f42
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Miele · Dishwashers
Mains frequency registration fault
Quick Answer
Error code F42 on your Miele Dishwashers means: Mains frequency registration fault. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Check the household power supply for inconsistencies (flickering lights, tripping breakers).
2
Ensure the dishwasher is on a dedicated circuit.
3
Turn off and restart the dishwasher.
4
If the error persists, a technician must check the control board and power supply circuits.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Control board
Power line filter
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