Here's another picture, that is the RIGHT way to install the soleplate:
I would say probably 6 times out of 10 this is the problem with the customers machine. If you checked the soleplate and it is installed correctly, move on to the second possible problem.Possible Problem # 2. Turn the vacuum cleaner upside down so the brush roller is facing upwards. I found the easiest way to work on it is to put it on a counter top or work bench. On the left hand side behind the roller brush you should see a flexible transparent hose that goes from the motor to the agitator housing. This hose actually has a lot of strain on it when the vacuum cleaner is in the reclined position. When the first few series of Dyson DC07 models came out, they didn't make this hose long enough, so when the vacuum was in the reclined position, it would put too much stress on the hose, and cause the hose to actually crack, usually right where the end of the hose that goes into the agitator housing. Examine your hose and see if you have any visible cracks in this hose. If you need to you may just remove the entire hose assembly by pulling on it. It will easily come right out of the machine so you can inspect it better. Here's a picture of where the hose usually cracks:
This would also explain why the vacuum works fine when using the attachments, but not on the floors. The attachment hose uses a different suction channel, and when the machine is in the upright position, no suction goes through this hose. If you do find a crack in this hose, the this hose needs to be replaced. Here's a direct link to that hose on our GoVacuum website. Dyson DC-07 & DC-14 Upright Replacement Internal Hose Part # 904219 Possible Problem #3. I would suspect that this may not be the problem, but if neither of the solutions above worked, then try this one. Dyson's in general are prone to clogging. There are a few clog ports throughout the vacuum cleaner that were added there due to Dyson prototypes becoming clogged at these points. Here are pictures of how and where to check for these clogs. Simply remove the suction port covers at both of these locations:
Possible Problem #4. If none of the above solutions worked for you, try this last one. The Dyson DC07 models use a clutch mechanism that stops the roller brush from spinning when changed from carpet mode to bare floor mode. This clutch mechanism is a notorious problem with all Dyson models, in fact they were such a problem that Dyson had to redesign the DC07 model to a non-clutch system. Even if yours is one of the newer ones that don't use a clutch, yours still has a belt inside. You can tell if your model uses a clutch or not by the shape of the roller brush. If your brush is a perfect cylinder shape, yours does NOT have a clutch. To check and see if the clutch or the belt have gone bad, first release the handle on the vacuum as if you were vacuuming carpets. Make sure the machine is set to carpet mode. Now while the handle has been released, turn the machine upside down and see if the brushes are spinning. If the brushes are spinning then turn the vacuum right side up and put the brushes on the floor. Can you still hear the brushes spinning when they are hitting the carpet? If yes, then this is not the problem. If the brushes however are NOT spinning, this indicates either your brush roll, clutch, or belt have gone bad. .I have had Dyson All Floors model,( the one with the clutch adjustment to allow transition from carpet to hard floor) for a number of years. Recently pick up from carpet particularly poor. Went through all the solutions as recommended on Dyson website. No blockages, no broken sole plate, bristles (should be around 7mm to 8mm long) protruding ok from soleplate ( these can wear slightly over time but not usually the problem), belt not broken nor slipping. Filters cleaned/ replaced, but still poor pickup. Checking for strength of suction, as recommended by Dyson, both at top of hose and at bottom right inlet revealed no problem there. It turned out the clear inlet hose coming from the soleplate to the underside of the machine was the problem from two viewpoints. Firstly, as can be expected, the clear hose can develop splits after a number of years due to wear and tear. The other, not so obvious, problem is that the hose is also a form of straight spring which is designed to be compressed to a certain degree to an S shape when the machine is in the upright position. Upon pulling the handle back, whilst pushing on the footrest at the bottom results in pressure from the hose/spring being applied to the rear of the sole plate, pushing it on to the carpet. Thereafter the suction takes over, keeping the soleplate firmly fixed to the carpet. The existing hose on my machine had settled in to an S shape over the several years I have had the machine, thereby not pushing firmly enough the rear of the soleplate on to the carpet ( I noticed a significant gap at the rear whilst using the machine). For the couple of splits I had effected a temporary repair using a couple of very narrow strips of Gaffa tape, whilst awaiting the new hose/spring, but only a marginal' if any, improvement. Upon receiving and attaching the new hose/spring the solepate was properly pressed onto the surface of the carpet and pickup was like new.
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