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Dacor Downdraft Vent not Raising

Model #RV46W, this vent which is designed to be mounted behind a cook top sounded like it was trying to raise, but would simply sit there and not move. Each time the button was pressed, a humming noise could be heard from the area of the lift motor but again, the vent wouldn’t raise. Without the vent, cooking odors were not being removed from the kitchen so it was time to get it working.

These downdraft vents have great benefits when cook tops are mounted in kitchen islands, or in areas that a wall mounted vent would not fit. Using large fans to draw air through the vent filters, they do very well at pulling smoke and steam away from the cooking surfaces to the outside.

Many of these vents can be difficult to service, simply because of their location and the associated venting and wiring involved. The vents use a lift motor which is geared to slowly lift the top half of the vent for use, then lower it back flush with the cook top. The motor assembly also has an upper and lower limit switch which when actuated tells the control board the position of the vent top or periscope portion of the vent. The final component is the control buttons on top which are used to activate the motor, and control the speed of the blower motor.

The easy part of this vent to get to was the control board so I started my investigation there. When the up/down button was pressed, noise from the motor could be heard which could indicate a broken motor gear case, but at least I knew current was flowing. I would normally go after the motor, but the ducting on this unit required significant dissasembly to get to. With the board cover removed, I used my meter to verify voltage to the motor, but when the button was pressed, I only had 60 volts AC going to the motor. Enough so it made noise, but not enough to get it to lift the heavy vent periscope.

While in the area, I removed power and checked the resistance of the motor which seemed OK. Further investigation of the board showed some significant heat damage around a couple components so with that and the low voltage, I determined this board was no longer functioning properly. I installed a new control boardicon in its place, paying close attention to the correct wire placement of each connector. Once mounted, I pressed the button and this time the periscope raised along with the normal motor noise.

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