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).
Replace the heater relay.