Because you can hear water rushing into the sink and can see the pump impeller spinning, the pump motor itself is getting power and working. However, the machine is failing to clear that final 2% of water quickly enough to satisfy the timer. [
1,
2,
3]
On a Miele of this vintage, this exact symptom is typically caused by one of three issues.
1. A Blocked Pump Breather/Vent Pipe
This is the most common culprit for a Miele that pumps out the bulk of the water but struggles at the very end. [
1,
2]
- The Component: There is a small, narrow rubber breather/vent tube that runs from a small hole inside the right side of the pump filter housing up to the detergent drawer or anti-siphon valve. [1]
- The Issue: Over 14 years, this small pipe frequently gets gummed up with old detergent sludge, fabric softener, or lint. If air cannot vent through this tube, an airlock/vacuum forms in the pump housing. The pump loses its prime, cavitation occurs, and it stalls out on the last bit of water. [1, 2]
- The Fix: Unplug the machine. Look inside the pump housing on the right side for a small hole. Use a flexible pipe cleaner, zip tie, or wire to gently clear it out. [1, 2]
2. A Gummed-Up Pressure Chamber
Miele machines do not look at the pump to see if water is gone; they rely on air pressure. []
- The Component: A large black rubber sump hose sits under the drum, which contains a plastic bottle-shaped component called the pressure chamber. A thin plastic cap tube runs from this chamber up to the electronic pressure switch at the top of the machine. [1]
- The Issue: When water drains, the pressure inside this chamber should drop to zero. If the pressure chamber is filled with thick, gelatinous sludge or limescale, it traps residual air pressure or fails to drop quickly enough. The machine "thinks" there is still water inside even if it is completely empty. [, 2]
- The Fix: Run a service wash with a Miele IntenseClean agent or a specialized washing machine descaler on the hottest cycle (95°C) to dissolve internal sludge. If that fails, the front panel must be opened to manually clean the plastic pressure bottle. [1, 2, 3]
3. A Worn Pump Impeller (Slipping Under Load)
Even though you can see the impeller spinning with the cover off, it might be failing under a structural load. [
1,
2]
- The Component: Miele utilizes magnetic synchronous pumps. []
- The Issue: As these pumps age, water can breach the internal seals, degrading the internal magnetic rotor. When running dry or in shallow water with the cover removed, the impeller spins freely. However, when submerged under a full column of water, the impeller slips on its spindle or loses torque, slowing down drastically and failing to clear the final puddle in time. [1, 3, 4]
- The Fix: With the machine off, try wiggling the plastic impeller blade. If it feels excessively loose, rocks back and forth on its shaft, or pulls forward, the pump motor assembly is worn out and needs replacement. [, 2]
Recommended Troubleshooting Steps
- Clear the Sink Spigot: Disconnect the machine's gray ribbed drain hose from under your sink trap. Check the plastic spigot it hooks onto; a buildup of grease or hair right at that junction can cause a slow drain restriction.
- Clear the Breather Hole: Poke a flexible item into the internal air gap hole inside the pump housing to clear any hidden blockages.
- Execute a Boil Wash: Run an empty 95°C cycle with a heavy-duty cleaner to clear out the pressure chamber. [1, 2, 3, 4, 5]
If you are comfortable with basic DIY repairs and would like to proceed, please let me know
the exact model number (found on a sticker just inside the door rim) so I can guide you through the process or advise on the correct replacement parts.
Andy
