Recognizing a failing or broken door interlock microswitch inside a residential microwave oven involves observing specific operational anomalies. Common symptoms include the microwave refusing to start even when the door is firmly shut, the interior light staying on or failing to turn on when the door closes, or the microwave running for only two to three seconds before abruptly shutting off mid-cycle due to lost electrical contact. You can troubleshoot door switches safely using a digital multimeter set to continuity. You can verify that your switch is bad when confirming that it fails to close its electrical contacts when the door latch engages, proving that you must replace the faulty microswitch.
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