HI ALL, I HAVE A GLOW WORM 50FF MICRON BOILER WITH PROBLEMS, WHEN I TURN ON THE HEATING, THE BOILER WILL FIRE UP FOR ABOUT AN HOUR THEN CUT OUT AND I HAVE TO RESET IT BUT IT WONT FIRE UP AGAIN UNTIL IT HAS COOLED DOWN, THE RADIATORS GET HOT BUT THEN COOL DOWN TOO, WHAT COULD BE THE PROBLEM IF ANYONE CAN HELP I WOULD APPRCIATE IT BECAUSE I,M FREEZING AT THE MINUTE, MANY THANKS ...................CARL