There are three things to check:
Is the switch on the hood for brush speed set to full, or may it be set to OFF?
Remove the brush block from under the unit by pulling it down and unlatch each side. Is there a 1/4 inch square drive pin on one brush, about two inches long? It connects the brush to the drive mechanism.
Lastly, the drive mechanism in the base may be bound-up, and not spinning. If so, the unit needs disassembled to repair or replaced.
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