Whirlpool Cooktop Error Code F-42

F-42 indicates that the cooktop has detected an incorrect or missing voltage at the power control board or EMI filter board. The cooktop requires a proper 240-volt AC supply, and if either supply leg is absent or out of range, this code will appear. The fault can originate in the home's electrical supply or within the cooktop's internal power distribution components.

No, you should not attempt to use the cooktop while F-42 is active. The code indicates a fundamental power supply problem that prevents the cooktop from operating correctly. Continuing to use the appliance under these conditions risks further damage to the control boards or a potential electrical hazard.

Repair costs vary depending on the cause. If only a circuit breaker reset or wiring tightening is needed, costs can be minimal. Replacing an EMI filter board or a power control board typically involves parts costs ranging from roughly $80 to $250 or more per board, plus labor if a technician is needed. Diagnosing the exact failed component first will help avoid unnecessary parts replacement.

Some steps, such as resetting a tripped circuit breaker, are safe for a homeowner to attempt. However, verifying 240-volt AC at specific board connectors inside the cooktop requires a multimeter, electrical knowledge, and safe working practices around live circuits. Internal board replacement should be handled by a qualified technician if you are not experienced with appliance electrical repair.

A reset by cycling the circuit breaker off and back on may clear the code temporarily if the cause was a transient power disturbance or a tripped breaker. However, if the underlying cause is a failed board, damaged wiring, or a persistent supply voltage problem, the code will return as soon as the cooktop attempts to power on again.