No hot water, just cold at full pressure

No hot water would suggest a faulty TCO ( 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 bothconnections and a faulty TCO will have power at only one.

(The function of the TCO is, if the water over heatsit cuts the power off to the elements until the water cools, this can take upto 15mins)

See Video.

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

 

After fitting a new TCO

 

When fitting a new TCO listen to the shower, after it hascompleted its first on/off cycle, if when it is switched off you hear itcontinuing to heat (Noise like a kettle starting to boil) this will mean thatthere is a switch or a relay that is stuck in the on position, this is keepingan element energised and this is probably what caused the original TCO to fail.

If this is the case replace the faulty switch or relay andmake sure that you switch the shower off at the isolating switch when theshower is not in use because this may cause the new TCO to fail.

 

Cold at full pressure ?? if you mean that you can’t adjustthe water flow then that would suggest a faulty flow valve.

 

Sorry, my fault - TCO has continuity, first thing I checked.

Ran the solenoid out of circuit. It clicked a little and something moved inside but the valve stem(?) just visible at the inner end of the conduit didn't move. Should it?

How to test the pressure switch?!