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If you've gotten 4 years out of a Shark you've already beat the system. Give yourself a pat on the back, throw it in the nearest dumpster, then go to your local vac shop and purchase a quality USA made vacuum cleaner that is repairable and will likely last 20-30 years. Chinese vacs are designed to last one year and parts are not made for Sharks.
Is the beater bar actually turning when the power is turned on? Sometimes the belt is fine, but something is jammed and keeping the beater bar from turning. What about the section behind the beater bar, but before the hose upright. I've found large pieces of paper jammed in here and then hair gets caught, ultimately blocking the whole system. Usually you have to turn it over, remove some screws and disconnect the belt and beater bar to get underneath. Just reassemble it in the reverse order to how you took it apart. Double check the hoses and run a "unwound" metal coat hanger through to unclog anything. Does the vacuum " suck" with the hose or tube up to it disconnected? If not you may have a motor that somehow got junk pulled into it. You can open this up as well and clean this out. Of course unplug it all before doing anything.
Based on your description, your unit has an air flow blockage. The shutdown sounds like thermal protection. Something is blocked, somewhere. You have to verify that each and every inch of the air flow passageways are open.
That type of vac is notorious for stopping up where the 90 degree turn is. You may need to access it from the vac head by removing the beater bar or take it apart where ever you can access the turns and hoses.
I'm not sure why this is happening. Perhaps if you would contact Hoover and explain the problem to them such that it appears that there is a safety issue with their product, they might be more cooperative. If that fails, I have had luck writing letters to the CEO's of companies. You can usually find the CEO name and address online. This is probably not exactly the info that you desire, but I thought I'd add my 2 cents.
this is a common problem it moves on air flow, the air flow may be good but there is stuff wrapped around the ends of the beater bar, disassemble bottom of the unit and clean real good. it comes apart real easy :)
All beater and rotating brush bars are fairly easy to get to with a couple of screw on the bottom of your wan. They are driven by a belt and these belts come off, break, or the bar itself is stuck with rug material. Unplug your vacumn and get our screwdriver. It;s easy to figure out once inside the wan.
Probably have a clogged intake from the beater bar thru to the vac system.. Try this.. with the vac unplugged, flip the vac over so you can get to the bottom of the vac head near where the brush rotates.. then depending on the model.. remove the cover to access the brush ( called a beater bar).
Once the cover has been removed ( may require removing several screws) .. look at the beater bar and make sure the belt is hooked up.. you should be able to lift that brush assembly out of the housing to expose the duct where dirt travels into the bag.. that path ( including the flex hose) is probably clogged up...clean out any debris found there.. ( if you have access to another vacuum..try sucking that junk out with it or use a stick or coat hanger to pry anything lodged in there out.. When that is clear, reassemble things and try it again.. Hope this helps you
http://geeksquad.fixya.com/ThreadView.aspx?prdid=0&thid=818384 Generic problem for all Vacuums I have a central vac. Posted by bmiller874 on July 22, 2008 I have a central vac. and the beater bar, for the carpet is not turning. The vacuum still sucks but the beater bar doesn't turn. I checked the belt it is fine. Hello, I would advise you to ALWAYS to FIRST UNPLUG YOUR VACUUM before beginning any service procedure. Even though the belt looks fine it does stretch out and then it will not spin the brushroll @ the speed it is supposed to spin, there are 2 or 3 things to check. #1. The brushroll has be turning or spinning freely without the belt being on the unit. #2. The motor pulley has to be spinning freely as well #3. The belt needs to be changed every 4 to 6 months for the best cleaning and to store the extras belts in a Ziploc bag in the refrigerator. So if you need further assistance, please feel free to contact your local vacuum cleaner dealer in your area or in the yellow pages, or contact the factory phone number or website to further assist you with your questions. I am not sure what the brand name of the central vac is, and maybe next time you can include the brand name and model #. Thanks, Don the Vac Man Go Ahead. Use Us.