> I can't spot the thermal cut!
> I have removed the heater and all seems clear (I can blow through the
> and outlets without problem). I'm sure a tiny little ball came out of the
> pipe that the plastic tube went over.
> Any clues?
Sounds like a problem I had with a Gainsbourgh shower a few weeks ago,
the little ball is a safety device to stop the water overheating,
usually pops out when the shower head or tube is blocked or kinked. I
refitted the ball ( took ages and I learned new swear words doing it )
worked fine for a few months then the dam heater died :-(