Ariston FDU

Ariston error code FDU indicates: Ariston Hotpoint-Ariston Aqualtis & Natis Washing Machine: Door unlock release failure FDU; lock mechanism fails to release door latch at cycle end despite unlock pulse..

The primary root cause for Ariston code FDU is: On Ariston washing appliances: Residual water detected in drum by pressure sensor, mechanical lock slider jammed, or burnt unlock solenoid coil..

To resolve error code FDU: Verify drum is fully drained (run drain program if water remains). Use emergency door release pull-tab behind kickplate filter flap. Replace door interlock. Turn selector to Off, press and hold Start/Cancel button until display resets and door unlock pulse clicks.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Ariston code FDU persists, the physical component causing On Ariston washing appliances: Residual water detected in drum by pressure sensor, mechanical lock slider jammed, or burnt unlock solenoid coil. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test Mechanical Pressure Switch Contacts / Inductive Frequency Sensor across Across switch spade contacts with harness unplugged; electronic output: 40Hz–50Hz frequency signal. Expected nominal reading is Mechanical: Continuity 0.0Ω–0.2Ω (Empty: 11-12, Full: 11-14). Electronic: 20Ω–45Ω coil resistance.. Tolerance: Mechanical switch contacts must transition cleanly on gentle breath pressure. Coil ~22Ω ±5%..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.