my shark navigator lift away pro brushroll just stopped spinning on my carpet. help?

Diagnosis

The Shark Navigator Lift-Away Professional NV356E utilizes a belt-driven brushroll system. When the roll stops spinning on carpet, it is typically caused by one of three things: a physical obstruction (hair/string), a snapped drive belt, or a tripped electronic overload protector. Because this model features a "Lift-Away" canister, a common point of failure is the connection between the main power head and the canister; if the electrical pins are not fully seated, the motor may power the suction but fail to engage the brushroll. To confirm the cause, perform a "spin test." Unplug the unit, flip it over, and attempt to rotate the brushroll manually with your hand. If it feels rigid or "locked," you have a physical jam. If it spins with absolutely no resistance (feeling "loose" or "floppy"), the rubber belt has likely snapped or slipped off the drive gear. If it spins freely but won't engage when powered on, the issue is likely electrical or related to the floor setting selector.

How to Fix It

Follow these steps to clear a jam and reset the drive system:

1. Disconnect the vacuum from the wall outlet and remove the battery if using a cordless variant (though the NV356E is primarily corded).
2. Press the Lift-Away button to separate the canister from the floor nozzle. This gives you better access to the underside of the power head.
3. Locate the brushroll access panel on the bottom of the nozzle. Use a coin or a flat-head screwdriver to rotate the locks and remove the cover.
4. Inspect the brushroll for "hair rings"—tight bands of hair and carpet fibers that wind around the ends of the roll. These create friction that prevents the motor from turning the roll.
5. Use a pair of heavy-duty sewing shears or a utility knife to cut through the hair wraps. Be careful not to slice the bristles of the brushroll itself.
6. Pull out any clumps of lint or large debris (like coins or small toys) that may be wedged between the brushroll and the plastic housing.
7. Manually rotate the brushroll to ensure it spins 360 degrees without any clicking or resistance.
8. Reinstall the access cover, snap the canister back into the Lift-Away position, and ensure the "Floor" setting is selected on the dial before powering on.

If That Didn't Work

• Replace the Drive Belt: If the brushroll spins too easily by hand, the belt is broken. You will need to remove the brushroll entirely and replace the rubber belt. Ensure the new belt is seated perfectly in the groove of the motor drive gear to prevent it from slipping again.
• Check the Brushroll Switch: The NV356E has a safety mechanism that disables the brushroll when used on hard floors. Ensure the dial is clicked firmly into the "Carpet" position. If the switch is worn out, the vacuum may "think" it is on hard floor mode even when set to carpet.
• Inspect the Motor Carbon Brushes: If you hear the suction motor running but the brushroll motor is silent (no humming sound), the motor brushes may have worn down. This requires opening the motor housing to check for electrical continuity.
• Clear the Suction Path: A massive clog in the hose can create back-pressure that triggers the thermal protector, shutting down the brushroll motor to prevent overheating. Remove the hose and drop a coin through it to ensure it is completely clear.

Heads Up

• Avoid "Over-winding": Never let hair build up to the point where the roll is hard to turn; this puts immense strain on the motor and is the primary cause of snapped belts.
• Check the Height Adjustment: If the vacuum is set too high, the brushroll may not make contact with the carpet, making it seem like it isn't spinning.
• Use Correct Attachments: Never use the "Carpet" setting on high-pile rugs or shag carpets, as this can cause the brushroll to seize and trip the overload protector.
• Regular Maintenance: Clean the brushroll every 2-3 weeks if you have pets or long-haired residents to extend the life of the drive belt.