V 10 only runs if you block the intake

Hi ​@Graham Lawrence,

Welcome to the Dyson community!

To troubleshoot your machine, Kindly remove the bin by the following steps:
Push the bin release catch to open the bin. Please ensure the bin is empty.
Press the red bin release button and slide the bin off of the cyclone.

Also, please check the bin Bin and cyclone by the following steps: 
Check the bin base and clean any dirt using a brush or dry cloth.
The bin can be cleaned with a damp, lint-free cloth only and must be completely dry before refitting.

Regarding the cyclone, Kindly use the brush, remove dust and debris from the cyclone shroud. This is the silver colored part of the cyclone with lots of holes in it.

1. Look inside the end of the cyclone where the wand and tools attach.
2. The dirt goes up this channel and then into the bin through a hole in the side of the cyclone. You should be able to see light shining through from either end.
3. Remove anything blocked in this channel.

Remove the fine dust and refit the bin by following steps: 

1. Slide the bin back onto the cyclone until you hear a click.
2. Close the bin base and push the bin back into place on the cyclone until you hear a click.

Kindly test the machine and please confirm that has this resolved the issue and is the machine showing any lights when you push the trigger. 

We'll look forward to speaking with you!