Winterhalter error codes, decoded.

Fill-or-drain timeout on UC undercounter, PT pass-through, and MTR rack conveyor machines — the wash tank did not reach the fill level or did not drain within the controller's window; the most-searched Winterhalter code globally. Inspect inlet solenoid strainer for scale, verify drain hose loop height (60–100 cm typical), and test the drain pump from the service menu manual-drain routine.

Wash-tank temperature fault — either the wash-tank NTC probe is reading out of range (open or shorted) or the tank is not heating up. Ohm the probe at room temperature against the spec curve, clamp-meter the tank heater contactor on a heat call, and check the safety thermostat for a tripped manual reset.

Boiler / final-rinse temperature fault — the booster boiler is not reaching the 85 °C final-rinse setpoint or the boiler probe reads out of range. Check element amp draw (typically 6–18 kW depending on model), verify the descale-due alert has been cleared, and confirm the cold-water supply is at spec.

Boiler heating timeout — boiler did not reach setpoint within the maximum allowed time; commonly a scaled element on hard-water sites. Run the descale routine from the service menu, then re-test. Persistent E3 after descale points to a failed element or contactor.

Wash-tank heating timeout — tank did not reach the 60 °C wash setpoint within the allowed window; mirror diagnostic of E3 applied to the wash-tank heater rather than the boiler. Check element resistance, contactor coil voltage, and safety thermostat.

Detergent dispensing fault — the detergent pump did not deliver the commanded dose, or the suction lance level switch reports empty. Verify the detergent container is full and the lance is fully inserted, prime the pump from the service menu, and inspect the chemical line for air lock or kink.

Rinse-aid dispensing or pressure fault — the rinse-aid pump did not deliver dose, or the final-rinse pressure switch did not see the expected pressure. Check the rinse-aid container, prime the rinse-aid pump, and inspect the rinse arm and nozzles for scale blockage.

Wash pump or drain pump current fault — the pump motor is drawing out of range (jammed impeller, foreign object in pump housing, failed run capacitor, shorted winding). Lock out power, pull the pump access cover, and inspect the impeller before clamp-metering the motor.

Door switch or hood-position fault — the controller did not see the door / hood close fully (UC machines) or did not see the hood lift complete its travel (PT machines). Inspect the door switch / reed sensor, verify the hood spring tension is in spec on PT models, and check the hood-position cam alignment.

Service code — descale-due alert from the hour-counter / cycle-counter logic. Run the descale routine from the Connected Wash service menu using Winterhalter Liquid Descaler; the routine times the soak, drains, and rinses automatically. Routine descaling on a documented schedule prevents most recurrent E2 / E3 / E5 trips on hard-water sites.