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When I turn the vacuum on there is no suction and when I then go to turn it off it sounds as though it is backfiring. It is a Dc39

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Hi Robyn, it's Jack at Dyson.

From what you've described, it sounds like your DC39 is blocked. This would prevent the machine from picking up as well as it should do, and will cause the relief valve to activate, making the 'backfiring' noise you've mentioned.

We'd recommend checking the floor tool, telescopic wand and hose for blockages. If you can't find any, it's likely the blockage will be in the duct hose. Our Online Support guide will walk you through how to clear this: http://www.dyson.com/support/dc39/dc39-animal/diagnosis-root-menu/performance-flo-extension-tube-suction-check-dc39

It's also a good idea to give the filter a wash, as shown in the video attached. This should be done at least once every three months in normal use. We recommend using cold water without any detergent, then allowing the filter to dry completely for at least 24 hours before replacing it.

I'm confident this will resolve the issue, but if you would like any further advice from our experts please email askdysonUS@dyson.com and we'll be in touch as soon as possible.

Best wishes,

Jack
Dyson Online Customer Support
www.dyson.com

Posted on Oct 17, 2013

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The air passage form the brush area to the bag is plugged somewhere. Remove the lower plate and the bag above so that you have access to the air passage from both ends. A hooked, stiff wire will help pull the debris out. This problem is usually caused by delaying a change to a clean bag. A higher-pitched motor/fan sound is a clue that air flow is being restricted.

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