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Thermador Range vent hood turning on by itself

If your Thermador range vent hood turns on by itself, the thermostat is the most likely cause. Some vent hoods have a temperature-sensing thermostat that automatically starts the blower when heat builds up in the hood, then shuts it off after the temperature drops. Check your owner's manual or wiring diagram to confirm whether this feature is normal for your model. If the hood starts randomly when it is not hot, a failing control board may have burnt relay contacts or a short that sends intermittent power to the blower or lights. A worn touchpad can also close a circuit without being pressed, while a defective user control and display board may activate buttons intermittently. Test the control panel buttons and replace the board if they do not respond correctly. The main control board can cause the same random operation, and a shorted control module is possible but less common. Disconnect power before testing or replacing parts. Enter your Thermador range vent hood model number to find the exact replacement thermostat, control board, touchpad, or other part that fits your appliance.

01 - Thermador 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 - Thermador 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 - Thermador 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 - Thermador 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 - Thermador 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 - Thermador 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 Thermador range vent hood turning on by itself?

How do I troubleshoot a Thermador range vent hood that turns on randomly?

Can a bad touchpad cause my Thermador vent hood to turn on by itself?

Should I replace the Thermador range vent hood control board?

How do I find the correct Thermador range vent hood part?

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