If the roller (brush agitator) on your Kenmore Model 116.31200210 vacuum cleaner is not spinning, there might be a blockage, a belt issue, or a malfunction. Here's a general guide on how to troubleshoot and potentially reset the roller: 1. Turn Off and Unplug the Vacuum: Ensure the vacuum is turned off and unplugged from the power source before performing any maintenance. 2. Check for Blockages: Examine the roller area and the nozzle for any debris, hair, or threads that might be obstructing the roller's movement. Use scissors or a tool to carefully remove any obstructions. 3. Inspect the Belt: The roller is usually powered by a belt. If the belt is loose, damaged, or worn out, it can prevent the roller from spinning. Remove the bottom cover or nozzle to access the roller and belt. If the belt is damaged or loose, you may need to replace it. 4. Reset the Belt: If the belt is still in good condition, it's possible that it has come off its track. Follow your vacuum's user manual for instructions on how to reset and properly position the belt on the roller and motor shaft. 5. Remove Tangled Debris: Gently rotate the roller by hand to see if it spins freely. If there's a lot of tangled hair or debris, you might need to carefully cut and remove it. 6. Check for Overheating: Some vacuums have a thermal protection feature that automatically stops the roller if it gets too hot. Wait for a while and let the vacuum cool down if this might be the case. 7. Reassemble and Test: Reassemble any parts you removed and securely fasten them. Plug in the vacuum and turn it on to see if the roller now spins. If it does, your troubleshooting steps might have resolved the issue. 8. Professional Help: If the roller still doesn't spin after trying these steps, there might be a more complex issue. It's recommended to consult your vacuum's user manual or contact Kenmore's customer support for assistance. If you're comfortable, you can also consider reaching out to a professional appliance technician for further diagnosis and repair. Remember that the steps above are general guidelines and the exact process might differ based on the specific model of your Kenmore Model 116.31200210 vacuum cleaner. Always refer to your vacuum's user manual for accurate and model-specific instructions.