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Haier Microwave turns on by itself

When your Haier microwave turns on by itself, first determine whether you are hearing the exhaust fan or the microwave is actually starting a cooking cycle. On an over-the-range microwave, the vent fan may turn on automatically during stovetop cooking when its thermostat senses heat, then shut off after the microwave cools. If the touchpad works correctly but the microwave starts without a command, the main control board is the most likely cause and may need replacement. A faulty interlock switch can also send the wrong door signal and cause the microwave to turn on by itself. Inspect the switch holder behind the control panel for damage or misalignment, since it may prevent the door switches from engaging properly. Less commonly, intermittent contact in the Haier touchpad or control panel button circuits can trigger operation, requiring replacement of the touchpad, control panel, or both. Enter your microwave's model number to find the exact replacement part for your specific Haier microwave. If any repair requires opening the outer cabinet, unplug the microwave first and remember that the high-voltage capacitor can store a lethal charge even when unplugged. It must be properly discharged before interior work, so use a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Haier 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 - Haier 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 - Haier 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 - Haier 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 - Haier 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 Haier Microwave Touchpad Parts
Less Common

Frequently Asked Questions

Why does my Haier microwave turn on by itself?
Why does my Haier microwave fan turn on by itself?
How do I test a Haier microwave interlock switch or switch holder?
Could a Haier microwave touchpad or control board cause it to turn on by itself?
How do I find the right replacement part for my Haier microwave?

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