GE Cooktop Error Code FA9

The FA9 error code on a GE induction cooktop indicates that the control board has detected a bad or out-of-range reading from the coil thermistor. The coil thermistor is a temperature-sensing component integrated into or positioned near the induction coil assembly. Its job is to monitor the thermal state of the induction coil in real time, providing feedback to the control board to prevent overheating and ensure safe operation. When the thermistor signal falls outside the expected parameters, such as an open circuit, a short, or an implausible resistance value, the board flags the FA9 fault and typically shuts down that cooking zone.

The induction tray, which houses the coil and thermistor assembly, is closely tied to this fault. Physical damage to the tray, displacement of the thermistor from its mounting position, or heat-related degradation of the thermistor itself can all produce erroneous readings. Wiring between the thermistor and the control board is another point of failure to inspect, as a loose connector or damaged lead wire will cause the same bad-reading symptom as a failed thermistor.

The recommended first diagnostic step is to inspect the coil thermistor and the induction tray for visible damage, secure connections, and proper thermistor seating. If the thermistor or its wiring checks out, the fault typically points to the coil assembly itself, and replacement of the coil is the indicated repair. Because the thermistor and coil are often integrated into a single replaceable unit, a coil replacement resolves both a failed thermistor and any associated tray or coil damage in one step.