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Open the door on the inlet port and look inside. You should see 2 small pins. These pins are spring loaded to make contact with the metal end of your hose when you plug it in. Two low voltage wires are screwed to the underside of these pins. The low voltage wires go all the way back to the low voltage switch/relay on your central vac power unit.
Sometimes one or both of these pins will just break so that they don't make contact with the end of your hose. If you see no pins or just one then you will have to replace the inlet cover.
If both pins are present; push down on them with your finger. If you feel resistance then your inlet is probably OK. CAUTION: IF YOUR CENTRAL VAC INLETS HAVE A 110 VOLT CONNECTION, REMOVAL/REPLACEMENT OF YOUR INLET SHOULD ONLY BE DONE BY A QUALIFIED ELECTRICIAN.
Remove the two screws in the faceplate. Carefully slide the inlet cover out. Check the two screw on wiring connections. Make sure both wires are securely attached and that there are no breaks.
If neither of the above fixed your problem, you may have a broken or disconnected wire somewhere between this inlet and the low voltage witch at your power unit.
No, there is only two possibilities. One, the low voltage wires are touching somewhere in the system or two, the relay is stuck in the on position. To find out which it is disconnect the low voltage wire from the unit (theres two clips on the side) and then plug the canister in. If the it still runs with the wire disconnected then it is the relay board. If it doesn't then it is the low voltage wiring in the system. Good luck!
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
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
Start with this. Unplug the vac to shut off, then disconnect the low voltage wiring at the vac.Plug the vac back in. If the vac still runs you have an internal short on the relay or wiring inside the vac. If the vac stops then the vac and final wiring is OK and the problem is in the wiring in the house. Have you removed any inlets for painting or had any renos done or pictures hung. If so undo what you did last. If inlets were disturbed remove them and look for low voltage vac wires touching metal backing plates in the wall or touching the inlet mounting screws. If you have done a reno or hung pictures you may have pierece the wire for the vac creating a low voltage short which will keep the vac running until removed. I have seen this happen with freshly installed 1/4 round molding along a baseboard
Some units have an on/off switch on the power unit itself. Check to make sure that is not turned on. Unplug your power unit and remove the 2 low voltage wires (not the power cord itself) . The low voltage wires start at the unit and run throught your home and attach to each hose inlet. They are usually attached to the unit by simple wire terminals or wire capped to small wires coming out. Just unlug the terminals or unscrew the wire caps and pull the connections apart. Plug your machine back in. If it still comes on the problem is the relay or circuit board/switch/ relay assembly inside the unit. If it doesn't come on with the low voltage wires unattached then you may have two wires touching somewhere in the low voltage wiring.
If the central vacuum tank will not turn OFF even with the switch in the “OFF” position, then the low-voltage wires should be disconnected from the tank.If the tank continues to run and still will not turn off, then most likely the relay inside is defective (but it could be a defective and/or shorted ON/OFF switch). If with the low-voltage wires disconnected the tank is able to then be turned off with the switch, then there is a short in the low-voltage wires or a hose is plugged into an inlet somewhere. ~ TTURAMBAR
Try to plug the hose in sideways. So the top of the hose is rotated 90 degrees. If the unit turns on then there is something wrong with the hose. It might be a short or it could be a bad switch on the handle. If the unit still wont turn on I would think that maybe the low voltage wire got disconnected from the unit or there is a break in the low voltage wire somewhere along the way. Let me know if you plugging the hose in sideways works.
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!!