[quote="htg engineer"]What's the make and model of boiler.
There's not many back boilers with opverheat stats. If the pilot keeps going oput it's more likely to be the thermocouple at fault or the pilot may need cleaning.
Thanks for the reply
It is a baxi bermuda inset for which we had to have an overheat stat fitted when we went to the pressurised system for our new megaflo hot water tank. (which incidentally we squeezed into the loft to free up some bedroom space) The pump is also now in the loft.
I have bought a new stat as specified by baxi as an experiment to see if it is that which is at fault. ( I will find a corgi engineer to fit it).
Also having now read various reasons why the overheat stat will kick in I am wondering if the problem is the pump, as we are asking it to pull water up approx 5m. I suspect it is struggling, the water is moving slowly and then is 'overheating'?
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