is nothing new at our site as we often seek power variation at around 8am each morning. Fridge is 7 years old. Could something in the power circuit have failed? I didn't check the capacitor and haven't revisited the sensors or new main board output. Any thoughts appreciated.