Fisher & Paykel Dishwasher Error Code F9

F9 indicates a Power Supply or Controller Fault. When this code appears, the dishwasher disables its power supply, locks out the controls, and logs the fault internally. The code points to an issue in the power circuit or a connected component such as the dropper resistor or detergent diverter. Diagnosis involves checking harness connections and measuring component resistance values.

No. When F9 is active, the dishwasher has already disabled its power supply and locked out user controls as a protective measure. Attempting to bypass the lockout or continue operation without resolving the fault is not recommended. The dishwasher should remain out of service until the fault is diagnosed and corrected.

Repair cost depends on the root cause. If the fix is a reseated harness connector, out-of-pocket costs may be minimal beyond a service call fee, which typically ranges from around $80 to $150. Replacing a dropper resistor or detergent diverter generally adds $50 to $200 in parts and labor. A controller board replacement represents the higher end of the cost range, often $200 to $500 or more depending on parts availability and local labor rates.

A power cycle is always the recommended first step: unplug the dishwasher from the wall, wait 20 seconds after restoring power, and observe whether F9 returns. If the fault was caused by a temporary power disturbance, the reset may clear it permanently. If F9 reappears within 20 seconds of power-up, the underlying cause is still present and further diagnosis of the harness and components is required.

Start with a power cycle by unplugging the unit at the wall and waiting before reconnecting. If F9 returns promptly, inspect the POWER and DISPENSER harness connectors for damage or poor seating. Use a multimeter to measure the resistance of the dropper resistor and the detergent diverter, comparing readings against specification. If a component is out of range or a connector is damaged, that component or harness section will need to be repaired or replaced.