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Nutone Range vent hood turning on by itself

When your NuTone range vent hood turns on by itself, the thermostat is the most likely cause. Some hoods use a thermostat to start the vent blower automatically when heat builds up, then shut it off after the temperature drops. Check your owner's manual and wiring diagram to confirm whether your NuTone range vent hood has this feature. If automatic operation is not expected, the control board is the next likely problem. Burned relay contacts or a shorting board can send intermittent power to the blower or lights, making them turn on and off randomly. A worn touchpad, user control and display board, or main control board can also send false signals when a button circuit activates intermittently. The control module is less common, so test the control panel and switches before replacing it. Disconnect power before testing or replacing electrical parts, and use your model number to find the exact thermostat, control board, touchpad, or other replacement part for your specific NuTone range vent hood.

01 - Nutone 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 - Nutone 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 - Nutone 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 - Nutone 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 - Nutone 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 - Nutone 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 does my NuTone range vent hood turn on by itself?

Could the thermostat be causing my NuTone range vent hood to turn on by itself?

How do I test the touchpad when my NuTone range vent hood turns on by itself?

Should I replace the NuTone range vent hood control board first?

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

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