no hot water

Ifthe shower is absolutely cold then I think you may have a faultyThermal Cut Out

Afaulty TCO will have no continuity across the two terminals (Theblack thing on top of the heating tank)

Thereforea good TCO will have power at both connections and a faulty TCO willhave power at only one.

(Thefunction of the TCO is, if the water over heats it cuts the power offto the elements)

SeeVideo.

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

Ifthere is some heat it may be a faulty element in the heating tank(there are two, three in most 10kw showers) you can check them with amulti meter you should have a reading of around 12>18 ohms.

Ifyou have power to the elements and no heat it'sprobablythe elements, no power to the elements then it's probably a microswitch.

Ifyou don’t have a multimeter  we sell them at £10 each with aguide on how to use them for checking and testing the various partsof your shower.

Apartfrom helping to fix your shower, they are really useful for checkingyou have a power supply to appliances, for checking fuses, lettingyou know much power you have left in batteries

(soyou know if they are dud or not)  and lots of other jobs, inshort they are well  worth the £10.