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thanks for your advice regarding this subject tried testing the filling loop no problem their could anyone advise me on the best way to repressurize the expansion tank :)

I have POTTERTON PERFORMA 24 COMBINATION BOILER WHICH WAS FITTED 3 YEARS AGO. RECENTLY IVE NOTICED THE WATER PRESSURE NEEDLE START TO RISE. NORMALLY THE BOILER RUNS AT ABOUT 1.5 BAR BUT NOW CREEPS UP TO 2.5 AND BEYOND. I HAVE BEEN DRAINING SOME WATER OUT OF THE SYSTEM IN ORDER TO LOWER THE...