Washer-dryer overfills or shows E04; water may be visible in the door seal area or leaking from the front

Safety first: Unplug the appliance and close the water tap immediately. If water is leaking, mop up and avoid contact with electrical parts.

Step-by-step checks:

• 1. Check for water in the base tray:
  • Carefully tilt the machine slightly forward (with help) and see if water runs out from the base.
  • If the base tray is full, the anti-flood float switch may have triggered.
  • Remove the rear or side panel (if accessible) and dry the base tray thoroughly with towels.
  • Identify and correct the source of the leak (hose clamp, tub seal, pump, or valve).
• 2. Inspect the pressure sensor hose:
  • Locate the thin hose from the tub to the pressure sensor.
  • Check for blockages (soap residue, lint) by disconnecting and blowing through it.
  • Ensure it is not kinked or split; replace if damaged.
• 3. Test the pressure sensor:
  • Check the electrical connector for corrosion or loose pins.
  • With a multimeter, verify output changes when gently blowing into the sensor (refer to Siemens service data if available).
  • If readings are erratic or absent, replace the pressure sensor.
• 4. Check inlet valve operation:
  • With the machine unplugged, inspect the AquaStop or inlet valve for signs of sticking or internal damage.
  • If the valve continues to pass water when de-energized (tap open, machine unplugged), replace the valve assembly.

When to call a technician: If you cannot locate the leak source or if the control module appears to misread water levels, professional diagnosis is recommended.