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Hi i had an engineer come out to diagnose a fault with my boiler which we thought was the 3 port valve not working, but was diagnosed to be the room stat not calling for the heating. on the advice of engineer he said change the stat as its cheap than them doing it at a cost of £140 I just...

Hi I'm after a bit of advice, I have a Logic heat 12 boiler with a Hortsman centaurplus 27 programmer and a Danfoss HSA3 motorized valve. with a Newlec room stat. I'm not sure if something has gone wrong with it? I have both Heating & Hot water. when i turn the room stat down the radiators are...