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I rather thought it must as it is a thermostat but it seemed a bit imprecise as my dial goes from min to max and with 1-6 I think in between. Compared with my HW tank stat and CH room stat which have precise temperature settings. Also, the dial feels a bit loose as if the rotating bit I can...

So does the boiler stat actually cut out the boiler when the CH flow temperature reaches a certain level? Does this apply to HW too? I do also have a HW cylinder stat set to about 55-60c. I did measure the surface temp of the radiators - it varies a bit but the best one got up to 64c. Too hot...

There is a frost stat in the garage but I am not even aware of what a pipe stat is. As Tony noted the weather has been very variable and we are due another cold spell this weekend. This past week has been more like +10c so the boiler has not had to work too hard and so no evidence of the...

True but on the coldest days the boiler has to supply heat for longer. While it could be -5c outside it will be well above zero in my garage where all the gas and CH components live (apart from programmer and room thermostat indoors). So it is not something else freezing up. But to be sure I...

As for general thermal efficiency of the house it is good but not great. Double glazed throughout. Loft insulated and boarded. Not sure exactly how thick but when done it was one standard thickness of the felt roll. The loft is very cold on cold days so it is not obvious heat is entering the...

Thanks all for the responses. I had not received any new email notification of responses to the thread and so had assumed there had been no further response. It sounds like I will have to ask my plumber to investigate but I would really need him to come out in a sustained cold spell. Even then...

No it is not a condensing boiler - which is what I guess most people have these days as I gather these were mandated in 2005. My Potterton predates this. So a lot of other threads seem to be for condensing boilers and offers up the condensate freeze as the problem

The boiler is a Potterton PrimaF. Sorry I don't have the product manual to hand to see if there is a more detailed reference but that is what it says on the front. The only user accessible controls are a numbered dial on the lower panel (presumably another thermostat but not sure what purpose...

There are hundreds of posts about boilers cutting out when they should be on but my problem seems fairly unique. I have a conventional boiler which works perfectly most days - until the weather turns abnormally cold. Then the boiler will simply go off and not come back on even though timer and...