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Check suction at intake without any hose connected. If that is good, then connect hose and check suction again. If that is poor, then you have a clog. If still good, then check power nozzle by getting into the belt area. RainVac www.rainvac.com 800-523-0510
I would recommend checking your wall outlets where the hose plugs in for any type of clog in the tubing. If the vacuum itself has great suction but when you go to the wall outlets that is probably something in the hose that is stuck. If cleared it will most likely have excellent suction throughout the entire system in the house.
Are you getting good section at the wall inlet? If so, see below.
Check for a clog inside the power nozzle. Detach wands and drop a small coin into connection. It should fall through. If it doesn't, there's a clog that needs cleared.
A leaky hose could be the problem. Any vacuum hose is often mistreated, though intentionally. But due to the length of the CV hose, it undergoes quite a bit. Being constantly dragged around corners and pulled around, as well as improper storage can all result in holes/leaks in the hose. A few tiny holes throughout the length of the hose will result in an often dramatic loss of suction.
How old is the vacuum? It may be time to replace the hose.
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.
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.
Poor suction can be caused by obstructions, poor air flow or a compomise in the air flow (hole in the hose). Since you have started with that I would next look at all filters and clean them. First check for suction at the motor, then at accessory hose and then the base. this will lead you to a suction issue. If your baelt has not been replaced in the last 6-12 mo I would change that too. check to make sure your carpet setting is coorect for the carpet being cleaned.
if the blower is much stronger than the suction, you may have an air leakwhere the cover fits on tank or possibly a warped tank or cover. feel all around the unit for air being drawn in somewhere besides the hose. try it without the hose on and block the inlet for a couple seconds to see if the unit leaks air in. also replace the filter , dont try to clean it, the pores clog and reduce suction and damage motor.