Question about M&S Systems ZX7000 Bagged Central System Vacuum

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I have a 10 year old AirVac central vacuum system that has worked until this morning. As I was using it this morning, and turned it off for about five minutes it would not start again. The tank in the garage (that accepts the dust) sounds like it is just huming not working. What is wrong?

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Sounds like the motor finally siezed on you. Motor is trying to turn but won't thus the hum. Do not allow the vacuum to stay on like this as it may cause a fire. Requires a motor replacement.

Posted on Nov 23, 2008

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Vacuum has good suction but will not turn off at the handle or when disconnected from the fitting on the wall


Disconnect the low voltage wires going to the vacuum. If the vacuum stays on you have a bad relay. If the vacuum turns off you have a short in the wire somewhere. The bad news is the relays are not available, however there are some companies that sell external relay control boxes that will bypass your units bad relay.

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Hi! My central vacuum has worked perfectly until just a couple months ago. I went to plug the vacuum in and it didn't automatically start the suction. When I clicked the switch to the right on the...


It sounds like you may have a bad hose. Plug the hose into the wall but rotate it 90 degrees from the normal position. This will bypass the switch on the hose. If you look at the wall end of your hose, you will see a metal band around it. That metal band is split into two sections. You are trying to plug in the hose so that the separation of the two pieces of metal is not lining up at the top of your inlet. If your vacuum turns on then you have a bad hose. It is possible that you have a bad switch in the hose, but it is more likely that you have a bad hose.

If your vacuum does not turn on, then you may have a break in your low voltage wire somewhere. You can check to make sure it didn't get disconnected at the unit. If the wire is connected then try to cross the low voltage wire from the relay at the unit with a small screw driver. If the unit does not turn on you have a bad relay.

If it is the relay, AirVac does not provide them. You would need to consider buying a new unit.

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No suction from wall outlet. Power to powerhead. Breaker has not been tripped. Manual mode works on cannister in garage. AirVac VM458.


I had the same exact problem and it took about 4 months to find out the problem. I had a paper clip stuck to one of the orifice in the hall way of my house and that is what I had experienced. The other thing is to check the entire tube system because maybe a mouse or rat has chewed into it. It has all to do with the electrical wire throughout the system. Good Luck

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1 Answer

I just inherited an AirVac AV400. It won't turn on. What do I try? GrampaBigJohn


there is a reset button on it some where near the power switch so I would look for it as it most likely is that simple. good luck!

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Yes you can easily test for a clog, and a crack for that matter.

to test for a clog push a dry garden hose through the entire system until it comes out at the other end.

to test for a crack, Disconnect the pipe that comes from the house to the central vac unit. Turn on the unit and put your hand over the opening directly at the central vac unit.(Using the utility inlet at the unit will not accomplish the same thing.)
  • Step 2 If your suction is good, then reconnect the tubing and turn on the switch at the unit. If there is no switch, plug your central vacuum hose into one of your inlets to start the system. Then have someone completely seal the hose with their hand. While the unit is running go to the exhaust. With everything closed you should feel almost nothing coming from the exhaust. If you feel very little exhaust, then you do not have a leak
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    1 Answer

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    There is a relay board inside your unit which is most likely bad. If you have the make and model, you can contact me and I can order the board for you(pending your mechanical abilities). If not, contact your local central vacuum installation company. www.thevacdudes.com

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    The only thing you can use really is a plumbers snake.
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    Rob in the UK

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    You can use a Tornado Cloth to clean out your central vacuum piping. Its the simplest and most cost-effective maintenance routine you can do.

    You can purchase them from here

    http://www.thinkvacuums.com/new.htm#Maintenance

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    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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    It is possible that the low voltage wiring that controls your central vacuum has been damaged during the cable work. You can check to see if the low voltage relay is working by shorting the two terminals together at the unit. Just disconnect the two small (18-22 gauge) wires from the unit and short across the terminals where the wires connect. If the unit comes on, the vacuum is fine, and it is most likely the low voltage control wires that have been damaged. It should be a pretty easy fix, if you can get to where the wires are located. They are probably just pulled apart at a joint. Good Luck!!

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