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Thanks.i had quick read over the expansion vessels ..my pressure is going down when the heating is turned as opposed to up : / ..

Also all the radiators are hot when the heating is on and the water pressure from the tap hot and cold seems ok.

Hello peeps after abit of advice about a possible boiler problem. The boiler is an evo he ??.i think there might be a leak somewhere in the system but im not sure as the boiler usually reads 1.2or so bar but when the central heating is on it drops to around 0.5. it needs to be re filled by...