No, the brush roll should spin continuously on medium pile carpet. The most likely cause is the brush roll switch being set incorrectly or a height adjustment issue.
Fix:
- Verify the brush roll switch is in the "On" position. There is a dedicated switch for carpets.
- Check the height adjustment setting on the nozzle. For medium pile carpet, it should be set to the middle setting, not the highest "Bare Floor" setting.
- If the setting is correct, unplug the vacuum and flip it over. Manually spin the brush roll. If there's resistance, remove any hair, string, or debris wrapped around the ends. This creates drag and can stall the motor.
- Inspect the drive belt for wear or damage. A worn belt can slip on thicker carpet.
If that didn't work: The carpet may be too plush for the vacuum's design, or the motor driving the brush roll may be underpowered for the specific fiber. Try using the vacuum in Lift-Away mode with the motorized nozzle detached; sometimes the angle change helps.