GE Refrigerator Error Code F510

The F510 error code on a GE refrigerator indicates that the door board has detected an invalid mold temperature reading from the icemaker. The icemaker mold thermistor is a temperature-sensing component mounted directly on or near the ice mold that monitors the mold's temperature throughout the freeze and harvest cycle. The door control board uses this temperature data to determine when the ice is frozen solid enough to initiate the harvest sequence. When the board receives a signal that falls outside the expected operating range, either too high, too low, or no signal at all, it flags the reading as invalid and generates the F510 code.

The most likely causes involve the thermistor itself or the wiring connecting it to the door board. A failed thermistor can present as an open circuit, a short circuit, or as a resistance value that drifts out of the acceptable range for the given temperature. Wiring issues are also common, including corroded connector pins, broken wires from repeated door opening and closing, or loose connections at the thermistor or board connector. In some cases, the door control board itself may be misreading a valid signal due to an internal fault, though this is less common than thermistor or wiring failures.

Diagnosis should begin with a visual inspection of the thermistor and its wiring harness, checking for obvious damage, corrosion, or disconnected connectors. If wiring appears intact, the thermistor resistance should be measured with a multimeter at a known temperature and compared against the expected resistance curve for the component. A thermistor reading an open circuit or a very low resistance value near zero confirms a failed sensor requiring replacement.