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I don’t actually know where the bypass valve is from memory. I’ll have a look in the garage tomorrow as I assume that’s where it is. I thought whilst the heating is clicking on and off on a cold night like tonight though, that the system should be warm enough to not have the frost stat kick in...

Sorry guys, I’m not a plumber, yes I guess I should be referring to it as abv rather than prv.

thanks for that. I’ll talk to the installer and suggest what you’ve said.

Hi Ian, Why is that? Both 2 way valves are closed as the heating and hot water aren’t calling, so the prv allows the water to circulate back to the boiler as I understand it/was told by installer?

Hi Ian, Why is that? Both 2 way valves are closed as the heating and hot water aren’t calling, so the prv allows the water to circulate back to the boiler as I understand it/was told by installer?

I just timed it, 20 minutes between cycles, and heating has run between those two cycles...surely the pipes don’t cool down that quickly!

Good question Harry. I’ll have a think...

Hi Terry, the pipe stat is on the return, right close to the boiler. The frost stat doesn’t open either the htg valve or the HW, instead it deadheads the pump, lifting the prv. I can hear it, it’s a different noise to the hot water (quiet) and the heating (pipes expand in joists and can be...

Thanks Harry, I really don’t think it’s pump over run, I keep wondering if the pipe stat isn’t making good contact with the pipe, but then the counter argument to that is if it wasn’t then the frost protection would keep running and running! It’s the oddest thing. Thank you for your advice. Matt

Hi Harry, That did cross my mind, but the boiler manual actually says 25! I might give it a try though just to see. What I don’t get is that how can the pipe stat sees the heat from the frost protection cycle in about 1 minute, but cannot detect the hot pipe from when the central heating has...

Hi, thanks for your reply, it’s only been doing it since we’ve had the cold weather. I’m not an expert on this sort of thing, but I’m assuming the over run would only ever be straight after the heating has stopped? It can sometimes kick in 5 minutes after the heating has stopped, just for a...

Hi all, I have an oil fired boiler situated in the garage which is uninsulated. It has a Honeywell frost stat set to 4deg and pipe stat set to 20deg. In the cold weather we’re having it’s coming on for about 1 minute every so often as expected to do what it’s supposed to. There’s something I...