I have a statsman flowsure + oil combi boiler, the temp is hitting 90 and the pressure at about 3 bar or more. is this right? it seems a bit high to me. also it drips quite a lot out of the vent in the wall. the thermostat on the boiler is turned right down. we haven't got the heating on any more and its still spanking oil. any suggestions to what it could be?