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Why has it started making a humming noise. Belts are fine

Was using it. Had to get to a hard to reach place so handle was all the way back almost to floor. When I came back to normal position it started making a humming noise and brushes won’t spin. Nothing broke and no bad burnt smells. Please help

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crwdns2933313:01crwdne2933313:0

Perhaps the brushes picked up extra dirt in a hard to reach place and are jammed and the humming is the motor trying to turn. Clean brushes and ensure they are free to turn.

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