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I HAVE A SIME 'FRIENDLY' WALL MOUNTED BOILER, WHEN IT COMES ON IN THE MORNING THE PILOT LIGHT LIGHTS AND THE RADIATORS GET WARM AS EXPECTED.HOWEVER ABOUT FIVE MINS LATER THE PRESSURE GAUGE WHICH NORMALLY SITS AROUND 2 SHOOTS UP RIGHT PAST THE RED NEEDLE WHICH IS AT 2.5 AND GOES RIGHT UP TO...