Question about M&S Systems ZX-6000 Bagged Central System Vacuum

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Will not cut off unless unpluged

Model AV425A -17 years old . I have checked the connections at all wall inlets ,none were loose. Next I disconnected the wall inlet wires from the unit and it still would not cut off .Help!-or name of nearest dealer. Zip 23833 Thanks

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  • 26 Answers

You probably have a stuck relay or wires are touching. Pull the low voltage wires off the vacuum, if it keeps running it's the 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. Check these guys out:

http://www.vacuumsystems.net/



Posted on Jul 07, 2010

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Your description would suggest either loose wire or a short in the switch. Take the unit apart and check to see that battery terminals are tightly connected.

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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.

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You main low voltage line from the vac to the house is likely disconnected. Start by looking at the connection where the small wires enter the vac. Touch across those two wire terminals with a screwdriver or needle nose pliers and the vac should start.If it does, inside the home those same wires run along your pie to each inlet. Somewhere along the pipe path the wires have been disconnected or broken.. Think back to any area where work has been performed or face plates removed for painting, etc. Remove each inlet one at a time and look for a loose connection on the screw terminal at the back of the inlets. When reinstalling be certain each wire is tidy and connected to only one screw terminal at the back of the inlet. Once all inlets are connected in line you will have a complete circuit back to the vac. Post back with results

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If the switches on the hose will not turn off the vac you have a short in the wiring of the vac pipe system or a defective relay on the circuit board. Plug the vac in again without the hose and disconnect the thin low voltage wiring were it plugs into or screws onto the vac.
If the vac continues to run once disconnected from the low voltage circuit you have a defective relay in the vac itself. Some are circuit board mounted , others freestanding. To avoid a service call you can take the tank off the wall and take it to a pro shop or remove the top hosing if you are confident and check out the relay for a replacement part.
If the vac stops your issue is in the house. Has any painting been done or any inlets removed lately.. check that area first for a short at the inlet. Go back to any and all inlets and remove them one at a time checking the mounting screws and backing plates for loose wiring which is touching either the metal inner wall plate in the wall or a common screw . Test the vac as you go.
If this does not help, you will need to examine the wiring in the house , running along the pipe. Again if anything has been disturbed recently, near the vac, or near any piping that would be your first suspect area.
Post back to advise.

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I have a Nutone central vacuum model number CV450W that was working great until I recently removed the hose and it now runs continuously until I pull the plug....any suggestions please


Disconnect the thin low voltage wiring between the vac and the rest of the house. If the vac continues to run you have a defective relay in the vac motor housing.
If the vac stops you have a short in the wiring in the house, likely behind an inlet in the wall.
If any inlets have been disturbed for painting or renos lately that would be the first spot to look in the house for a problem. Look for wires behind the inlet valve which are touching against each other or a mounting screw or against a metal mounting plate behind the inlet. Start at the last inlet used. Be careful not to loose the spring under the screws where the wiring attaches to the inlets

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We just installed a Hoover central vacuum system. As soon as we plug it in the system starts even if the switch is off. If we disconnect the wire the system goes off. What did we do wrong?


You have either left the manual switch at the vac in the on position, or you have a low voltage short at one of your inlets in the house, or at the vac itself or where a pair of wires are connected together at a pipe junction.
Carefully go back inlet to inlet, remove the plates and be sure your mounting screw is not shorting two wires together. Trim any excess bare wire away and look for nicks in the insulation as well unless you see an obvious short. If you are using telephone type multi colored wire it is easy to bare an inside piece of wire while stripping the outer insulation.
Also be sure sure wires are paired the same color pattern at each inlet.
It is common to see a stripped wire touching another inside the wall or if you have metal backing plates in the wall a wire may be touching the plate and triggering the vac to turn on. Post back to advise,
the other possibility is you have a nail or screw in a wall piercing the wire but this is seldom ...
take your time,its an easy fix but it might be hard to spot

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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!

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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. if your unit normally turns on when you plug the hose into the inlet then it would probably be a relay usually on the main tank itself try locating them and gently tapping on them with the rubber end of a screwdriver to see if you can un-stick them.

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Sounds like the relay that is in the central vac unit is stuck to the ON position. When you plug it back in..does it start right up ? If so.. You should be able to disconnect all the receptacle feeds to the central vac unit at the central vac unit to determine which one ( if any) is calling for the vac to stay on.. if none are.. then it is internal to the vac and may be a stuck relay... Hope that gives you some ideas to check...

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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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