Filter might need cleaning out. Open the front door and on the lower right of the door is a small round button, this should release the lower front panel, mines a bit stiff so it needed some help. It drops down from the top towards you.
In there is the condensor. 2 small blue clips hold it in place, release these and pull out. Not too nice a job, probable full of wet fluff.
Run this under a tap to clear, dont use a knife!!
This should help.
I found this answer on this SITE, somewhere. Worked ok for me.
Richard Prosser, February 2006