Lack of Suction and roller not working

You say the belt is not broken and the roller does not spin. Does the motor that spins the belt turn. If the belt does not spin and the little drive motor spins then you will burn the belt out. Try to turn the roller by hand. Could be plugged up with dirt and the roller seized. The little drive motor could be burnt out. Take all hoses and areas out that any dirt could be in. No suction means something is plugged. Even your main suction hose could be plugged.

Is the suction control plastic ring shut?. If it's wide open you get almost no suction. See picture.
If that is closed check the long metal wand. Disconnect from the beater bar head and check the whole length of the wand and look into the beater bar head opening for something plugging it.

your cyclone assembly may need to be striped down and cleaned also remove the exhurst filter located under the bin.

It sounds like the roller brush is going, but the vacuum isn't working, i.e., no suction.
If you have a canister vacuum, disconnect wands from hose and place hand at end of hose. If there is suction, it's fine. If not, disconnect hose from vacuum, turn on vacuum, and hold hand to intake. If there's suction here, then the hose must be clogged; or holey hose can result in greatly reduced suction.
If it's an upright, the hose could be clogged. Or the fan broken, which would also result in no suction. It would help to know what model you have.

My Dyson dc18 had the same symptoms. The wand worked well and the floor bar had no suction. After removing pieces & shoving my fingers into the machine (no blockage) I found the suction pipe rotates between two positions (floor and wand). It looks like a piece of plastic broke on the outside housing, so it no longer rotates positions when the wheels are raised or lowered. My son found we can move the suction by sliding a finger into the mechanism behind the wheel cover, and rotating the plastic piece clock-wise or counter clock-wise until it locks into position. It's a big pain but it works for now. I wish I could find a replacement piece online. Patty

Hi its Darran at Dyson.

From your description of the problem, it sounds as though the wand/hose is blocked. To check this, remove the wand/hose assembly from the machine, switch it on and test the suction from the top of the wand with your hand. If the suction is poor, remove the wand from the hose and test the suction from the top of the hose. If its good here, then you know that the wand handle is blocked.

For the full diagnostics, check out the Support section on our website at www.dyson.com or call our Helpline on 1866MYDYSON.

Kind regards
Darran
Dyson Customer Service

Hi its Darran at Dyson.

It sounds as though the wand handle is blocked. To check this, remove the wand/hose from the machine as if you were going to use it to vacuum the stairs. Switch the machine on and test the suction at the top of the wand handle with your hand. If the suction from the wand is poor, remove the wand from the hose and test the suction again from the top of the hose. If the suction here is good, then you know the wand handle is blocked. If the suction is poor at the hose, you can remove the hose from the machine and clear any blockages here.

For the full blockage procedure please visit the support section on our website at www.dyson.com.

Kind regards

Darran
Dyson customer Service

yes re adjust

thers a hole in the pipe

1. i cleaned out my fanton and no suction in wand and still whistles