Miele Dishwasher Fault Code F42 Meaning and Possible Fixes
Miele Dishwasher Fault Code F42
If your Miele dishwasher displays fault code F42, the appliance has detected a line frequency registration fault that cannot be resolved without professional assistance.
View all Miele dishwasher fault codes
What the F42 Fault Code Means
The F42 fault code indicates that the dishwasher’s control electronics have failed to correctly register the mains supply frequency. The control board monitors the frequency of the mains electricity supply as part of its normal operation, and when this registration fails, the machine stops the programme. Miele confirms this is a technical fault that cannot be remedied by the user.
Common Reasons This Fault Appears
Control board fault
A fault within the main electronic control module — specifically the circuit responsible for monitoring mains frequency — is the most likely cause of F42.
Power supply issue
An unstable or interrupted mains supply can occasionally cause this fault to appear, particularly if there has been a power surge or fluctuation.
Wiring fault
A loose or damaged electrical connection within the control circuit can cause this fault to appear.
Safe Checks You Can Try
Check the power supply
Ensure the dishwasher is plugged directly into a wall socket rather than an extension lead. Check that the socket is functioning correctly.
Restart the dishwasher
Switch the machine off at the mains and leave it unplugged for a few minutes. Reconnect the power, switch back on and restart the programme. A power reset can sometimes clear a temporary fault caused by a mains supply fluctuation.
Miele advises that if the fault persists after a reset, the appliance cannot be repaired without professional assistance.
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
Miele advises that fault F42 is a technical fault that cannot be resolved without professional assistance. An engineer will need to diagnose and replace the faulty control board or associated components.
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 F40 and Miele Dishwasher Fault Code F47.
Fault codes may vary slightly between different Miele dishwasher models, so always consult the manufacturer documentation for your specific appliance.
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