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Cheers MIGEM I'll check the pump when I get home According to the instructions on the boiler the pressure should be 1.5 and the turning of the blue cap will top it up. I know it wasn't much below but thought I might as well try it.

Hi, I have an Isofast condens boiler the problem I have is that when you turn the hot water on there is a hammering noise from the boiler. It lasts for a fair bit I usually turn the hot water off and it stops shortly after. I'm not sure if this is related but the pressure is a bit low...