Zenith Dishwasher Error Code F10

The F10 error code on a Zenith dishwasher indicates that the turbidity sensor is reporting an abnormally high reading, with a possible open circuit condition on the sensor itself. The turbidity sensor is responsible for measuring the cloudiness or particle load of the wash water, allowing the dishwasher's control board to determine how dirty the water is and adjust cycle length and intensity accordingly. When the sensor reports a reading outside of its expected range, the control interprets this as either extremely dirty water or a fault in the sensor circuit.

An open circuit on the turbidity sensor typically points to a broken or disconnected wiring harness, a failed sensor element, or corroded connector pins between the sensor and the main control board. In some cases, heavy limescale or food debris buildup directly on the sensor lens can interfere with its optical or electrical readings, producing a falsely elevated output. The sensor is usually located on the sump assembly at the base of the dishwasher tub.

Diagnosing F10 involves inspecting the sensor and its wiring harness for visible damage, corrosion, or disconnection. The sensor's electrical continuity should be checked to confirm whether a true open circuit exists. If wiring and connections are intact, the sensor itself is likely faulty and will need replacement. In cases where buildup is the cause, cleaning the sensor lens and surrounding sump area may restore normal operation without requiring a parts replacement.