Fisher & Paykel Cooktop Error Code F5

The F5 error code on a Fisher & Paykel cooktop indicates a gas calibration fault. This occurs during the burner's gas calibration sequence, a process where the cooktop's control system attempts to confirm that the burner is igniting properly and that the gas valve is functioning as expected. If the calibration sequence cannot be completed successfully, the F5 code is triggered and the affected burner is disabled as a safety measure.

There are three distinct failure points that can produce this fault. First, the flame sense circuit may not be detecting a flame even when one is present, which typically points to a contaminated or failed flame sensor, a broken sense wire, or a poor connection at the control board. Second, the burner may simply not be igniting at all, which can be caused by a faulty igniter, a blocked igniter port, or a lack of spark from the ignition module. Third, the gas valve itself may be jammed and failing to rotate to the open position, preventing gas flow regardless of whether the igniter is functioning.

Diagnosing F5 requires checking each of these subsystems in sequence. Start with the flame sense circuit by inspecting the sensor electrode and its wiring for damage, corrosion, or disconnection. Then test the igniter for spark output and confirm the igniter ports are clear of debris. Finally, check the gas valve for smooth rotation and confirm it is receiving the correct control signal. A valve that is mechanically seized or electronically stuck will block gas flow and prevent the calibration sequence from completing.