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How do I replace a Vent Blower Motor in a Downdraft Ventilation System?

Check for loose mounting nuts and fan brackets if the blower motor has loud noises when running. The blower wheel is likely unbalanced if the fan and mounting nuts are tight.

Check the limit switches and the fan control switch if the blower fan motor doesn't run after the vent pops up. The blower motor should be replaced if the switches are ok.

The fan control switch can't change the motor speeds or turn the blower motor off. Check the limit switches if the blower motor won't run.

The pop-up vent is lowered by the gear motor. Check the mechanism for binding if the gear motor doesn't hum or raise the pop-up vent. The gear motor should be replaced if the pop-up vent isn't jammed.

Follow these steps to fix your issue:

  1. Disconnect power and remove the downdraft vent from the counter.

    The downdraft vent can be unplugged. The counter needs to be removed from the stove. Take the downdraft vent out of the counter. Gloves are used to protect hands. When removing appliances from the counter, use the installation manual for the cooktop and downdraft vent to guide you.

  2. Remove the gear motor cover.

    Attach the mounting nuts to the channels. The gears motor cover has screws on it. Attach the gear motor wires to the gear motor cover and remove the wires from it.

  3. Remove the blower housing cover.

    Pull the blower housing cover off after removing the mounting screws.

  4. Remove the blower motor.

    Lift the blower fan wheel blade off the motor shaft with the Allen-head set screw. Pull the boot up on the motor. To make sure the screwdriver doesn't have an electrical charge, place it in a slot with an insulated handle. The wires need to be disconnected from the capacitor. The wires need to be removed from the boot. Attach the blower motor wire harness if you tilt the top of the blower housing. Put the blower housing assembly on the airbox. The wires need to be pulled through the housing. Pull the blower motor out of the motor mounting nuts.

  5. Install the new blower motor.

    Attach the new blower motor to the mounting nuts. The wires need to be Threaded through the blower housinggrommet. Attach the air box cover to the blower housing assembly by flipping it upright. Plug the blower motor wire harness if you want to tilt the blower housing assembly. The blower housing assembly needs to be lowered. The rubber boot has wires through it. The wires have to be connected. The rubber boot needs to be put back on. The flat part of the motor shaft should be aligned with the set screw on the blower wheel. Attach the set screw and position the blower wheel above the motor shaft.

  6. Reinstall the blower housing cover.

    Put the blower housing cover over the blower housing.

  7. Reinstall the gear motor cover.

    Attach the wires to the gear motor through the gear motor cover. The gear motor cover should be positioned over the gear motor. Use the mounting nuts to secure the channels.

  8. Reinstall the downdraft vent and cooktop.

    Follow the directions in the installation guide to get the downdraft vent and cooktop back in the counter.

  9. Restore power.

    The power cords for the downdraft blower need to be plugged in.

  10. Disconnect power and remove the downdraft vent from the counter.

    The downdraft vent can be unplugged. The counter needs to be removed from the stove. Take the downdraft vent out of the counter. Gloves are used to protect hands. When removing appliances from the counter, use the installation manual for the cooktop and downdraft vent to guide you.

  11. Remove the gear motor cover.

    Attach the mounting nuts to the channels. The gears motor cover has screws on it. Remove the gear motor cover and connect the wires. The gear motor cover must be removed.

  12. Remove the blower housing assembly.

    Attach the blower motor wire harness if you tilt the top of the blower housing. The blower housing assembly needs to be removed.

  13. Remove the air box cover.

    Pull off the air box cover by removing the mounting screws.

  14. Remove the gear motor.

    The gear motor mounting nuts must be removed. The gear motor bracket needs to be flip over. Don't remove the U-bolt nuts, but loosen them to release the cam. Remove the gear motor mounting screws after removing the cam.

  15. Install the new gear motor.

    Remove the mounting screws and position the new gear motor. The cam needs to be on the gear motor shaft. The side of the cam and the gear motor shaft have the same side. To secure the gear motor shaft to the side of the cam, you need to tighten the U-bolt. The gear motor bracket needs to be upright. Place the gear motor brackets in the air box.

  16. Reinstall the air box cover.

    Place the air box cover over the air box and thread the gear motor wires through it. Attach the air box cover to the air box using the mounting screws.

  17. Reinstall the blower housing assembly.

    On the air box cover, position the blower housing assembly. Attach the blower motor wire harness to the blower housing assembly.

  18. Reinstall the gear motor cover.

    Attach the wires to the gear motor through the gear motor cover. The gear motor cover should be positioned over the gear motor. Attach the channels with mounting nuts.

  19. Reinstall the downdraft vent and cooktop.

    The downdraft vent and stove are in the counter.

  20. Restore power.

    The power cords for the downdraft blower need to be plugged in.

Time required: 15 minutes.

You would need the following tools: 1/4-inch nut driver, 3/8-inch nut driver, work gloves.

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