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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.
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.
Unfortunately I don't have a part number for you, but you can call this number 1800.322.2965. Tell them you need a new relay board for your system and they'll be able to help you. They cost around 99$. for anything else you might need, go to www.thinkvacuums.com
Sometimes mine "wand" has no suction too. . . Make sure the vacumn column is clicked into the "standing" position, don't have it at an angle. Also you may have to play with the settings on the bottom part AND the power button together. I think this vacumn sucks (pardon the pun) mine turns off after 10 minutes of use, then I let it sit for an hour and then it'll start again. POS!
Make sure you have a good bag installed in the vacuum and the door is properly in place. Remove the attachment hose from the bag chamber and turn the machine on. You should have good suction coming from the hose inlet. If you don't you have a problem in the bag chamber. Bad bag, door is not on correct, door is defective, dirty secondary filter.
Connect the hose back to the machine and pull the other end out from the bottom, and turn the machine on. You should have good suction there. If you don't you have a clog or hole in the attachment hose and it needs to be unclogged or relplaced.
Reconnect the to the bottom. Flip the mahine upside down. Take the screws out of the bottom plate and remove. Remove the brushroller and belt. Turn the machine on and you should have suction at the inlet coming off the brushhousing. It you don't, then you have a clog in the nozzle hose and it needs to be removed. It will probably be more accessable from the bottom side since that is the way that it entered.
Sometimes a suction problem can be confused with an brush problem. The belts on that machine should be replaced every 6 to 8 months because they will strentch and wear. This is an inexpensive maitainance that will dramatically improve its function. Part Numbers are 38528-035 and 38528-034
You need to figure out if it is the hose that is clogged, or in the piping. If in the hose, you can use a long plumbers snake to try to remove the clog. If you have no suction in none of the outlets, then I would suspect the hose, or the main pipe came loose from the cannister. Also are you sure that the cannasiter is coming on? If the blockage is in the piping, you can use the plumbers snake there also.