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loss of pressure?

Once my boiler has been switched off it loses its pressure very quickly, on checking ouside the house on the wall where the boiler is mounted i found water coming out of a pipe. This i believe is the problem, but have anybody any idea how to fix it please.
john, October 2009
expansion vessel needs re-pressurised, that's what's causing it to leak from the prv.

Ian, October 2009
This pipe is connected to the pressure release valve or PRV. Ask your gas man to replace it - very common.

John, October 2009