The part(s) or condition(s) listed below for the symptom Range vent hood turning on by itself are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
Top 6 Reasons Range Vent Hood Not Venting?
Top 5 Reasons Range Vent Hood Lights Not Working?
Top 3 Reasons Retractable Range Vent Not Working?
Top Reasons Range Vent Hood Touchpad Not Working?
Top 4 Reasons Range Vent Hood Fan & Lights Not Working?
Replace Range Vent Hood Grease Filters - Tech Tips from Repair Clinic
Range Vent Hood Hums? Range Vent Hood Troubleshooting
Range Vent Hood Loud or Noisy? Range Vent Hood TroubleshootingIf 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.
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.
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.
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.
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.
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.
The controls on the panel may be intermittently touching, turning off the vent hood. If the buttons or controls work intermittently, replace the touchpad and control panel.
