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This is the weird thing - its not in an unheated room - its a boot room next to the kitchen, where we have an Aga that is always on, so pretty much the warmest room in the house - plus there is no pipe stat at all, hence the boiler firing but not turning off until the outside temp triggers the...

Cool - thanks... no evidence of a pipe stat at all in the system... which would explain the continuous firing of the boiler when the externally mounted frost stat kicks in. I've confirmed there are no external pipe runs, so I've disconnected the external stat & will let the Hive system's frost...

thanks folks.. the boiler is inside the house, all pipe runs are inside the house, and as far as I can tell there is no pipe stat anywhere in the system unless its deeply hidden somewhere... but I'm assuming it should be near the boiler on the CH return, and there is nothing that I can see...

HI, We've got a Danesmoor 20/25 oil boiler - looks like its got a frost protection stat attached which is overriding our main controller (hive) and causing the boiler to fire when not wanted. The frost stat is a Sunvic TLM2257, but the weird bit is that it's installed outside, in an IP56 rated...