Fisher & Paykel Washer Error Code 11

Error code 11 on a Fisher & Paykel washer indicates that the Motor Controller microprocessor has detected a negative pressure reading while monitoring the water level through the pressure sensor system. The pressure sensor measures water depth by detecting air pressure in a sealed tube connected to the bottom of the wash bowl. When this pressure tube is disconnected and then reconnected while water is still present in the bowl, it creates an abnormal pressure differential that registers as a negative value, which falls outside the expected operating range and triggers the fault.

The pressure sensing system works by trapping a column of air between the water surface and the pressure sensor. Any disruption to this air column, such as water entering the tube itself or an improper reconnection sequence, corrupts the baseline reference the controller uses to calculate water level. A negative reading tells the controller that the sensed pressure is lower than the atmospheric reference point it established, which is physically inconsistent with normal operation.

The most direct resolution involves ensuring the bowl is fully pumped out before servicing the pressure tube, then physically removing the tube from the pressure sensor port, clearing any water that may have entered the tube, and firmly reconnecting it. This restores a dry, unobstructed air column so the sensor can re-establish an accurate atmospheric baseline. If the error persists after completing this procedure, the pressure tube itself may have a blockage, crack, or the pressure sensor may require inspection.