I haven't seen that happen on a DC14. Are you saying that the flap that releases the dirt won't open when you press the red button on the top with your thumb? If so, see if you can release the trap door with a thin, flat bladed screwdriver. If you can get it open, then you can remove the clear bin assembly completely from the cyclone assembly by pushing the latch on the front of the cyclone chamber at the top of the clear bin assembly. You can then reseat the gasket and reassemble the whole thing. Hope this helps.
www.bobsroswellvacuum.com, September 2008