Lack of suction

Check both belts

You've probably got a lesser blockage further down the pipework, which is reducing the airflow. Check everywhere possible for blockages, and also make sure the washable filter is clean and dry.

Hi its Darran at Dyson.

From your description of the problem, it sounds as though the wand/hose is blocked. To test this, please remove the wand from the machine and switch on, testing the suction from the top of the wand handle. If the suction is poor, remove the wand from the hose and test the suction from the top of the hose. If its strong from the hose itself, the wand is blocked and you will need to clear this.

If there is poor suction from the hose, you can remove this by unclipping it from the base of the machine and can then remove any blockages. It is also worth checking the hose for any splits or holes.

If you need any further help or advice, please visit our website at www.dyson.com and check out our support section.

Kind regards
Darran
Dyson Customer Service

That means that you need to replace the belt. Here is the belt you need and the manual:

Dyson DC07 Belt

I would try changing the belt. If the belt(s) are worn or stretch it will not pick up well. Here is the belt you need:

Dyson DC07 Belt and Manual

it is probably clogged near where the floor part picks up
that is why the wand still works

The belt is probably worn or stretched. When this happens the belt won't turn the roller brush when it is against the carpet. Here is a link for the manual and links for the belt you need:

DC07 Manual

Replacement belts for DC07 w/ clutch system

Replacement belts for DC07 w/out clutch system

Clearly no one read the question problem is not low suction but too much

Most hoses will have a rotary device near the business end which allows air to escape or bypass the suction end. Look for this and rotate or slide it back

You have a clog in either your hose or your wand. You need to take off the wand and hose and inspect them.