THE PROBLEM I HAVE IS THE BOILER WILL NOT FIRE UP FOR MORE THAN A FEW SECONDS EITHER ON HOT WATER OR CENTRAL HEATING,IT THEN SPLUTTERS AND BANGS AND THE PRESSURE gauge RISES AND DROPS,IT THEN CUTS OUT AND I GET AN 02 CODE ON THE BOILER WHICH MEANS TEMPERATURE TO HOT. THE PRESSURE ON THE gauge IS READING 1.5 WHICH I THINK IS OK.ANY HELP WOULD BE GREATLY reicieved