Miele Dishwasher Fault Code F12 Meaning and Possible Fixes
Miele Dishwasher Fault Code F12
If your Miele dishwasher displays fault code F12, the appliance has detected that the water inlet is blocked or restricted. There are checks you can carry out yourself before calling an engineer.
View all Miele dishwasher fault codes
What the F12 Fault Code Means
The F12 fault code indicates a water intake fault at the start of a fill step — the machine is not receiving enough water to proceed with the programme. Miele advises that the most common cause is a blocked or restricted inlet filter at the water supply connection, and this can be cleaned by the user.
Common Reasons This Fault Appears
Blocked inlet filter
A filter is located inside the water intake valve connection at the back of the machine. Over time, debris from the water supply can accumulate and restrict water flow.
Stopcock turned off or partially closed
If the water supply stopcock is closed or not fully open, the machine will not receive enough water to fill correctly.
Kinked or blocked inlet hose
A kinked, crushed or blocked water inlet hose can restrict water flow into the machine.
Low water pressure
Unusually low household water pressure can prevent the machine from filling at the required rate.
Safe Checks You Can Try
Check the stopcock
Ensure the water supply stopcock is fully open.
Clean the inlet filter
Switch the dishwasher off and disconnect from the mains. Close the stopcock. Unscrew the water intake valve connection from the stopcock. Remove the seal from the screw connection. Using combination or pointed pliers, carefully take hold of the plastic filter bar and remove the plastic filter. Rinse the filter thoroughly under running water. Re-insert the filter and seal into the screw connection, ensuring both are seated correctly. Screw the connection back onto the stopcock securely. Slowly turn the stopcock back on and check for drips — tighten the connection if necessary.
Check the inlet hose
Ensure the inlet hose is not kinked or crushed behind the machine.
Restart the dishwasher
After completing the above checks, switch the machine back on and restart the programme.
If You Need Spare Parts
If you are confident carrying out the repair yourself, compatible Miele dishwasher parts are available on Amazon with next day delivery.
Always check your model number before ordering to ensure compatibility.
When To Contact A Professional
If the F12 fault persists after cleaning the inlet filter and checking the water supply, the water inlet valve may have failed and will need to be replaced by a qualified engineer.
Internal components should only be inspected or repaired by trained professionals.
Related Miele Dishwasher Fault Codes
You may also encounter related issues indicated by Miele Dishwasher Fault Code F13 and Miele Dishwasher Fault Code F15.
Fault codes may vary slightly between different Miele dishwasher models, so always consult the manufacturer documentation for your specific appliance.
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