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Gaggenau Microwave turns on by itself

If your Gaggenau microwave is turning on by itself, first determine whether the microwave is actually starting a cooking cycle or whether only the vent fan is running. On an over-the-range model, the microwave fan turns on by itself during stovetop cooking when the vent fan thermostat senses excess heat, then shuts off after the microwave cools. If the touchpad works correctly and the unit starts without a command, the main control board is the most likely failed part. A defective interlock switch can also cause a microwave to turn on when the door opens or closes, while a damaged or misaligned switch holder may prevent the door switches from engaging correctly. Less common causes include intermittent contact between circuits in the touchpad and control panel, or a faulty touchpad alone. Inspecting the switch holder or replacing the main control board, touchpad, or control panel requires opening the cabinet or removing the control panel. Unplug the microwave first, and remember that its high-voltage capacitor can store a lethal charge even after power is disconnected. Proper capacitor discharge is required before interior work, so use a qualified technician if you are not familiar with the procedure. Enter your Gaggenau model number to find the exact replacement part for your microwave.

01 - Gaggenau 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 - Gaggenau 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 - Gaggenau 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 - Gaggenau 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 - Gaggenau 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 Gaggenau microwave turn on by itself?
Can a Gaggenau microwave fan turn on by itself during stovetop cooking?
How do I test a Gaggenau microwave interlock switch or switch holder?
How do I know whether the Gaggenau touchpad or control board is causing the microwave to turn on by itself?
How do I find the correct Gaggenau microwave replacement part?

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