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Hitachi Microwave Turns on by Itself

The part(s) or condition(s) listed below for the symptom Microwave turns on by itself are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Microwave turns on by itself

For the most accurate results, enter your model number.


Cause 1Main 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.

Parts
Cause 2Microwave cooling down during stovetop cooking

Most over-the-range microwaves have a vent fan thermostat that will turn the vent fan on to keep the microwave from overheating. It is normal for the vent fan to come on by itself when cooking on the stovetop under the microwave. The fan will shut off after the microwave cools back down.

Cause 3Interlock 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.

Parts
Cause 4Switch 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.

Parts
Cause 5Touchpad 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.

Parts
Cause 6Touchpad

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.

Parts
Cause 7Door Hinge

A bent microwave door hinge can cause the door to sag which may inadvertently allow some of the door switches to open and close. This may cause the lights to come on and off intermittently. Inspect both door hinges for damage and replace if necessary.

Parts
Cause 8Door Switch

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

Parts
Cause 9Micro Switch

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

Parts