Miele
Start Circuit / Door Interlock Logic Fault
Microwave light and display work, but pressing Start does nothing (no relay click, no fan).
Advertisements
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.
Advertisements
Possible Causes
Faulty Start button on keypad, Door not detected as closed due to bad switch, Control board relay failure, Child lock enabled
How to Fix / Troubleshooting
Safety first: Unplug the microwave before removing the control panel or door components.
- Check child lock: Look for a key symbol or "LOC" on the display. Disable the lock according to the user manual.
- Verify door closure: Ensure the door is fully closed and latches firmly. Try gently lifting or pressing the door while pressing Start.
- Test other keys: If only the Start key is unresponsive, the keypad may be faulty.
- Inspect door switches (advanced): Test door interlock switches with a multimeter and replace any that do not change state correctly.
- Control relay: If switches and keypad are good, the main control board’s power relay may have failed and will need replacement.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Door Interlock Switch Assembly
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements