my shark duo clean just stopped picking up stuff on my carpet, it's like the brush roll isn't even spinning.

Diagnosis

The loss of suction and lack of brush roll rotation in the Shark Rotator Lift-Away DuoClean Pro ZU782 is typically caused by one of three things: a mode mismatch, a triggered safety shut-off, or a mechanical jam. The DuoClean system utilizes two rollers—a soft front roller and a traditional bristled rear brush roll. If the unit is set to "Hard Floor" mode, the rear bristled roll is electronically disabled to prevent streaking on tiles, which makes it feel as though the vacuum is simply pushing debris across your carpet. Furthermore, the ZU782 features a brush roll protection system. If a piece of string, a rug tassel, or a thick clump of hair jams the roll, the motor will automatically cut power to prevent the belt from snapping or the motor from overheating. You can confirm this by checking for a "brush roll obstructed" smell (a faint scent of hot rubber) or by attempting to spin the roll manually while the unit is unplugged; if it feels stiff or won't budge, you have a mechanical blockage. Lastly, because this is a Lift-Away model, the electrical connection between the canister and the floor nozzle can sometimes become loose or fouled with dust. If the pins aren't making a clean connection, the signal to spin the brush roll never reaches the motor, even if the suction motor is running perfectly.

How to Fix It

Follow these steps in order to restore brush roll functionality:

1. Verify Mode Selection: Locate the toggle switch on the canister/pod. Ensure it is clicked firmly into the "CARPET" position. If it is hovering between settings, the brush roll will not engage.
2. Power Down: Turn the vacuum off and unplug it from the wall outlet completely to avoid accidental activation during cleaning.
3. Detach the Floor Nozzle: Press the release button to separate the Lift-Away canister from the floor nozzle. This allows you to access the brush roll without fighting the weight of the machine.
4. Clear the Brush Roll: Flip the nozzle over. Use a pair of heavy-duty scissors or a seam ripper to cut through the hair and string wrapped around the rear bristled roll. Do not pull the hair out by hand, as this can stretch the belt.
5. Inspect the Soft Roller: Remove the front DuoClean soft roller by pulling it out of its housing. Check for debris trapped in the axle and wipe the roller clean with a damp cloth.
6. Check the Belt: Ensure the belt is still seated on the drive shaft. If the belt has slipped or snapped, the motor will hum but the brush will not spin.
7. Clean Electrical Contacts: Use a dry microfiber cloth or a can of compressed air to clean the metal contact pins where the canister connects to the nozzle.
8. Reassemble and Test: Click the canister back into the nozzle, set it to "CARPET," and power it on over a small rug to verify rotation.

If That Didn't Work

• Check for a Clogged Hose: A total blockage in the hose can create back-pressure that triggers the brush roll's safety shut-off. Detach the hose from the canister and drop a coin or a small ball through it. If it doesn't fall through freely, use a broom handle to push the clog out.
• Reset the Thermal Fuse: If the vacuum was used heavily on high-pile carpet, it may have overheated. Unplug the unit and let it sit for 30 to 60 minutes. This allows the internal thermal protector to reset.
• Inspect the Drive Belt: If you hear a high-pitched squealing sound but the brush isn't spinning, the belt has likely stretched or snapped. You will need to remove the bottom plate of the nozzle and replace the rubber drive belt.
• Test the Power Switch: If the "Carpet/Hard Floor" switch feels "mushy" or doesn't click, the internal switch may have failed. Try toggling it rapidly 10 times to clear any dust buildup inside the switch housing.

Heads Up

• Avoid High-Pile Shag: Using the ZU782 on extremely thick shag rugs can cause the brush roll to "bog down," which triggers the safety shut-off and can eventually wear out the motor.
• Regular Hair Removal: To prevent belt failure, cut the hair off the brush roll every two weeks. Allowing hair to build up creates friction that puts immense strain on the drive motor.
• Filter Maintenance: A clogged pre-motor foam filter reduces airflow, which can cause the motor to run hotter and trigger the brush roll protection system prematurely. Wash filters every 30 days.
• Avoid Wet Surfaces: Never use the DuoClean rollers on damp carpets. Moisture can cause debris to glue itself to the rollers, leading to imbalances and excessive vibration.