If your microwave doesn’t shut off when you open the door, it may be a problem with the door interlock switch. A functioning door switch provides power to other components of the microwave and should interrupt power when the door is open. The components that could stay on when the door is open, but the door switch isn’t working are the fan motor, stirrer motor, and interior light. There is a hook or latch on the microwave door which activates the door switch, located inside the cabinet. Similar to other tests, begin by verifying that you have disconnected your appliance from the power source. Locate and remove the door interlock switch to test it for continuity. You will need to remove the microwave’s cabinet in order to access it. Using a multimeter set to Rx1, ensure the button is depressed and touch the terminals with the meter’s probes, you should receive a reading of zero or nearly zero, indicating that there is continuity. Next, with the probes still touching the terminals, ensure the button is not pushed in, this test should indicate that there isn’t continuity. If your test results differ from those above, you will need a replacement door interlock switch. Regular microwave maintenance is important to get good operation from your appliance and extend its lifespan. You should set up a weekly and monthly maintenance schedule. Preventative care, even in small amounts, will help save on expensive repairs or even a microwave replacement later on.
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