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Dean744PiN5
I am sorry that you don't appreciate my advice and that you think that its incorrect.
However, I do think that its correct and I will explain why!
The normal lowest price for new parts which you have listed are:-
Heat exchanger changed £080
* PCB changed £130
* thermistors changed a while back £020
* divertor valve changed. £100
That comes to a total of £330 ! Thats ignoring any charge for fitting them !
This is why the OP has got the hump, he has spunked all his money on parts not needed cannot afford a professional now regardless, so is seeking free advice from said professionals and is taking out his anger at his own incompetence on said professionals because the answers aren't the ones he is seeking for his own utter major fook up for what is a very easy fault to diagnose