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Sanyo Microwave turns on by itself

If your Sanyo microwave is turning on by itself, first check whether only the vent fan is running. On most over-the-range microwaves, a vent fan thermostat automatically starts the fan during stovetop cooking to cool the microwave and shuts it off once the unit cools. If the touchpad works normally but the microwave starts a cooking cycle or responds incorrectly, the main control board is the most likely failed part. A malfunctioning interlock switch can also cause a microwave to turn on by itself, so test the primary and secondary door switches with a multimeter. Next, inspect the switch holder behind the control panel. If it is damaged or misaligned, the door switches may not engage correctly. Less commonly, intermittent contact between circuits in the touchpad and control panel, or in the touchpad itself, can send an unintended start signal. Replace the defective control board, interlock switch, switch holder, touchpad, or control panel as needed. Enter your model number to find the exact replacement part for your Sanyo microwave. Any repair that opens the outer cabinet or control panel requires caution because the high-voltage capacitor can store a lethal charge even after unplugging. It must be properly discharged, and unfamiliar DIYers should use a qualified technician.

01 - Sanyo 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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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 - Sanyo 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 - Sanyo 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 - Sanyo 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.
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Less Common

06 - Sanyo 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.
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Less Common

Frequently Asked Questions

Why does my Sanyo microwave turn on by itself?
Why does my over-the-range microwave fan turn on by itself?
Can a Sanyo microwave touchpad or control panel cause it to turn on by itself?
How do I test the Sanyo microwave interlock switch and switch holder?
How do I find the correct Sanyo microwave replacement part?

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