Ariston F4

Ariston error code F4 indicates: Ariston Hotpoint-Ariston 3D Zone Wash MaxiSpace Dishwasher: Draining timeout failure F4; water level in hydraulic sump fails to drop below empty threshold within 4 minutes..

The primary root cause for Ariston code F4 is: On Ariston dishwashers: Sump microfilter blocked by food soil, kinked drain hose, blocked non-return flap valve, or jammed drain pump impeller..

To resolve error code F4: Remove and wash central fine mesh filters. Check drain impeller under sump cover for glass shards. Measure pump coil resistance (160–185 Ω). Hold Start/Reset key for 5 seconds until cycle cancel chime sounds and drain pump completes sump evacuation.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Ariston code F4 persists, the physical component causing On Ariston dishwashers: Sump microfilter blocked by food soil, kinked drain hose, blocked non-return flap valve, or jammed drain pump impeller. 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.