Every time I hit the button to raise the downdraft it goes up then immediately goes back down. It used to do this sporadically; I would have to hit the button several times, or physically hold up the hood when it raised in order to get it to stay up. Now it never stays up.
On my kenmore elite downdraft model number 233.59946090 the same thing was happening to me. my unit would go up and down automatically, sometimes 5 or 6 times in a row.
the problem was the top button that activates the up and down motion was too close to the switch underneath it. the fix is to remove the 2 screws on the side with the vent speed control. under that you will see 2 more screws that hold the entire switch assembly on. loosen these screws and move down, this will lower the switch so it is not hitting the underside of the button to hard and mistakenly cycling the switch on and off.
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While I don't have a schematic, there is not much to the system. In my case, I removed the entire unit (stationary and mobile parts) and cleaned all the grease out. Be prepared to do this outside on a picnic table with a paint scraper and grease bucket.
Our unit would raise ok, then go right back down. There is a cam that raises the unit up and down. That same cam impacts a couple of micro switches. The push button switch over comes the raise limit switch when it's time to go back down. The limit switches (one up one down) have small metal tabs that get disturbed by grease and increased weight of the grease. After cleaning, just bend the upper limit tab just a little so it is tighter. On my mine, the unit would lift, then coast over the top of the cam profile and go back down. By bending the metal tab connected to the raise limit switch so the switch was more fully engaged sooner (earlier) to the top of stroke, the unit will stop where it should. Pressing the button again by passes the raise limit switch so the cam continues and the unit goes back down. I wish I had taken pictures when I did this. It really is very simple.
Gail was spot on. That worked for me until the unit would go up and/or down on its own. The problem was traced to the double microswitch called the 'Lower Switch Bracket Assembly' ($24. thru Lowes ). To replace these switches is not for the faint of heart as it is deep within the assembly. A good weekend mechanic can look at the exploded parts diagram and see what / where. Found grease residue on- and slightly within- the microswitchs due to Broan not properly design shielding and protecting these critical switches from grease. Did not find any ghosts, however.
The crank arm which raises and lowers the hood has jammed most likely against the vertical bearing guide in the center of the box. Fix is: a. If the hood is up, support it somehow so it doesn't crash down. Unplug the whole unit. b. Pull off the box covering the motor and electricals. c. Pull off the motor/gearbox assembly. Careful here, as this will release the crank arm which may still be under some load, causing the gearbox assembly to rotate on you. d. Bend everything back into shape. e. You may need a new crank arm or gearbox if the shaft to the crank arm is bent. f. Reassemble. This is most easiy done if the hood is held up by someone or something.
Folks, I have experienced the same problem several times - in all of my cases the problem was solved by simply opening the back panel and taking out the motor assembly and re-aligning it. Check out this URL for a blow up of what's inside and parts list - http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5130126
The problem is that the arm tends to slip out and therefore won't raise or lower the hood anymore. Be careful when aligning it can be a little tricky - carefully observe the how the motor works outside of the housing via the switch and you will get the idea.
The filters need to be seated properly to complete an electrical safety circuit. This keeps the unit from operating without the filters. The best way I have found to fix them when they get dislodged in the closed position is by using two spatulas. The first is used to move the filter forward a bit and the second is used to keep it pushed tightly forward to complete the circuit.
check your bottom limit switch - i'm guessing its bad. the unit doesn't stop operating til it trips a (working) limit switch, if the switch is bad it'll cyle right past it and go back up until it hits the top limit switch (again).
mine just did this this morning..a few months ago the button to make it pop up stopped woring so i just started using the wires to operate it...this morning it got stuck uo...i took off the electrical cover and found a burnmark on my circut board...it seems a diode fried or something...im still looking for a replacement
replace whole unit thats roughly what the whole unit costs 157.00 just a little secret there they dont tell you cause they mark up the prices i worked for the company that sold and installed this equipment you also remember tax
I have the same problem. Seems to be pretty common that the motor that raises the unit goes bad. Ours is 2 1/2 years old and has not seen that much use....that motor should not have failed that soon...and this is a high end product!!! I have been quoted $289 for a replacement motor and $150 for labor!! So, $450 bucks....gads. The unit, new, cost about $900, as I recall.