Miele Dishwasher Error Code F42

F42Miele Dishwasher

What this code means

Line frequency registration fault - main power supply frequency cannot be clearly established as either 50 Hz or 60 Hz range. Possible causes: Main power supply not in order; Power frequency outside valid ranges (50 ± 5 Hz or 60 ± 5 Hz)

Next steps: diagnose the root cause

1
Verify the error code is active

Power cycle the unit and see if the code returns. If it does, the fault is persistent and requires diagnosis.

2
Get the full diagnostic procedure

Get step-by-step guidance, test values, and wiring diagrams from the OEM service manual.

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