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Thank you all. I have wrapped sandwich and no water. The pressure doesn’t go more than 1 .5 bar which I topped up. It is only winter time when central heat running, day one it is at 1.5bar and day two

while bleeding radiator the water is clean

Sorry. Can you please tell where I have wrap sandwich bag ?

Thank you sir. Just to make sure I understand. Are we trying to isolate if PRV leaking by wrapping sandwich bag?

Hello there Can expert help me with the problem of unvented hot water( mega flow) with two expansion valves and pressure gauge losing pressure only during winter when I turn on the central heating. I have got gas boiler Worcester installed. I could see two radiators always have gas or no water...