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I have the opposite problem. Pressure slowly dropping from 1.6ish to 0.4 over the course of a week. No obvious leaks. Signed up to a 6 month valiant service plan and engineer replaced a few bits including pressure release valve which I'm fairly sure wasn't sealing correctly as Airhead mentioned, but problem persists. Engineer coming out again next week but it's there any way I can check if the problem is in my pipes?
Polygon
hvsds
konastab01
friendly reminder to check your boiler pressure and bleed rads if needed.
only by chance spotted ours was at 3.4 bar when heating (max should be 3 bar for this one) - and was still about 2.5 bar when cold(ish).
fortunately was just a case of going around the house and letting the air out of a couple of the upstairs culprits - now back down to reading 1.3 bar cold.