F40
Miele
Phase / Frequency / Mains Configuration Error
F40 displayed; cooktop or range may not start; sometimes appears after installation or power outage.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect connection of phases (L1/L2), Wrong mains frequency or unstable supply, Misconfigured jumper on terminal block, Internal mains monitoring circuit fault
How to Fix / Troubleshooting
Safety: Only a licensed electrician should modify mains connections. Turn off power at the breaker before opening the terminal cover.
- Verify wiring: Compare the actual wiring at the terminal block to the Miele installation diagram for your model and region (single‑phase vs. three‑phase).
- Check jumpers: Ensure factory jumpers are installed correctly between terminals where required.
- Measure voltage: Confirm correct voltage between phases and neutral, and that frequency is within spec (50/60 Hz).
- Reset appliance: After correcting wiring, turn power off for 5 minutes, then restore and test.
- Control fault: If wiring and supply are correct but F40 persists, the mains monitoring circuit on the control module may be defective and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Mains Terminal Block
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