Fault Code F12: Water Intake Fault At Start Of Step - Miele G 1 Series Technical Information

G 1xxx/G 2xxx
specialist.
If water does not flow from the drain hose, then check the filters.
1. Clean the on-site drain.
2. Check the sump drain.
3. Check the filters for blockage.
4. Check the heater pressure switch and replace it if necessary. See Section
050-4.20
Cause:
Ball in non-return valve in sump has not opened (e.g., jammed).
Remedy:
Check the non-return valve for blockage, clean or replace if necessary.
Clean the non-return valve in the sump or replace it if necessary.
Cause:
Drain pump defective.
Remedy:
With the non-return valve removed, check the drain pump for proper
operation by performing the following steps:
1. Check the drain pump impeller blades for proper rotation. If stuck, look for
foreign objects blocking impeller blades. If impeller blades are jammed
and no foreign objects are found, proceed to the next step.
2. Remove the lower service door panel.
3. Operate the dishwasher in a drain step.
4. Check for power at the drain pump. If pump is receiving power, then
replace the drain pump. If not, check wiring from electronic to the drain
pump. Replace or repair as necessary (Section 050-4.22).
Cause:
Foreign objects in heater pressure switch.
Remedy:
Check the heater pressure switch for blockages and correct switching point.
Ensure that the contacts are in the correct position after a drain step. Replace
if necessary. See Section 050-4.20.
Cause:
Heater relay defective.
Heater relay (coil or contacts) becomes defective during the drainage step
(after fault code F51 register check).
Remedy:
Replace the heater relay.
3.14

Fault Code F12: Water Intake Fault at Start of Step

Symptom:
During the first 5 seconds of any water intake step, at least 15 pulses from
flow meter B3/4 should be registered. If this given number of pulses is not
detected, the display reads Water inlet fault and/or the "Intake/Drain" LED
flashes (depending on model). The water inlet valve will be activated at 10-
141
Technical Information