Ya location would help.
PM me and if ya can Send me a PCB board OR one of the units I can have a look.
My gut feel is the same as a few others I have seen and is a simple TRIAC driver that is under rated and or the spacing between teh tracks are not correct and can arc and short. Thus teh main driver to a Pump etc can just be full on even though you have not selected it.
Basic Electronics 101.
PS. It is all running 240V so it is not recommended for un qualified people to start playing.
Ya in Brisbane = OK Outside of Brisbane = going to cost you transport.