WORCESTER 24CDi RSF PROBLEM!!?

I HAVE GOT A WORCESTER 24CDi RSF, AND THE PRESSURE KEEPS FILLING WELL BEYOND 1.5bar WHICH I`M DROPPING BACK DOWN TO PRESSURE REGULARLY, THERE IS NO WATER GOING THROUGH THE FILLING LOOP, AND IT IS BLOWING OFF INTO A NICE BIG FROZEN PUDDLE DOWN THE SIDE OF THE HOUSE!! CAN ANYONE PLEASE ADVISE???