the brushroll on my vertex just stopped spinning on carpet, works fine on hard floors though.

Diagnosis

The Shark Vertex DuoClean PowerFins (AZ2002) utilizes a dual-brushroll system where the front soft roller is designed for hard floors and the rear PowerFins brushroll is designed for carpets. When the rear brushroll stops spinning specifically on carpet, it is usually caused by one of two things: an electronic "overload" trip or a mechanical obstruction in the brushroll drive gear. The vacuum has a built-in safety mechanism that kills power to the motor the moment it detects excessive resistance to prevent the motor from burning out. If the brushroll works on hard floors but fails on carpet, it indicates the motor is functioning, but the increased friction of carpet fibers—combined with any accumulated hair or debris—is triggering the safety shut-off. You can confirm this by listening for a faint "click" or a momentary humming sound followed by silence when you push the vacuum onto a rug. If there is no sound at all, the issue is likely a sheared drive belt or a jammed gear assembly within the nozzle head.

How to Fix It

To resolve the brushroll failure, you must perform a deep clean of the PowerFins assembly and reset the motor's load sensor. Follow these steps exactly:

1. Power down the vacuum and disconnect it from the wall outlet to prevent accidental activation.
2. Lay the vacuum on its back. Use a coin or a flat-head screwdriver to turn the brushroll lock (located on the side of the nozzle) counter-clockwise to unlock the assembly.
3. Slide the brushroll assembly out of the housing. Use a pair of heavy-duty scissors or a seam ripper to cut through the hair and string wrapped around the PowerFins. Do not pull the hair manually, as this can stretch the internal drive belt.
4. Check the end caps of the brushroll. Remove any compacted debris from the bearings; if the bearings are clogged, the roll cannot spin freely, triggering the overload sensor.
5. Inspect the drive gear (the small plastic sprocket) for any missing teeth or debris. Clear it with a toothpick or compressed air.
6. Slide the brushroll back into the housing until it clicks, then lock it securely with the coin/screwdriver.
7. Switch the floor nozzle dial to the "Carpet" setting.
8. Perform a "hard reset": Hold the power button down for 10 seconds while the unit is plugged in to clear any stored error codes in the motor controller.

If That Didn't Work

• Check for a Broken Drive Belt: If the motor is humming but the roll isn't moving, the rubber belt has likely snapped or slipped. You will need to remove the nozzle housing screws to access the internal belt. If the belt is loose or snapped, replace it with a high-torque compatible belt specifically for the AZ2002 model.
• Inspect the Suction Path: A blockage in the main hose or the "neck" of the vacuum can create a vacuum seal that puts undue pressure on the brushroll motor. Remove the nozzle and check for a clog of pet hair or a stuck object (like a coin or toy) in the throat of the machine.
• Verify the Floor Sensor: The AZ2002 uses sensors to detect floor type. If the sensors are coated in thick dust, the vacuum may "think" it is still on a hard floor even when on carpet. Use a damp microfiber cloth to wipe the sensors located on the underside of the nozzle head.
• Test the Power Cord: In rare cases, a partial break in the internal wiring of the power cord can cause the motor to receive enough voltage for the low-power hard floor mode, but not enough amperage to drive the high-torque carpet mode. Try a different outlet on a separate circuit breaker to rule out power fluctuations.

Heads Up

• Avoid using the vacuum on high-pile "shag" carpets, as these are the primary cause of motor overloads and belt snaps on the Vertex series.
• Clean the PowerFins every 30 days; the "fins" are designed to prevent tangles, but long hair eventually wraps around the axle, increasing friction.
• Never use liquid cleaners or water directly on the brushroll assembly, as this can rust the bearings and lead to permanent seizing.
• Ensure the nozzle is fully clicked into the wand; a loose connection can cause intermittent power loss to the brushroll.