Thanks for the help. I found it myself and replaced the two old relays with a new one that combined the two motor relays to one. It didn't fix the problem, however. The vacuum still runs when all the hose outlets are closed. Any suggestions?
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Re: 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.
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It depends on the age and condition of the rest of the vacuum and accessories. Check out the hose and power nozzle especially. If these look well worn, replace the unit. If it's a no more than years old, I'd simply replace the motor. Again, it depends on the condition, or expected "life" of the other components.
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.
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.
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
Checked and found that motor is definitely overheating for unknown reason. Since power unit is still under warranty, solution was to contact local service company for NuTone power unit and have them come out and fix/replace it free of charge.
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, OH45242 Customer Service1-888-336-3948 Technical Support1-888-336-6151 Thanks, Don the Vac Man Go Ahead. Use Us.
Mine is the same, and it is the relay welding itself closed. The relay is switched by the low-voltage wiring that connects to the vacuum outlets, and it switches the motor on and off. Mine was welded in the energized position. I have cleaned and filed the contacts on the relay, and that solved the problem for about a week. I suspect the relay contacts were plated, or a worn motor is drawing a little too much current (it is several decades old at this point).