Question about Broan-NuTone CV750 Central Vacuum

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The top motor on my Nutone CV-750 quit working

I ordered a replacement motor but when I installed it I neglected to attach the ground from the electrical board. When I turned it on to test the motors sparked. I imediately turned the vac off and connected the ground. Now when you turn on the switch nothing happens, it is like a fuse has blown. How can you test the fuse on the electrical board and where can you buy a new one if it is bad? Where can you buy the electrical board if it is bad.

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6 Suggested Answers

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Posted on Jan 02, 2017

reddevil6
  • 1673 Answers

SOURCE: Nutone CV 450

If the top comes off, it will be by the motor and exhaust. Just replace it with the new one, make sure you don't mix up any wires. Also unplug it from the AC first.

Posted on Jun 22, 2008

  • 95 Answers

SOURCE: I have a nutone CV-750,

It sounds like you could have one of two problems. I would guess either a short in your house, or a bad relay. If you plug you hose in sideways it will bypass the low voltage wire in the hose. If the unit doesn't shut on and off then you have a short and need a new hose. If the unit continues to cut on and off then you probably need a new relay. The relay is really easy to change out yourself and there are places to buy online.

Posted on Feb 13, 2009

  • 95 Answers

SOURCE: NuTone CV353 Central Vac does not start when hose is plugged into

Try to plug the hose in sideways. So the top of the hose is rotated 90 degrees. If the unit turns on then there is something wrong with the hose. It might be a short or it could be a bad switch on the handle. If the unit still wont turn on I would think that maybe the low voltage wire got disconnected from the unit or there is a break in the low voltage wire somewhere along the way. Let me know if you plugging the hose in sideways works.

Posted on Feb 22, 2009

  • 4 Answers

SOURCE: NuTone Central vac won't turn off

If the central vacuum tank will not turn OFF even with the switch in the “OFF” position, then the low-voltage wires should be disconnected from the tank. If the tank continues to run and still will not turn off, then most likely the relay inside is defective (but it could be a defective and/or shorted ON/OFF switch). If with the low-voltage wires disconnected the tank is able to then be turned off with the switch, then there is a short in the low-voltage wires or a hose is plugged into an inlet somewhere. ~ TTURAMBAR

Posted on Mar 27, 2009

Sparchitech
  • 5 Answers

SOURCE: Nutone CV-750 stops during use

This was one of Broan/Nu-Tone's beginning attempts at lower-decibel machines. Like so many of their competitors, they choked the motors in dense foam in the head unit and made it too difficult for them to cool. Make sure that you're not blocking or suffocating the ventilation, but don't be surprised... a plethora of makes and models like this one have had to be pulled and discontinued because of the overuse of muffling foam snuffing out good machines before their time.

Chalk it up to a design flaw and start yanking that foam out. The specs on this puppy make it far too good a machine to pass on just becuase of the manufacturer used you as a beta test before they should have relaeased it from proto. If the increase noise irritates you, read up on sound waves, frequencies and subsonics and get creative in how you isolate the parts that bother you. Chances are, though, you'll be just fine.

Lastly, if you can tell me the age of the machine and get me the numbers off the motors I'd love to know more about this situation you're in. You're running dual 2-stage bypass 12.5 amp motors. That puts you roughly in range of a Lamb 472, one of our industry's most hardy motors. If THOSE are what you're running and they're over-heating, you've got a firehazard in your vac that *somebody* never should have put certification on for marketing.

Posted on Jul 12, 2009

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