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Why are you filling the system to 2 bar pressure?Do you have the user manual?Normally 1 bar is more than enough,if you fill to 2 bar pressure when the system heats up and increases the pressure still further it will activate the prv.As said it could well be the expansion vessel,but it could also...

i ll say from the outset i am not a boiler installer nor a boiler service engineer.That said as a plumber i have had a fair amount of experience with combi systems.Without a doubt your system has developed a problem,it ran fine last year,now its problematic this year.Being that your boiler is a...

Irregardless of whether you are using copper or plastic piping,to ensure the maximum effectiveness of your heating system you should really pipe both the flow and returns of the heating system in 22mm pipe.This ensures adequate flow to all the radiators giving a faster heat up time on the rads...