Fisher & Paykel Dishwasher Error Code F21

F21 on a Fisher & Paykel dishwasher indicates a motor bridge over temperature fault. The motor controller has detected that its internal bridge circuit, which drives the wash motor, has exceeded a safe temperature limit and shut down to prevent damage. This is a protective fault code, not a routine operational error. It requires inspection of the motor wiring, connectors, and potentially the motor or controller itself.

A reset may temporarily clear the F21 code, but if the underlying cause is not addressed, the fault will return once the motor bridge overheats again during operation. Resetting is useful to confirm whether the fault is intermittent or persistent, but it should not substitute for a proper inspection of the motor harness, connectors, and related components.

Repair costs vary depending on the root cause. If the fix is limited to cleaning corroded connectors or reseating a harness, costs may be minimal beyond a service call fee, typically in the range of $75 to $150. If the motor or motor controller requires replacement, parts and labor combined can range from $200 to $500 or more, depending on parts availability and local labor rates.

Some causes of F21 are DIY-accessible, particularly inspecting and reseating harness connectors or cleaning corroded terminals at the motor connections. However, if you find arcing damage, water intrusion into the controller, or suspect a failing motor, those repairs typically require component replacement and a higher level of comfort working with appliance electronics. If you are unsure about safely accessing the motor and controller, a qualified appliance technician is recommended.

It is not advisable to continue running the dishwasher while the F21 fault is active. The code indicates that the motor controller circuit has overheated, and continued operation without resolving the cause could lead to further damage to the motor controller or create an electrical hazard, particularly if water intrusion or arcing is involved. Stop use until the fault is diagnosed and corrected.