Fault Code F12: Water Intake Fault At Start Of Step - Miele G 4205 Technical Information

G 5xxx
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 050-4.17).
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 050-4.16.
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. See Section 050-4.10.
3.12

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 "Intake/Drain" LED
flashes (depending on model). The water inlet valve will be activated at 10-
second intervals for one hour. The drain pump will also be activated at
intervals to prevent the possibility of the appliance overflowing. All other
components remain inactive. If these attempts to achieve the minimum pulse
rate fail, the buzzer is activated for 2 minutes.
Cause:
On-site shutoff valve (water supply) closed.
Remedy:
Open the shutoff valve.
Cause:
On-site water supply not in order (water pressure below 14.5 pounds per
square inch).
129
Technical Information