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pressure?

my valiant combiboiler seemed to lose some pressure over a peroid of a month or so. when i top it to between 1.5 to 2.o bar, it will go down to about 1.o which i then top it up. I have search the system i cannot find any visible leak.
David CHU, May 2007
is your prv leaking, the copper overflow pipe that gos out through the wall to outside.

hi-spec plumbing, May 2007