How to Replace a Downdraft Vent Up/Down Switch



This DIY repair guide explains how to replace the up/down switch on a downdraft vent. The up/down switch, also called a position switch, activates the gear motor to raise and lower the vent when you push the switch button. If the up/down switch won't start the gear motor, replace with switch with the manufacturer-approved replacement part.

Use these steps to replace the up/down switch in Kenmore and Broan downdraft vents.

Repair difficulty:
Time required:

Less than 15 min.

Parts Required

  • Up/down switch

For manuals, repair guides, and specific part recommendations, enter your model number.

Tools Required

  • Work gloves
  • Phillips screwdriver
  • Wire cutter

Before you begin

Wear work gloves to protect your hands.


 Warning: Undertaking repairs or maintenance to appliances or power equipment can be hazardous. Should you choose to undertake repairs or maintenance, you are assuming the risk of injury to your person or property. In an effort to reduce the risk, use the proper tools and safety equipment noted in the applicable guide and follow all instructions. Do not proceed until you are confident that you understand all of the steps and are capable of completing the repair. Some repairs or maintenance, however, should only be performed by a qualified technician.

How to Replace the Up/Down Switch on a Downdraft Vent System

Step 1: Raise the air vent

Push the up/down button to raise the vent.


If the air vent won't rise, pull it up manually and prop up the vent with a block of wood.

Step 2: Shut off the electricity

Unplug the power cord from the wall outlet.

Step 3: Remove the switch cover

Remove the mounting screws and pull the switch cover off.

Step 4: Pull out the switch bracket

Remove the screws from the switch bracket.


Slide the switch bracket down and then pull the bracket out.

Step 5: Remove the speed control switch

Pull the knob off the speed control switch stem.


Remove the speed control switch mounting nut.


Pull the speed control switch out of the switch bracket.

Step 6: Remove the up/down switch

Disconnect the up/down switch wires.


Cut off the wire tie to release the up/down switch and speed control switch wires from the switch bracket.


Remove the up/down switch and switch bracket.


The new up/down switch includes a new switch bracket.

Step 7: Install the new up/down switch

Secure the speed control and up/down switch wires to the new switch bracket using a wire tie.


Connect the up/down switch wires to the up/down switch.

Step 8: Reinstall the speed control switch

Reinstall the speed switch on the switch bracket and secure it using the mounting nut.


Reinstall the speed control knob on the stem of the speed control switch.

Step 9: Install the switch bracket

Slide the switch bracket into the vent and reinstall the bracket screws, leaving the screws loose.


Adjust the switch bracket so that the activation switch lightly touches the membrane pad and then tighten the bracket screws firmly.

 Warning: Don't pinch any switch wires when installing the switch bracket.

 Tip: Mounting the switch bracket up too high will keep the switch depressed and the vent will raise and lower continuously when power is restored.

Step 10: Reinstall the switch cover

Reinstall the switch cover and secure it using the mounting screws.

Step 11: Restore power

Reconnect the power cord.