Microwaves are now in nearly every home. They are a must-have appliance that many people use to help them cook. When they stop working as they are supposed to, it can be annoying and costly if you have to repair or replace them.
One way microwaves can stop working correctly is when they won’t turn off when they are supposed to. It doesn’t happen that often, but it can happen. The good news is this problem is only caused by a couple of possible faulty components, so it’s quite straightforward to find the cause of the problem and fix it.
If your microwave won’t turn off, the cause may depend on whether the microwave door is open or if the door is closed.
So, if your microwave won’t turn off, there are two parts that you have to test and repair: the door interlock switch and the control board. All you have to do is follow our step-by-step guide below to diagnose and fix each component.
Microwaves are extremely dangerous to work on due to the risk of electrical shock. We highly recommend only people with the proper training undertake the tests we have outlined below. If in doubt, you should contact a qualified technician to help you with this repair.
The door interlock switch is responsible for supplying power to other components in your microwave, and when the door opens, it shuts off power to these components, effectively shutting the microwave off. The switch is activated by a hook or latch that is on the door. When the switch fails, your microwave will keep working even when you open the microwave door.
Here’s how to test the door interlock switch:
The control board controls your microwave by sending power to the relays. When your microwave keeps working even after you press the “stop” button, this is a good sign the control board is faulty. It is possible to keep using a microwave even when this occurs, but it’s not ideal – you should replace the control board.
Here’s how to test the control board:
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