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Samsung Microwave turns on by itself

If your Samsung microwave turns on by itself, first check whether the touchpad responds correctly. If it does, the main control board is the most likely cause and may need replacement. On Samsung over-the-range microwaves, the vent fan can also turn on automatically while you cook on the stovetop. A vent fan thermostat activates it to prevent overheating, and the fan should shut off after the microwave cools. If the microwave or fan starts unexpectedly at other times, a faulty interlock switch is the next likely cause. A damaged or misaligned switch holder behind the control panel can prevent the door switches from engaging correctly. Less commonly, intermittent contact in the touchpad and control panel circuits, or in the touchpad itself, can send a false start signal. Test the interlock switches with a multimeter and inspect the switch holder before replacing parts. Enter your model number to find the exact Samsung replacement part for your microwave. Any repair that requires removing the outer cabinet must be handled carefully because the high-voltage capacitor stores a lethal charge even after the microwave is unplugged. It must be properly discharged before interior work, and a qualified technician should perform the repair if you are not familiar with capacitor discharge procedures.

01 - Samsung Microwave Main Control Board

First, make sure that the touchpad is working properly. If the touchpad is working properly, the main control board is likely at fault. If the control board is defective, replace it.
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Shop all Samsung Microwave Main Control Board Parts
Top Solution

02 - Microwave cooling down during stovetop cooking

Most over-the-range microwaves have a vent fan thermostat that will turn the vent fan on automatically to keep the microwave from overheating. The fan will shut off after the microwave cools back down.
Highly Likely

03 - Samsung Microwave Interlock Switch

A microwave that turns on by itself can be caused by a malfunctioning interlock switch. You can use a multimeter to test the interlock switches to determine if they are functioning appropriately and replace if necessary.
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Common

04 - Samsung Microwave Switch Holder

The microwave switch holder is the component that houses the door switches behind the control panel. If the switch holder is damaged or misaligned, the switches may not be properly engaged which could cause the microwave to turn on by itself. You will need to uninstall the control panel and inspect the switch holder to confirm it is in good condition and secured properly. Replace the switch holder with a new one if necessary.
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Common

05 - Samsung Microwave Touchpad and Control Panel

It’s possible that the touchpad and control panel button circuits are coming into contact with each other intermittently which could cause the microwave to turn on by itself. If this happens, the touchpad and control panel will need to be replaced.
Shop all Samsung Microwave Touchpad and Control Panel Parts
Less Common

06 - Samsung Microwave Touchpad

It’s possible that the touchpad button circuits are coming into contact with each other intermittently which could cause the microwave to turn on by itself. If this happens, the touchpad will need to be replaced.
Shop all Samsung Microwave Touchpad Parts
Less Common

Frequently Asked Questions

Why does my Samsung over-the-range microwave fan turn on by itself?
Why does my Samsung microwave turn on by itself or turn on when the door opens?
How do I test a Samsung microwave interlock switch or switch holder?
Can a Samsung microwave touchpad or control panel make the microwave turn on by itself?
How do I find the correct Samsung microwave part for this problem?

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