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Hi Bengasman - Thanks for the reply. I actually did do a search and found various things. What I couldn't find was anything about the question I was asking.... i.e. Is it possible/not that the programmer is causing the problem. I think the programmer is a Drayton LP255, Boilers are...

Hi - I had this problem last summer. The programmer is not showing light to say it is on (or is not programmed to be on) yet the boilers (2 small joined into what I think is a pressurised/sealed system) bizarly come on by themselves! We had three lots of people in who changed thermostat...