Shower overheating

I think you may havea faulty 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 heats itcuts the power off to the elements)

See Video.

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

However regarding the overheating  the things to checkfirst are.

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water
getting to your shower to cool it properly, the overheat safety devicewill turn
the power off until it cools, then it then it starts to heat again andso on.

Make sure that the shower headis clean and clear, that the hose isn’t kinked (this can happen just behind thehand set where it is difficult to see) also check the inside of the hosealthough it can look OK on the outside it could have collapsed internally

The other possibility is a faulty flow/stabilizer valve not allowingthe correct amount of water into the shower.

A rough check is to remove the shower head turn temperature control tofully hot the water coming out of the hose should be a bit more than a dribblethen turn to fully cold and it should be coming out at full flow.

If there is not much difference between the two then you could have afaulty flow valve.

Carry out this check after you check the inlet valves.

As it is a Triton have a look at the outlet TCO

The outlet Thermal Cut Out this is a black disk with two wires going toit and it is mounted on the out let pipe (The bit between the heating tank andthe hose)

Examine the connections closely if you see any discoloration / signs ofoverheating then the TCO needs replaced.

 open / close thesafety device that allows power through to the elements