My dyson dc25 pipe has lost suction..is something stuck in the pipe?

Check the hose connection for leaks and filters. Here is a tutorial video on the DC25 possible loss of suction -
How to fix loss of suction in Dyson DC25 vacuum cleaner

Check belt,s and tensioners,sharpen blades on a grinding stone.

yes roller motor and suction motor

If you did put it together as it should, the only thing I can think of, is something got stuck in the pipe. Check this.
Old vacuums you could put the hose and or pipe to the other end of the vacuum, to blow it out. Now you have to be a little inventive to check a blockage.

Hi there it sounds like there is a blockage somewhere in the bottom behind the brushes.

Hi there, it's Jack at Dyson.
I'm not sure from your question how you're testing the suction at the cleaner head. For safety reasons we'd strongly advise against placing a hand underneath the cleaner head. This is not a good way of testing suction - the soleplate needs to form a close seal with the floor surface for high pick up. It's normal for the suction to feel stronger through the wand and through the cleaner head inlet as the suction is concentrated over a much smaller area.
If you place the cleaner head on a sheet of newspaper, then run the machine with the brush bar turned off, you should see the newspaper sticks to the cleaner head, as it's able to seal with the soleplate.
You might also like to take a look at our online Support guide, to make sure there's nothing blocking the machine which you may have missed: http://www.dyson.co.uk/support/dc25/dc25-multi-floor/my-machine-is-not-working/machine-not-sucking-picking-up-as-well-as-usual/how-to-wash-filters/check-suction
If you have any further questions, it would be worth giving our freephone UK Helpline a call to run through some diagnostic checks with one of experts. You can reach us on 0800 298 0298 - we're on hand to help from 7am-10pm, 7 days a week, and calls are free from UK landlines.
Best wishes,
Jack
Dyson Online Customer Support
http://www.dyson.com

click this link for instructions
http://www.videojug.com/film/loss-of-suction-dyson-dc25

Hi there,

Sorry to hear you're having a problem with your DC25. You should be able to resolve the issue by following these simple steps: http://www.dyson.co.uk/support/help.asp?article=1934&product=DC25-ALLFLOORS

However, if you're still experiencing difficulties, please get in touch with us, free, on 08002980298 (UK), or 1866MYDYSON (US), so we can run through some checks over the phone.

Kind regards,

Jack
Dyson Customer Service

You can view / download / print your user manual here:

http://www.manualnguide.com/manual-get/20752/

If you have lost suction, you most likely have a blockage or the filters need cleaning.

Please rate my solution if you find this helpful. Thanks.

there may be a small cut in the tube or there is something stuck restricting the suction check all hoses