It is an 8.5KW electric shower. At the time, there was not a free fuse in our fuse box for the new circuit, so a new box was added containing an RCD (80A) and an MCB(40A). The shower runs from this, alone.
Suddenly this week, the shower started as normal, then there was a bang, and the water was cold. The RCD had tripped. The MCB was fine.
I reset the RCD, pulled the cord again for the shower, and the light flicks straight on and then off again. The dial on the shower at this point is in the off position.
I took the cover off the shower unit, and it looked ok, although a little damp inside. I also took the cover off the switch, and that looked ok, not damp. Looking in the loft, there is some damp around where the wires enter and leave, presumably steam through the hole.
The shower unit itsself is still under warranty, but does it sound as though this is what is the problem? From what I understand of an RCD it detects a current leakage?