My sime (format 80) turns off all the time with a green lcd light that comes on to indictate low pressure in the ch system but gauge shows i have 1.2 bar pessure in system .From the first day we have had this which is two years old we have had every thing go wrong .Having the boiler in the underdrawing ,can this have an effect on the switch/sensors eg low pressure switch to cut out all the time ,then leaving for half an hour to reset itself to go back to normal (underdrawing ,under house )therefore cold,If the cold affects this will i have to give my boiler a blanket to keep warm Ha!