LG
Start Circuit or Door Interlock Not Engaging
Microwave display is on but START button does nothing; timer does not count down and no relay click is heard.
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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 key on keypad, Failed membrane keypad, Door switch not signaling closed, Defective main PCB relay drive
How to Fix / Troubleshooting
Safety: Unplug the microwave before any physical manipulation of the control panel or door.
Steps:
- Check door status: Ensure the display does not show DOOR or OPEN. Open and close the door firmly and try again.
- Test other keys: See if other buttons (e.g., numbers, STOP/CLEAR, CLOCK) respond. If only START fails, the keypad may be worn.
- Child lock: Make sure child lock (LOC) is not active; disable it if necessary.
If the keypad is unresponsive or the unit still will not start, the keypad or door switch assembly likely needs professional replacement.
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Repair Difficulty
Hard
4/5
Required Part
Membrane Keypad
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