Potterton Gold ,hot water problem

[allan]

I have Potterton Gold HE24 combi boiler. It has recently started to have a problem where the hot water will go cold after a few seconds of running and getting warm later , the water in the kitchen is fine is hot enough, but in the bathroom it getting cold,warm,cold again , the bathroom is just 3meter from the boiler .
the other issue i have the pressure of the boiler dropping down to zero after one hour , and when i fill it with water till 1.2 bars , it dropping again ...
The gas engineer he cleaned and washed the heat exchanger two times but i still have a problem ...
If i put a new heat exchanger will solve the problem ? what about the pressure problem ?

Thanks in advance

 

[Dotty]

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