Machine overfills or shows E04; water level too high in drum, sometimes causing leaks from door or drawer.

Safety first: Unplug the appliance and close water taps. If the drum is overfilled, manually bail out water before tipping the machine.

Step-by-step checks:

• Inspect the pressure hose: Remove the top cover. Locate the small rubber hose running from the tub/air chamber to the pressure switch. Check for splits, kinks, or disconnection. Replace if damaged.
• Clear the air chamber: The hose usually connects to a plastic air chamber on the side of the tub. Detach the hose and gently blow through the chamber to clear detergent sludge. If heavily blocked, remove and wash it thoroughly.
• Test the pressure switch: Disconnect the switch. Using a multimeter, check continuity across the switch terminals while gently blowing into the pressure port. You should hear clicks and see changes in continuity. If not, replace the pressure switch.
• Check the inlet valve: Ensure the water inlet valve is not stuck open. With the machine unplugged and taps open, no water should flow into the drum. If water continues to enter, the valve is mechanically stuck and must be replaced.
• Reassemble and test: Refit all hoses and the top cover. Plug in and run a short wash to verify correct fill level.

When to call a technician: Persistent E04 after these checks may indicate a faulty main control board or wiring fault, which should be diagnosed by a professional.