Question about Broan-NuTone CV450 Central Bagged Central System Vacuum

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Nutone CV 450

How to replace relay board assembly on a Nutone CV 450? Any helpful advice (like where to find it inside) would be appreciated. I was sent a new relay by Nutone to solve the problem of the vacuum not shutting off.
Greg

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  • Greg Napier Jun 24, 2008

    Replaced the two original relays with the new one on a circuit board that does the function of two. Wired everything up according to the diagram. Vacuum still won't shut itself off (I have to unplug it). Any suggestions out there? Can I trouble shoot the sensors some how?



    Napes1

  • Anonymous Apr 30, 2009

    my vacunm will not shut off

  • Anonymous Mar 19, 2014

    does the VX550CC Nutone have an airflow sensor? The motor has been replaced but now cycles on and off quickly when vacuum is used on floor, runs well and for hours when not being used.

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2 Answers

Repace motor relay board inside unit cost $39.36 from nutone $6.95 shiping. The relay board turns the unit on and off.

Posted on Oct 01, 2008

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  • Master
  • 1,673 Answers

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

  • Lauren Junge
    Lauren Junge Jun 25, 2008

    There should be a auto/manual switch, at least most have them, is it in the manual setting? If it is in the auto setting, then pull out the the 2 low voltage wires, if it shuts off, then there has to wires touching in one of the outlets or a staple thru the wire shorting the 2 together. If it stays on, then there is a problem in the cannister. Check that switch, maybe it is stuck in the manual position.

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1 Answer

Nutone CV353 does not shut off, think it is the relay board


You probably have a stuck relay. You can try tapping with medium force next to where the low voltage wires are attached to the unit using the handle end of a hammer. Even if this works it's time to replace the circuit board. Take the unit to a local vacuum repair center for service.

Jun 26, 2010 | Broan-NuTone CV353 Central Vacuum

1 Answer

Nutone Scovill 350 will only turn off if unplugged


Some units have an on/off switch on the power unit itself. Check to make sure that is not turned on. Unplug your power unit and remove the 2 low voltage wires (not the power cord itself) . The low voltage wires start at the unit and run throught your home and attach to each hose inlet. They are usually attached to the unit by simple wire terminals or wire capped to small wires coming out. Just unlug the terminals or unscrew the wire caps and pull the connections apart. Plug your machine back in. If it still comes on the problem is the relay or circuit board/switch/ relay assembly inside the unit. If it doesn't come on with the low voltage wires unattached then you may have two wires touching somewhere in the low voltage wiring.

May 14, 2010 | Broan-NuTone CV353 Central Vacuum

1 Answer

A Nutone CV-450 System with inlet nozzle switch issues


You are suffering a connection problem of the hose end fitting to the wall outlet. Either the hose is not aligned with the two pins in the wall outlet, or the pins in the outlet are dirty and not making good connection to the hose end fittting.

Jan 01, 2010 | Broan-NuTone CV450 Central Bagged Central...

1 Answer

Have a nutone CV-450. Suction is gone at the


The first thing to do is to disconnect the pipe coming into the unit. If there is suction there than you probably have a break in the line. If there is no suction when you disconnect the pipe coming into the unit than it is most likely the motor gasket. This gasket can sometimes get sucked into the motor causing problems. Remove the lid to the central vacuum, than disconnect the motor, you should be able to tell if maybe the gasket has been off center or if it has been sucked up in the motor.

Dec 13, 2009 | Broan-NuTone CV450 Central Bagged Central...

1 Answer

CV 570 Relay not working, need a replacement. OMRON G7L-1A-TUBJ-C


There' s not much you can do if the relay goes. You just have to replace it. Are you positive that it is the relay?

Nov 30, 2009 | Broan-NuTone CV570 Central Bagless Central...

2 Answers

I need a relay board for a Nutone CV 450 12.6 amp dual motor vacumn unit. Where can I locate one? Part #??? Unit will run by itself, then shut off. Unit wll not run at all. It has a mind of its own....


Unfortunately I don't have a part number for you, but you can call this number 1800.322.2965. Tell them you need a new relay board for your system and they'll be able to help you. They cost around 99$. for anything else you might need, go to www.thinkvacuums.com

Sep 01, 2009 | Broan-NuTone CV450 Central Bagged Central...

1 Answer

I have a nutone CV-750, and when I am using it, it will shut off and on.. What can I do?


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.

Jan 06, 2009 | Broan-NuTone CV353 Central Vacuum

1 Answer

Nutone CV 450


if your unit normally turns on when you open the flap on the wall inlets then you should check each inlet for a switch or a button, sometimes those buttons can get loose and fall into the wall making the unit stay on.

Jun 23, 2008 | Broan-NuTone CV450 Central Bagged Central...

2 Answers

I have a 3 year old NuTone CV 353W central vac system and recently the switch on the hose handle does not turn the system on from any outlet in the house. I have to plug the hose into the outlet and then...


http://geeksquad.fixya.com/ThreadView.aspx?prdid=0&thid=567634
Generic problem for all Vacuums
I have a 3 year
posted by patfitz on May 03, 2008
I have a 3 year old NuTone CV 353W central vac system and recently the switch on the hose handle does not turn the system on from any outlet in the house. I have to plug the hose into the outlet and then turn the unit on from the switch on the canister. Any help would be greatly appreciated. Thanks

Hello,
I would advise you to ALWAYS to FIRST UNPLUG YOUR VACUUM before beginning any service procedure. There are a couple of things that come to mind, 1st. you may have a bad switch in the hose and in most cases that can be repaired – if not you would have to purchase a new vacuum hose. 2nd. You may have a bad inlet valve in your hose and most of them are low volt of which would only cost less than $10.00 and can be replaced yourself unless you have what they call a SuperValve of which has 2 low volt wires and then it is wired to your home electricity and that should be replaced by an licensed electrician. It is a low volt and high volt inlet.

#3. the last thing you may check id that you may have a bad relay in the canister itself. Because you should be able to turn on the Central Vac with the switch on the hose and everything should work just fine . feel free to contact your local vacuum cleaner dealer in your area of call the Nutone Factory cust serv line for further assistance. So if you need further assistance, please feel free to contact your local vacuum cleaner dealer in your area or in the yellow pages, or contact the factory phone number or website to further assist you with your questions.
http://nutone.com/ Customer Service
Nutone Inc.
9825 Kenwood Road
Suite #301
Cincinnati, OH 45242
Customer Service 1-888-336-3948
Technical Support 1-888-336-6151
Thanks, Don the Vac Man
Go Ahead. Use Us.

May 03, 2008 | Broan-NuTone CV450 Central Bagged Central...

1 Answer

Low voltage wiring


Probably just didn't wire the l/v side of the relay properly. Or forgot to plug the leads from the outlets back in to the vac after you got it all hooked back up. Folks do it to me all the time and then make like it's my fault! Ha ha.

Jump the l/v contacts inside the CV. If it goes: trace outward toward the outlets to see if something shook loose while it was apart. If you can't jump the l/v with a plier/screwdriver at the CV or even inside it, you have an issue on the board (either how you've connected to it or it's defective itself). The prob is that there's dozens of diff board configs, plus the relays and transformers weren't together on the same board in the old days. If you've got one of these models with a massive transformer separate from the relays get out the test leads and make sure you've got adequate voltage coming out of her to power the relay coil.

Aug 26, 2007 | Broan-NuTone CV750 Central Vacuum

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