Won't stay up unless you hold button down and won't go down unless unplug!!
My hood is a couple of years old and just started not staying up unless you hold one of the 4 speed's button's down. It will only stop and operate on speed 1 but at least it works. To put is down you must unplug it and ten plug it back in, then it goes down. If you leave it pluged in it will go up and down all by itself every so often.
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You probably will find that the vent is clogged with grease. A switch device works with the vent so the fan operates only when the vent is open and does not operate when the vent is closed. Things should get back to normal after a thorough cleaning unless the fan is defective and won't operate at all.
I had the same problem. An audible pop and the lights stopped. Fans still works, light bulb filaments appear intact. My problem was that a short piece of the copper on the printed circuit board, inside the switch housing, had vaporized as if it were a fuse. I soldered a bridge of copper wire across the small 5mm gap and all was working again. Access the switch compartment by removing the filters, undo a couple of retaining screws to remove switch unit. Make sure the electricity to the unit is Off/unplugged before proceeding!!! Switch unit cover has 4 screws holding it on. Once inside the unit, trace the wire (mine was grey colour) from the light switch to the small printed circuit board. The copper printed circuit link to the connector had gone...no sign of burning, just gooone! Solder a bridge of copper wire across the gap and reassemble switch unit to test. ....send beer donations to me in qld...cheers!!!
In my case, I pushed the button, the housing goes fully up, then right back down. I removed and disassembled the unit for cleaning. After Assembly I located two microswitches that cause the extension moror to stop at the top and at the bottom of the swing. In my case, the inertia of the motor caused the unit to "Coast" thru the top of the stroke and continue back down. I bent the outer 1/3 of the metal tabs that depress the microswitches so that the unit stopped rising a wisker sooner and no longer goes back down without pushing the button. The same coasting theroy may apply at the bottom of the stroke. The motor that runs the up and down motion is controlled by three switches, the two limit switces plus the momentary push button switch. If you don;t need to completely remove your unit for cleaning, the microswitchs can be located by removing the fan housing and looking up from inside the cabinet (under the stove) on the right side. IN my case, there was 10 years of goop to be removed.
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.
grease accumulation, remove the fours screws on the lower plate, to remove excess grease. further you can unscrew the bolt that are holding the assembly and unplug the unit. after remove fans with allen key and remove motor , clean and reassemble , make shure to put motor the right back the same way. reassemble the same way , problem should be solve for at least 7 years depending on cooking.
We installed our Broan-Allure range hood about ten years ago. On three seperate occasions since, the fan has randomly turned on and none of the control buttons would turn it off. After a while it turns itself off. During those same times, when you turned the lights on, they would blink before finally staying on. On each occasion, I have removed the screens and metal underpieces to gain access to the circut board. Once you can see the circut board, remove and replace the 3 Amp fuse that is mounted on the board. (Radio Shack part # 270-1054)...even if the fuse looks good, replace it. Each time this has work for about three years, then it acts up again..