If you hear the motor in the head running and the beater bar isn't rotating, you probably need a drive belt. With the power off, make sure you can rotate the beater bar freely by hand, if it isn't bound up.. then locate and remove the baseplate screws to gain access to the beater bar itself, you'll see a drive belt pulley system and chances are, a broken belt. Replace it with a new one by pulling the beater bar assembly out of the housing and plcing the belt onto the motor shaft pulley as well as the beater bar pulley.. nest the beater bar back into the holder and reinstall the cover. Hope that helps !
SOURCE: dyson DC 14 lost suction to beater bar/ suction to hose/stick
My Dyson DC14 had no suction...see if this works...turn the Dyson upside down...there is a length of hose that connects the bottom of the vacuum to the top, careful remove one end of the hose and check for debris...mine was clogged. Removed the clog and voila...it works. Thanks for the above info on checking the hose for cracks.
SOURCE: beater bar on Dyson upright won't turn when handle is lowered
you need a new belt and maybe a new brushbar.
SOURCE: Beater bar not working on Halo vacuum
Check the bar to see if there is a buildup of hair or string causing it to jam,
SOURCE: The beater bar on my Dyson won't turn. The vacuum
The belt doesn't have to be broken to make the vacuum not work correctly. If the belt is stretched the vacuum won't operate the way it is supposed to. You can get replacement Dyson Belts here:
Dyson Replacement Belts
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beater bar won't turn
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