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Hi Alec (Im also in wales). I think I see rough idea of what you mean, but having to turn off whole thing, & on again like I'll be doing tmrw 8 am freezing my nuts off (2*c now.. so a v.cold night in store again).. i have to also press 'reset' button on this wretched unit to fire it up again...

Hi on here. This is my 1st post: I was googling a temperature sensor, & came upon this site which looks very good. Ok I wonder if folks could help. I have a 7 month dreadful central heating problem from a new ashp split (Vaillant arotherm). My problem is simple, but the solution anything but it...