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Poor suction I have weak suction at all ports and no suction at the canister. It is a Nutone model CV-350. This unit came with the purchase of our home, so we don't know much about it. thank you for your help.

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  • Anonymous Apr 25, 2008

    I have the same problem. I recently purchased a home with nutone cv350N and now the suction os weak. Were you able to fix your problem?

  • JENN41976 Feb 26, 2009

    I HAVE THE SAME EXACT VACUUM AND I HAVE CLEANED THE FILTERS AND STILL POOR SUCTIONING

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Either you have clogged filters, or the motor is weak, you could check the carbon brushes, otherwise replace the motor.

Posted on Mar 29, 2008

  • Lauren Junge
    Lauren Junge Mar 29, 2008

    Also check the main piping that is hooked up to the unit, maybe it isn't all of the way on.

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2 Answers

Central vac not sucking


Check for a plugged tube in the wall by listening to the motor when it's running. If it sounds like it's running too fast then there's an obstruction. If it sounds ok, then there's a disconnected tube somewhere in the system.

Sep 11, 2014 | Broan-NuTone CV353 Central Vacuum

Tip

How to diagnose a clog in your Central Vac and how to remove it


Symptoms of a clog
Low Suction/No Suction
No suction at Inlet

Tools required
Wet/Dry Vac or vacuum with decent suction and a hose
Phillips Head Screw Driver
Metal Coat hanger (straightened out)
Flashlight

First things, first, make sure your canister is empty at the unit. I know, most people would have already checked this but I have been to a lot of client's homes and this was the issue. They were full or almost full. So just check it before you go to do anymore diagnosing. I suggest emptying it anyways, this way you can see what you clogged in your unit

Now if your machine has a utility valve on the unit turn on the manual over ride switch on and lift the utility valve and if you have suction your machine is fine, you have a clog. If you have no suction or poor suction
-Canister not attached properly
-Filter clogged
-There is a disconnect of pipe within your walls (I've seen it and it renders your system useless and is going to be expensive to repair the system)
-Your motor is going in your system (Your vacuum should sound like grinding metal and chances are it's throwing sparks and smells of burning electrical, turn the unit off immediately and unplug power cord) Your unit will need a new motor or you will need to replaced the whole unit. Sometimes can be cheaper to replace the unit.

So now back on track here, we are going to say the vacuum has great suction and is running smoothly.

Check your hose for clogs, easiest ways are to plug the hose into the utility valve and turn on the machine manually at the switch.
If you do not have a utility valve on your unit (this is where the other vacuum comes into play) plug your central vacuum hose on the end of the shop vac hose. Most hoses are standard and slip right on over the end of a shop vac's hose end (1 1/4 inch end). Turn on your shop vac and feel the suction at the end. It may not be as powerful as your CV but it should be comparable.

If the hose checks out to be free and clear we have a clogged system.

Now lets move to the inlets throwout your home, first we are going to plug our hose into the inlet that is nearest to the unit. If there is little or no suction we know there is an issue either in the distance between the nearest inlet or there is an open/broken valve.

Open/Broken valve (CV will not provide optimum suction with a open/broken valve)
-Plug the hose in and activate unit
-Check all inlets for proper seal, you will hear an annoying whistle or you will hear a gust of air from an improper inlet door closure. (Do this as quick as possible, if it is a clog you are putting strain on your motor, but if you vacuum on a regular basis chances are you know if there are whistling noises or missing pieces of an inlet. If you are missing an inlet door, replace the inlet. If all is checked out to be good, lets go back to unclogging again.

If there is suction at this inlet you know there is no clog between this inlet in the unit, try all inlets from nearest to farthest away. If you try your next inlet and have weak to no suction you found your point of a clog. This is where you will start to unclog your unit.

Take the hose end of your shop vac and insert it into your inlet. Turn the shop vac on and remove the hose quickly to create a seal and lose a seal. You should start to hear items moving through the line.

Now take your CV hose and insert it into this inlet, activate your CV and check suction if there is more suction, your slowly making progress.

Take a flashlight and look into the inlet to see if you can now see the obstruction. If you can, get your coat hanger out and go fishing. It may be easier to remove the inlet from the wall. Your basic valve is safe to remove. If you have a supervalve, do not remove, there is high current installed in the upper portion of the inlet for your power nozzle.

Repeat the Shop Vac suction and stop and the CV suction and stop until you clear your items.

This is going to take a few minutes of tugging between two vacuums. Eventually it will free if it went in, it has to come out. At the end of the day your basically playing tug of war between your Shop Vac and CV. But if all goes to plan, the clog will end up in your shop vac or in your CV unit.

Good Luck!

on May 13, 2014 | Vacuums

1 Answer

I have weak suction in all ports and also the port on the unit itself (for the garage hose). I just removed the filter and it does not appear to be all that dirty. Trying to figure out how to clean it to...


The CV450 has two motors in it. I would guess that either one of the motors has gone bad or one of the motors is off it's gasket within the unit. Overtime the gaskets can wear and the motor looses it's seal. It is not uncommon for a motor in one of these system to fail after about 8-10 years.

Aug 10, 2011 | Broan-NuTone CV450 Central Bagged Central...

1 Answer

The motor on our Nytone CV-350 is shot. Should I buy a new motor or replace the unit?


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.

Jan 24, 2011 | Broan-NuTone CV-350 Central (Kit) Vacuum

1 Answer

CV-353 will only go off by unplugging. Electrical disconnected from ports to unit. Checked push pins on all ports and they are moving in and out.


http://www.centralvacuumstores.com/cvs/trouble_help.php#runs_continuously

Here is a link to find a local dealer:
http://dealer.nutone.com/DealerLocator.aspx?unit_id=002&cata_id=8

Dec 23, 2009 | Broan-NuTone CV353 Central Vacuum

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...

2 Answers

Nutone central vacuum leaks brown liquid


Dear lord, that is the most absurd thing I've ever heard. Who installed the Vac and DW or were they both in the home before your time?

Normally, if liquid drips out of a CV outlet it's because it was sucked up during vacuuming. However, if your vacuum runs or has suction at the outlets due to the dishwasher running, you have a low voltage gap being bridged by either the dishwasher's wiring or by liquid leaking from it onto the CV wiring somewhere.

Bottom line, you have MAJOR issues inside your home with one or both of the systems, and if there's liquid, there's a dishwasher to be worried about! Look below it for leaks into the basement/lower floor; follow the plumbing (especially the drain waste runs) and figure out where the damage is before your house suffers the lot.

Jul 12, 2009 | Broan-NuTone Vacuums

2 Answers

Decreased suction


you might have a clog, to try and unclog the lines, you need to unplug the unit, and remove the bag compartment. Then take a shop vac using the hose attachment hold it into the attachment door where there is low suction and try to draw the clog out the way it went in.

May 09, 2009 | Broan-NuTone CV353 Central Vacuum

1 Answer

My NuTone built in central vacuum is putting dirt out instead of picking it up. We have just changed the bag.


From the information here, it sounds like you do not have any suction. If this happened at the same time you replaced the bag, I'm guessing that the unit did not seal when you put it back together. Make sure the bag is seated like it should be and the cover that you removed to replace the bag is sealed and locked into place. An easy way to check this would be to remove the inlet side tubing from the machine and check the suction there. If the unit has a utility valve, be sure that it is closed. You should have good suction there unless the bag cover part of the canister is not sealing onto the rest of the unit, or the fan assembly is damaged. The latter of which is pretty rare, and it would probably make a good bit of noise. If you have good suction at the unit, then you either have a clog or an open pipe somewhere. I hope this helps. Please comment with more details if it doesn't. Good Luck!

Dec 23, 2008 | Broan-NuTone CV350 Performance Bagged...

1 Answer

Nutone 353 central vacuum....all of a sudden, poor suction at all house outlets.. Checked hoses and pipes for obstruction...none found


I think this unit has a utility valve on the front. If so, do you have good suction at this valve? If not, disconnect the inlet piping and check the suction directly from the inlet. Make sure the utility valve is closed while checking the suction on the inlet. If you have good suction, you have an open pipe or valve somewhere in the house. If you have any vacpans, check these first. Next, turn the unit on and walk through the house and listen for air whistling. If you do not have good suction from the inlet at the unit with the utility valve closed, replace your bag and look for a secondary filter that may be plugged. Good Luck!

Nov 26, 2008 | Broan-NuTone CV353 Central Vacuum

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