HI, HOPE YOU CAN HELP ME? WE HAVE A GLOWORM HIGH EFFICIENCY CONDENSING COMBINATION BOILER 30cx, GAS FEED 22mm PIPE, WATER 15mm SUPPLIED TO THE BOILER, CENTRAL HEATING WORKING FINE, !THE PROBLEM IS! WHEN WE TURN THE HOT WATER ON FULL THE DIGITAL DISPLAY (AS NORMAL) GO'S FROM 1.0 bar TO 30 DEGREE THEN...
