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Bosch Range vent hood turning on by itself

If your Bosch range vent hood is turning on by itself, the thermostat is the most likely cause. Some hoods automatically start the vent blower when the temperature inside the hood becomes too high, then shut it off after the area cools. Check your owner's manual and wiring diagram to confirm whether your Bosch range vent hood has this feature. If the blower or lights turn on and off randomly, the control board may have burnt relay contacts or an internal short. A worn touchpad can also close a circuit intermittently and send an unwanted signal to the control board. Next, test the user control and display board by pressing each control button. Buttons that do not respond correctly can indicate a defective board. The main control board can cause the same intermittent operation, while a shorted control module may activate the blower or lights at random. Test the control panel and switches before replacing the less common control module. Enter your Bosch range vent hood model number to find the exact thermostat, control board, touchpad, or other replacement part that fits your appliance.

01 - Bosch Range Vent Hood Thermostat

If the temperature in the hood gets hot there may be a thermostat that will automatically turn on the vent blower until the temperature cools down. Check the owner's manual and /or the wiring diagram to see if your vent hood has this feature.

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Highly Likely

02 - Bosch Range Vent Hood Control Board

The control board has relays that send power to the fan and lights. If the contacts in the relays become burnt, or the board is shorting out, they may make contact intermittently. If the fan or lights are turning off and on the control board may be bad.

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Common

03 - Bosch Range Vent Hood Touchpad

When the touchpad buttons are pressed a circuit is closed sending a signal to the control board. If the button is worn it can cause the circuit to close intermittently, turning on the hood.

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Common

04 - Bosch Range Vent Hood User Control and Display Board

The buttons on the user control and display board may be only intermittently activating. To determine if the control and display board is defective, try pressing each of the buttons on the control panel. If some of the buttons are not responding correctly, replace the user control and display board.

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Common

05 - Bosch Range Vent Hood Main Control Board

The main control board has relays that send power to the fan and lights. If the contacts in the relays become burnt, or the board is shorting out, they may make contact intermittently. If the fan or lights are turning off and on, the main control board may be bad.

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Common

06 - Bosch Range Vent Hood Control Module

The control module receives inputs from the control panel switches to turn the lights and blower on and off. If the control module shorts out, the blower or lights may go on and off randomly. Because this is not a common problem make sure the control panel and switches are tested before replacing the control module.

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Common

Frequently Asked Questions

Why is my Bosch range vent hood turning on by itself?

How do I stop my Bosch range vent hood from turning on by itself?

Could the Bosch range vent hood touchpad or control panel be causing the problem?

When should I replace the Bosch range vent hood control board?

How do I find the correct Bosch range vent hood replacement part?

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