Haier
Start circuit / door interlock logic fault
Microwave display works but it will not start when pressing Start
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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
Faulty Start button on keypad, Defective door switch not signaling closed, Control board relay failure, Child lock enabled
How to Fix / Troubleshooting
Safety: Unplug the microwave before panel removal.
- Check child lock: Look for a lock icon on the display. Disable child lock according to the user manual (often by holding a specific key for several seconds).
- Door closure: Ensure the door is fully closed and latched. Try opening and closing firmly, then press Start again.
- Test keypad: Try other functions (e.g., setting the clock). If some keys do not respond, the keypad may be failing.
- Inspect door switches (advanced): If the keypad seems fine, the door switch assembly may not be signaling properly. A technician can test and replace the faulty switch or control relay.
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Repair Difficulty
Medium
3/5
Required Part
Membrane Keypad or Door Switch Assembly
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