GE Refrigerator Error Code F81

The F81 error code on a GE refrigerator indicates that the icemaker mold temperature sensor, located on the door board, is reporting an invalid reading. The door board is the control board mounted within or behind the freezer door, and it directly manages icemaker functions including monitoring the temperature of the ice mold during the freeze and harvest cycles. An "invalid" temperature reading means the control system is receiving a signal that falls outside the expected operating range, either because the sensor has failed, the wiring is compromised, or the door board itself is not processing the signal correctly.

The mold temperature sensor is a thermistor, a resistive temperature device whose resistance changes predictably with temperature. When the door board reads a resistance value that does not correspond to any valid temperature within the icemaker's operating parameters, it triggers the F81 fault to protect the icemaker from operating under unknown thermal conditions. This can result in the icemaker stopping ice production entirely until the fault is resolved.

Common causes include a failed thermistor in the ice mold, a damaged wiring harness running through the door, a poor or corroded connector between the sensor and the door board, or a faulty door board that can no longer accurately interpret sensor signals. Because the wiring runs through a refrigerator door, repeated opening and closing can stress connections and break individual wire strands over time, making wiring issues a frequent contributor to this fault.