Question about Broan-NuTone CV450 Central Bagged Central System Vacuum

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There's little or no suction on my central vac so I think maybe something is stuck in the piping. how can I troubleshoot and/or fix this?

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First, check the hose, wands, and power nozzle. You can check the hose by dropping a coin in one end, then lifting the length of the hose until the coin drops at. If it doesn't, then there's an obstruction in the hose that needs cleared. Depending on where th blockage is, it can be difficult to remove. The best way is to connect the wrong end of the hose directly to the in port of the vacuum and turn on. This presents an opposing suction to the clog and should clear it.
To check the powerhead, drop a coin in the wand end and allow it to drop through. If it gets stuck, there's a clog, probably in or near the elbow. Use a blunt object to gently push it through. You can visually check the wands.
If the filter is dirty, it presents an obstruction to the airflow, and will result in a loss of suction. Rinse and dry thoroughly. I recommend keeping an extra filter on hand and alternate use.
Check all outlets by plugging hose into them and turning machine on. Check for differences in airflow. If there's less suction in one than the other/s, then there's a blockage in that section of pipe, probably at one of the elbow. The obvious place would be the elbow at the outlet. Visually check for clogs.
If all the outlets have a low airflow, my first guess would be the filter in the vacuum, but there could be a clog in the main piping.
Another cause could be leaks in the hose, most likely at the ends where the hose connects to the connector or handle. The hose generally needs replaced if this is the case.
The fan system may be bad, resulting in reduced suction. It will need to be replaced if this is the case.
Depending on the age of the vacuum, the motor could simply be wearing out.
The best diagnosis can be provided by a reputable vacuum repair shop. Take the entire vacuum in for trouble-shooting if none of the above helped.

Posted on Jan 03, 2011

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If you did put it together as it should, the only thing I can think of, is something got stuck in the pipe. Check this.
Old vacuums you could put the hose and or pipe to the other end of the vacuum, to blow it out. Now you have to be a little inventive to check a blockage.

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Your answer will vary depending where the power loss is felt; most likely something clogged in the hose or one of the inlet pipes.
Help me out with more info and i'll do my best to lead you to a quick resolution.

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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.

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How to unclog a central vacuum system

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The reset is not the problem. If you have suction at the vac itself , but no elsewhere., you have blockage in your main line, or your hose. Try dropping a coin thru the handle of the hose and shake it all the way thru the other end. If your hose is clear the obstruction is in your piping. If your hose is clogged you must back out the blockage by sucking it back thru the handle.
Go to each inlet with a coin and touch the contacts inside the throat of the inlet...., 2 little brass spring loaded pins. If you can feel suction move on one inlet at a time. If you have no suction at any inlet your blockage is in the main line. If you have suction at some inlets , your blockage is in a branch. Try to pinpoint the closest inlet to the vac where you have no suction. Then put another vac like a shop vac up to the inlet and **** the blockage back out if possible. ..What wedges in must back out the way it went in. Post back with more info if this doesn't work

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1 Answer

Low suction


1) Have you checked the filter? If it is clogged your suction will be low. Also, you could have a pipe loose where you can't see. Make sure that you can get a coin to go all the way through the hose. make sure the suction motor ( the unit ) is coming on.

2) Call the repair man.

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1 Answer

De clogging pipes


You can try these as long as you have some airflow. http://builtinvacuum.com/tornado-power/ If you have no suction or airflow from one particular inlet, you can reverse the main unit by hooking the inlet piping to the exhaust of the unit. Tape all other inlets closed, and turn the unit on. This should blow the clog out through the inlet door. (be prepared for a some mess with newspaper or something else to protect your floor in front of the inlet) If you still can't unclog it, borrow a portable canister vacuum or a shop vac and try to **** the clog from the inlet while you blow from the other end with your central unit. Good Luck!!

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1 Answer

No suction on lower level


http://www.geeksquad.fixya.com/ThreadView.aspx?prdid=0&thid=539794
Generic problem for all Vacuums
No suction on lower level
Posted by phil55555 on Apr 23, 2008
Nutone central vac
no suction on lower level second floor fine
ran fish tape but it does not go all the way through,
do i need to take pipe out.

Hello,
I would advise you to ALWAYS to FIRST UNPLUG YOUR VACUUM before beginning any service procedure.
Not @ first, try to get a central vacuum cuff and go to each and every inlet / outlet down the basement and put the cuff in the inlet – the central vac should come on and possibly might unclog the pipe, 2nd, try taking another canister type vacuum while the central vac is running and open the inlet door and try to “pull apart the clog in the pipe” – this does work upon occasion if not you can try a plumbers snake – but be careful because the walls of the pvc pipe are thin wall and you don’t want to poke a hole in the pipe or other wise you will have to replace the pipe. The absolute last resort should be to replace the pipe if all other do not work. Feel free to contact your local vacuum dealer in your area or in the yellow pages , or contact the factory @ the phone #’s listed below:
http://nutone.com --- Customer Service
NuTone Inc.
9825 Kenwood Road Suite 301
Cincinnati, OH 45242
In U.S.A. call:
1-888-336-3948 for Customer Service
1-888-336-6151 for Technical Support

In Canada call: 1-888-882-7626

Thanks, Don – The Vac Man
Go Ahead. Use Us.

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1 Answer

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Usually when there is no suction, and the main unit is running, then either the hose or somewhere in the piping there is a clog. If you move the hose to another location, is there suction? If not then the hose is clogged. You can unhook the pipe at the unit, flip the switch to manual, if it comes on and there is suction there, then there is a clog in the piping, If in the piping, tear up small strips of paper and mark them by number and insert one in each inlet, run the unit on manual to suck them up, and which ever numbered strip isn't there in the bucket, then that is the inlet that is clogged.

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