Washer-dryer will not drain; water remains in drum and F05 is displayed.

Safety: Unplug the machine. Prepare towels and a shallow tray to catch water.

Clear blockages:

• Clean pump filter: Open the lower front access flap. Slowly unscrew the pump filter cap and allow water to drain into a tray. Remove debris (coins, lint, buttons) from the filter and pump impeller area. Ensure the impeller spins freely.
• Check drain hose: Inspect the external drain hose for kinks or clogs. Detach from the standpipe or sink trap and flush with water.
• Inspect pump wiring: With the lower panel removed, check the pump electrical connector for corrosion or loose fit. Reseat it.
• Test pump: With the machine unplugged, measure pump coil resistance (typically 150–300 Ω; check Ariston specs). If open or shorted, replace the pump.
• Pressure system: If the pump runs but F05 persists, clean the pressure hose and chamber as described for F04 to ensure the control board correctly detects an empty tub.

Note: After cleaning, run a rinse and spin to confirm proper draining.