I HAVE A BRAUN NuTone downdraft Eclipse Blower that just goes up and down - does not stay in the up position.

Question edited for clarity. This appears to Broan rather than Braun. Added full model name.

This answer on Fixya hints that the original boards were faulty. I thought he was from Broan, but it sounds like he is a repairer.

https://www.fixya.com/support/t668741-braun_qs3_range_hood

No instructions online, but the board is available

https://www.google.com/search?q=broan+qs3+controller+disassembly

Broan Nutone Allure III Range Hood Switch Control Board

Build.ca https://www.build.ca > part > R111653-Broan-Nutone-...
Broan Nutone R111653 Switch Control Board. Main Control board switch assembly. Use with QS3 Alllure III Range hood. Product Specifications ...
$237.89
Missing: Braun ‎' Must include: Braun

Broan QS3 Allure III Range Hood Parts

Store for Parts https://www.storeforparts.com > Broan > QS3
Part Key Part Number Unit Price 0 SV02544 SV02544?LED 1 SR740013 View 69 more rows
Missing: Braun ‎' Must include: Braun

REPLACEMENT PARTS GUIDE

img-b.com https://s1.img-b.com > product_parts > broan PDF Attachment Screws #8-18 x ¼" Type AB or B, 1-Suction Cup. (Rubber Bulb Removal Tool), and 3-Wire Nuts. QS3. Allure III Hood. 97010792 Damper 7" Round -.

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In the front, right behind the stainless steel section put your hand there. You will feel a plastic tab. Gently pull it up. There are 2 of the filters - one on each side, each tab is located roughly 4-6 inches from the edge.

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.

Broan model 2736A won't stay up

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.

My Nutone Model 765HL uses the same heater; I tried the Broan-Nutone website but they were out of stock. Finally found it at Central Vacuum Stores for $35. Here's the direct link: http://www.centralvacuumstores.com/nutone/Broan-Nutone-Heater-Elements/QTXN-Series.php
Hope this helps!

Buy a tube of Household Goop, and put some on the front and back of the hole the motor shaft goes through and glue the wheel in place. Make a little 'pile' or filet around the shaft/wheel joint. Let it dry a couple of hours.Goop is extremely handy, sticks like glue should, stays flexible, is cheap, etc.

Hi schmidt_rich,

I'm Harvey the Master Plumber.

Your question is: You took over as owner builder when your builder "took the $ and ran". You are installing kitchen cabs now and discovered the PVC vent pipe (which goes into the foundation and out the side of the house) is in the wrong place for the location of the downdraft unit and integral blower. The vent is actually under the electrical connection panel. You were told initially( 2 yrs ago when you bought the downdraft cook'n'vent) there could be no bends in the exhaust fan route or it would change the effectiveness. Does anyone know if it is ok to put a bend in the connection to the vent? Or do you need to redo your kitchen cabinets?

I can syphathise. I have had to deal with this same problem. I have found that one ell will not degrade the effectiveness enough to notice. If you need more then you may need to adjust cabinets.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey your Master Plumber

place the push nut below the blower wheel. Don't bother with the top. The centripetal force tends to push the wheel down. The push nut in this position will prevent this.

http://www.searspartsdirect.com/partsdirect/getSubComp.pd?diagramPageId=00001&componentDescription=&documentId=P0802011&modelNumber=233.5994690&productCategoryId=0122400&brandId=0582&modelName=DOWNDRAFT-BLOWER&backToLink=&searchTerm=

Does any body know where I can get the schematic for the PC Board P/N 959-0138-003 by ACT, Inc.?

Thank you.