Micro Switch 21 Amp (2 pin - universal)

If the water has gone absolutelycold then it is likely to be the TCO that has failed unfortunately this is nowobsolete.

See below for how to checkthe TCO

I think you may have afaulty Thermal Cut Out

A faulty TCO will have no continuity across the twoterminals (The black thing on top of the heating tank)

Therefore a good TCO will have power at both connectionsand a faulty TCO will have power at only one.

(The function of the TCO is, if the water over heats itcuts the power off to the elements)

See Video.

http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs

I’ll post this on the forum as well although I haven’t read the complete thread.

However.....The Sport Max doesn’t have  micro switches all the switching is done on the board with relays.