From looking at various sites on the Internet, it looks as though this is caused by a faulty or damp heater in the drier. The advice seems to be to leave the drier to "dry out" for a while (i.e a couple of hours). If the fault is not resolved, then leave it a little while longer. If the fault persists, then the best advice is to get an engineer to look at it. Sorry I can't be more specific.
floyd
February 2008