Why Does My Microwave Keep Running When The Door Is Closed?

Fixing A Microwave Door That Won’t Close Appliance Tec
Fixing A Microwave Door That Won’t Close Appliance Tec from appliancetec.com


If you’ve ever experienced the frustration of a microwave that continues to run even when the door is closed, you’re not alone. This common issue can be both annoying and potentially dangerous. In this article, we will explore the possible reasons why your microwave is behaving this way and provide some tips on how to troubleshoot and fix the problem.

1. Faulty Door Switches

One of the most common causes of a microwave running with the door closed is faulty door switches. These switches are responsible for detecting whether the door is open or closed, and if they malfunction, the microwave may not receive the signal to stop heating. To fix this issue, you will need to replace the faulty door switch or switches.

How to Fix It:

To replace the door switch, you will need to first unplug the microwave and remove the outer cover. Locate the door switches, which are usually located near the latch mechanism, and disconnect the wiring. Remove the old switch and install the new one, reconnecting the wiring as necessary. Finally, reassemble the microwave and test it to ensure the issue is resolved.

2. Stuck Relay

Another possible cause of a microwave continuing to run with the door closed is a stuck relay. A relay is an electrical component that controls the flow of power to the microwave’s heating elements. If the relay gets stuck in the closed position, it can cause the microwave to keep running even when it shouldn’t.

How to Fix It:

To fix a stuck relay, you will need to access the control board of your microwave. Unplug the appliance and remove the outer cover to locate the control board. Look for the relay and gently tap or wiggle it to free it from the stuck position. If tapping doesn’t work, you may need to replace the relay altogether.

3. Control Panel Malfunction

In some cases, a malfunctioning control panel can also cause a microwave to continue running with the door closed. If the control panel’s circuitry is damaged or there is a software glitch, it may not receive the signal to stop heating when the door is closed.

How to Fix It:

Unfortunately, fixing a control panel malfunction is not a DIY task and requires professional assistance. Contact a qualified technician who specializes in microwave repairs to diagnose and repair the control panel issue.

4. Other Possible Causes

There are a few other less common causes that could result in a microwave running with the door closed. These include a faulty interlock switch, a defective control board, or a wiring issue. If you’ve ruled out the previous causes and the problem persists, it’s best to consult a professional technician for further diagnosis and repair.


A microwave that continues to run with the door closed can be a frustrating and potentially dangerous issue. By understanding the possible causes and following the troubleshooting steps outlined in this article, you can hopefully resolve the problem and ensure the safe and proper functioning of your microwave.