Why does my shower run cold?

I have have a Triton Jade shower for about 4/5 years.
At first when I turn it on the hose down runs hot then little by little after about 5 minutes it runs cold afterwards if I leave it on it will be hot again.
The low pressure restrained doesnt come on and its fed by the D, not the hot water container.
Does this sound resembling a repair or replace job?


Answers:    It;s electric shower. No you don't have need of the heater on. Are you surrounded by a hard hose down area? I reflect on the boiler may be scaled up, it's getting too hot inside where on earth the therm cut out is - it's warming the marine, getting too hot inside, cutting out, cooling down, resetting, warm the water etc newly a thought

Spares here http://www.showerdoc.co.uk/shower-spares...
is your water stove on....?
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