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Not all DC01s are the same, DA001 and DC01 have different hose lengths and wands. I suspect you have swapped over a hose or wand from one type to another.
Is the bit at the bottom of the hose that clips into the machine properly clipped in? I find them a right pain to get in, but they must go in, as the wand penetrates (oo-er) the machine itself, so if the hose isnt in properly, it'll get stuck as it's not properly straight.There's a locking tab that must be pushed until it's near flush, it's this that can be the pain, it'll give a proper click when it goes.Probably anyway, good luck!
Put a drop of oil around the rubber top of the hose where it slides up the wand and see if it slides up fully? Is the rubber end folded under itself as they often do? If it's folded too much it could be binding somewhere?
Is the metal part of the wand all the way home in the plastic part of the wand?