Hi Tony,
Thanks for replying to my question. Yes your right it is 'Overheat', any suggestions?, there no Room thermostat in the house!. As you say most likely call an engineer to look, thanks again for your help.
Paul.
Novice here guys so go easy!, Today my boiler stopped working and on the LED's on the facia panel the red light is flashing indicating an 'override safety themostat'... any idea what this means?. the boiler wont fire up although the starter is clicking(trying to ignite). Any help would be...