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Up to my experience in my Panasonic vacuum cleaner, if the beater bar is not working this could be because the 'Carpet/Floor' selector switch is in the 'OFF' or 'FLOOR' position. In both of these positions the beater bar will not rotate. Move the selector switch to the 'CARPET' position. When in this position the beater bar will rotate once the foot pedal is pressed.
If the selector switch is in the 'CARPET' position and the beater bar is still not rotating it could be that there is something entangled in the beater bar, or the belt is worn or broken.
To check this first unplug the vacuum cleaner
Inspect the beater bar and belts to ensure that there is nothing entangled in the beater bar and that the belts are intact and are not excessively worn. If the belts are excessively worn they may slip resulting in the beater bar not rotating.
The vacuum cleaners often have an overload protection system inside the nozzle, which stops the nozzle motor when the beater bar jams to prevent belt breakage. After clearing any lint build up or jamming you may need to reset the overload protection, by pressing the reset button on the top of the floor nozzle.
Unplug the vacuum and lay it upside down on some newspaper. Remove the sole plate (bottom plate) with a screwdriver. Pull straight up on the brushes (called a beater bar) and remove the beater bar and belt. Remove the end caps and bearings from the ends of the beater bar (it may take a 2-grunt pull, or CAREFULLY pry the end caps and bearings from the beater bar with a screwdriver) Don't stab your hand with the screwdriver... That HURTS! Once you have the bearings and end caps off, remove the hair, carpet fibers and other gunk from the ends of the beater bar, end caps and bearings. Dribble a little rubbing alcohol on the bearings in the end caps and spin the bearings to clean them... keep dribbling alcohol in the bearings until the alcohol draining from the bearings is clear. Dry the bearings until there is no alcohol in them. Now would be a good time to check the opening in the vacuum head and the hose going into the body of the vacuum for clogs. Reinstall the bearings and end caps on the beater bar and reinstall the beater bar with a new belt in the machine. Reinstall the sole plate. Your machine should run like new.
Can you pull the bar and check the end caps to be sure they spin seperate of the bar? Also look at the wheel from the motor that turns the belt. This may be spinning on the shaft which could be caused by a broken pin.
If there is no suction when you disconnect the beater bar assembly near the hand hold where you grab the vacuum, then there may be either a restriction in the vacuum line between there and the vacuum section (that rolls around behind you), or the vacuum line from the handle point to the rollaround section is not properly connected. This all assumes the vacuum motor in the rollaround is running.
The beater bar section does nothing but cause dirt particles to be sucked into the vacuum system. The vacuum or suction is created in the rollaround unit.