Hi Joanne, it's Jack at Dyson.
I'm sorry to hear you're having difficulty with your DC39 Multi Floor. If the brush bar only seems to be working intermittently, we should be able to help - and if a replacement part is needed we can confirm if this is covered under our 5-year warranty.
When you have your machine easily to hand, please give our experts a call on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).
We'll look forward to hearing from you.
SOURCE: DC 07 BRUSH BAR DOES NOT TURN BELT OK
Stand vacuum up and with it plugged in. Rotate knob between carpet and bare floor and back 5 times leaving it on carpet when finished. Rotate vacuum back from upright position and lay vacuum on the floor, rotating it onto its side. Turn vacuum on.
SOURCE: The brush bar on my Dyson DC17 stopped turning.
If this model has a brush control - i.e a roller at the side of the model which controls brush to spin or not, then its a protected brush model - therefore even if the drive belt is intact the Dyson would have to be repaired by a service personnel or professional. The brush protection isn't able to be taken apart and sounds like it may well have slipped off due to tension.
SOURCE: motorized brush bar not turning on Dyson Vacuum
Apparent common failure is that either the thin yellow and or blue motor drive wires that run from the LH side of the vacuum where the "control board" is located down into the hinge / ball area become stretched and then fray and eventually break. Happened to my Dyson twice. First repaired under warranty, second took about 20 minutes. You need a Torx screwdriver to remove the LH panel ( 4 screws) and also an access panel (2 screws) at the side of the ball which permits access to the blue / yellow wire connectors. I replaced with a new wire and connectors having fed the wires through the access hole making sure sure enough wire was available for the movement of the handle. Also ensure that when the covers are replaced they do not trap any wires underneath.
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