Breville
No Start – Control or Door Interlock Logic Fault
Microwave display is on but pressing START does nothing; no relay click, no fan, no light change.
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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, Failed control PCB relay, Door not fully closed or misaligned, Defective door interlock switch
How to Fix / Troubleshooting
Safety: Unplug the microwave before cleaning or moving it.
User-level steps:
- 1. Confirm door closure: Open and firmly close the door. Ensure nothing is trapped in the door seal.
- 2. Test other buttons: Try setting the clock or using other functions to see if the keypad responds. If only START fails, the keypad may be worn.
- 3. Child lock: Check the user manual for child lock instructions. Some Breville models require holding a specific key (e.g., STOP/CLEAR) to toggle lock mode.
- 4. Power reset: Unplug for 5–10 minutes, then plug back in and test again.
If the unit still will not start, the door interlock switches or control board may need professional diagnosis and replacement.
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Repair Difficulty
Medium
3/5
Required Part
Control Panel / Keypad Assembly
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