KitchenAid Washer Error Code F21

F21 indicates a pressure switch failure on a KitchenAid washer. The control board did not detect water entering the tub, or the pressure switch did not trip after the flow sensor registered 10.5 gallons of water intake. The washer stops the cycle until the issue is resolved. The fault points to the pressure switch, its connected hose, the inlet valve, or the wiring in that circuit.

No, you should not continue running the washer while F21 is active. The error means the machine cannot confirm proper water levels, which could result in the washer running dry or not completing cycles correctly. Continued use without resolving the fault risks further damage to the motor or other components. Disconnect power and diagnose the issue before resuming use.

Unplugging the washer and restoring power may temporarily clear the F21 code, but the error will return if the underlying issue is not fixed. A reset does not repair a faulty pressure switch, blocked hose, or failing inlet valve. Clearing the code without addressing the root cause means the washer will likely fault again during the next fill cycle. A proper repair is needed for the code to stay clear.

Some causes of F21 are DIY-friendly, such as inspecting and clearing a kinked pressure hose or tightening loose wiring connections. Always unplug the washer before performing any inspection or repair. Replacing the pressure switch or inlet valve requires basic mechanical skills and is manageable for experienced DIYers. If the control board is the root cause, professional repair is typically recommended.

Repair costs depend on the root cause. Replacing a pressure switch typically ranges from $30 to $80 for the part, plus labor if a technician is hired. An inlet valve replacement generally runs $40 to $100 for parts. Control board replacement is the most expensive scenario and can range from $150 to $350 or more for parts alone. A professional service call adds labor costs on top of any parts.