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why is my overflow pipe leaking on combi boiler?

the overflow pipe is leaking on my combi boiler presure is at 1 bar can i fix it myself if not how much will it cost
steve, April 2009
Check filling control knob not leaking by
if the pressure is not droping on gauge and filling loop closed and leaking means something is not right.
your gauge may be misreading. if pressure is leaking than gauge must be droping could be anything. presure valve can be replaced with plumbing knowledge if you know how

Mr K, April 2009