Triton 82600700

You are going to have to replace the complete stab valve Triton don’t do a kit for this.

 The replacement is fairly straight forward.

Turn of the water and power you then have to dismantle most of the inside of the shower to get enough space to slip the old part out and the new part in.

This sounds more difficult than it actually is, however you do have to be methodical noting where screws/nuts etc. come from and what goes where and it is always a good idea to take photos as you go because you can refer to them when you are rebuilding.

It is unlikely that the head would cause the stab valve to leak however these types of head often cause back pressure and therefore could cause the problem.

The cold water could be caused by a faulty PCB, however as the stabilizing valve is leaking you will have to fix this first.

It’s going to need a new stab valve

 http://www.showerdoc.com/shower-spares/trito-82600700-stabiliser-valve-assembly---up-to-9-5kw-rated-units

The things to check first 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 device will turn
the power off until it cools Then it all starts again

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

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

A ruff check is to remove the shower head turn temperature control to fully hot the water coming out of the hose should be a bit more than a dribble then 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 a faulty flow valve.

Carry out this check after you check the inlet valves.

Also if 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 to it and it is mounted on the out let pipe (The bit between the heating tank and the hose)
Examine the connections closely if you see any discoloration / signs of overheating then the TCO needs replaced.