Fisher & Paykel Cooktop Error Code F12.4

F12.4 indicates that the thermistor on the master PCB has reported a temperature outside the acceptable range for at least 5 seconds. The acceptable range is between -22°F (-30°C) and 185°F (85°C). This fault can be caused by a failed thermistor, a wiring or connector issue, or an actual overheating condition on the control board.

You should not attempt to continue using the cooktop while this fault is active. The F12.4 code indicates the control board's thermal monitoring has detected a problem, and if the board is genuinely overheating, continued operation could cause further damage to the electronics. Disconnect power and investigate the cause before resuming use.

Repair costs depend on the root cause. If the fix involves only reseating a connector or clearing a ventilation blockage, costs may be limited to a service call fee, typically in the range of $75 to $150. If the thermistor or master PCB needs replacement, parts and labor combined can range from $150 to $400 or more depending on part availability and local labor rates.

Some causes of F12.4 are DIY-accessible, such as checking and reseating the thermistor connector or clearing blocked ventilation around the cooktop. However, replacing the thermistor or the master PCB requires comfort working with appliance electronics and the ability to safely disconnect power before beginning any inspection. If you are unsure, a qualified appliance technician should perform the diagnosis.

Cycling power to the cooktop may temporarily clear the fault display, but if the underlying cause is a failed thermistor, damaged wiring, or a ventilation problem, the F12.4 code will return once the cooktop is back in operation. A reset alone is not a fix and should only be used as part of the diagnostic process after addressing the root cause.