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We have a Miele G1220SC dishwasher, about 4-6 yrs old (can't find receipt to confirm age). Just recently it keeps flashing the F11 code - water remains in cabinet. All filters are clean, as is pump housing and ball valve seat, no kinks in hose. Machine has always been cleaned/disinfected every week etc.
It works perfectly well and then every now and then fails to fully pump out the water and up comes F11.
Is it possible some other part is beginning to wear out and I need to get an engineer in to fix it, would like to know in advance what the problem might be so as not to be led up the proverbial !
F11 Drainage fault Water present in appliance and is not being drained off. The display shows
Drain fault F11. The buzzer is activated for 2 minutes.
After each drain pump step, the circulation pump operates for 2 seconds and heater pressure switch B1/13 checks the water level. If it is too high (large quantity of residual water remaining in the cabinet), the drainage time is extended. If, after a further check, the water level is still too high, then the program is interrupted, the fault code is saved and the drain pump is activated. Fault code F11 is also registered if heater relay 1K1 is not activated after the fault code F51 register check; see Section 080-3.18. Drain hose kinked. Remedy: Check the drain hose for correct positioning. Cause: Drain blocked.
1. Clean the on-site drain.
2. Check the sump drain.
3. Check the filters.
4. Check the heater pressure switch and replace it if necessary.
Ball in non-return valve in sump has not opened (e.g., jammed).
Clean the non-return valve in the sump or replace it if necessary. Cause: Foreign objects in the drain pump.
Clean the drain pump and its impeller.
Drain pump defective.
1. Check the voltage supply to the drain pump.
2. If correct voltage is present, check the drain pump motor winding.
3. Replace the drain pump, if necessary.
Foreign objects in heater pressure switch.
Check the heater pressure switch for blockages and correct switching point.
Heater relay defective. Heater relay (coil or contacts) becomes defective during the drainage step (after fault code F51 register check).
Thank you for such a full and comprehensive answer.
It looks like I have done as much as I can so any further electrical checks on components and dismantling will have to be done by an engineer. Only fault code to show is F11 so far so it can't be too bad. I will double check everything again.