Fisher & Paykel Dishwasher Error Code U3

U3 means the DishDrawer detected that the tub filled with water in less time than expected, indicating that water was already present in the tub from a previous cycle that did not drain completely. The dishwasher halts operation when this occurs to prevent overflow. Common causes include a blocked drain pump, clogged drain hose, or an incorrect low-pressure setting on a high-pressure water supply.

You should not continue running the dishwasher while U3 is active. The error indicates a drain problem that leaves standing water in the tub, and running cycles with undrained water can lead to overflow, poor wash results, or additional stress on the motor and pump components. Resolve the underlying cause before resuming normal use.

Repair costs vary depending on the cause. Clearing a blocked drain pump or hose yourself involves no parts cost and only your time. If the drain impeller is damaged, replacement parts typically range from $20 to $60. A motor electronics or control board failure is the most expensive scenario, with parts and labor potentially ranging from $150 to $400 or more depending on your location and the technician's rates.

Start by checking whether the tub has drained. If water is still sitting in the tub, inspect the drain pump and impeller for blockages and check the drain hose for kinks or clogs. If the tub is empty, verify that the locknut on the filter plate is locked securely. Also confirm that the machine's pressure setting matches your actual water supply pressure, and check that the spray arm and rotor spin freely.

A reset may temporarily clear the error code, but it will return if the underlying cause is not addressed. Because U3 is triggered by a condition the machine detects during operation, the fault will reappear in the next cycle if the drain system is still blocked or the pressure setting remains incorrect. Fix the root cause first, then reset the machine.