Introduction
A microwave door switch is a safety component that prevents the microwave from running when the door is open. The switch works together with the door latch to confirm that the microwave door is securely closed before the appliance begins operating.
Although the switch is small, it plays a critical role in microwave safety.
What Happens When the Door Closes
When you close the microwave door, the door latch hooks enter the microwave frame and press against the switches inside the front panel.
These switches signal to the microwave control system that the door is closed and it is safe to operate the appliance.
If the switches do not activate correctly, the microwave will usually refuse to start.
For a full overview of the component, see:
Complete Guide to Microwave Door Switch
Why the Door Switch Is Important
The door switch prevents the microwave from running with the door open.
Without this safety system, microwave radiation could escape while the appliance is operating.
Because of this safety role, the microwave control system will stop the appliance from running if the switch does not detect a properly closed door.
Symptoms of a Faulty Door Switch
When the door switch begins to fail, several symptoms may appear.
Common symptoms include:
• Microwave will not start
• Microwave stops immediately after pressing start
• Microwave runs only when the door is pushed closed
• Microwave display works but cooking does not begin
You can review these symptoms in detail here:
Signs a Microwave Door Switch Is Bad
How to Confirm the Switch Is Faulty
The most reliable way to confirm a faulty switch is to test it with a multimeter.
Testing checks whether the switch opens and closes correctly when pressed.
The full procedure is explained here:
How to Test a Microwave Door Switch
Related Guides
Signs a Microwave Door Switch Is Bad