Leaving a microwave oven door open or failing to close it completely prevents the appliance from operating, as built-in safety interlock microswitches keep the electrical circuit open to prevent high-voltage power from reaching the magnetron tube. Furthermore, leaving the door open leaves the internal cooking cavity light illuminated continuously, which can burn out the incandescent or LED bulb and drain power if left unaddressed. You can troubleshoot door sensor issues easily. You can verify that your corrective action is successful when pushing the door firmly closed causes the interior light to turn off automatically, indicating that the safety interlock switches have successfully registered the closed position.
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