Mineis similar - they seem to be built a little poorly and are very sensitive to fluff from clothes collecting in valves connecting to water collecting tanks.
Try tipping upside down, taking off the water collection tank and removing the plastic valve at the top of it (mine clips into place) you should be able to remove all fluff from this.
Next unscrew the plastic part that connects this to the dryer (on the dryer) and doing similar to a small valve found in this.
Fingers crossed this helps!
Chris
November 2009