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Many thanks, I'll go back to the programmer and stat

The problem is recent

The system is full and the pressure is ok. I was pointing out that with the programmer off and room stat off, the boiler is on even though I'm not calling for heat but if I'm understanding correctly I've got the frost stat calling for heat because I've linked it out. If I remove the link and...

That last post was misleading about some rads being cold, my grandson's been playing with the TRVz!

More info: At the moment, the frost stat is shorted so the gas burner is on, pump is running, programmer is off, room stat is off. Only some rads are hot and others are stone cold. Very confusing

No, it's been in 5 years

In tracing an electrical fault in my heating system, I've found that it only works when I short out the frost stat. Presumably, the frost stat should only close in extremely low temps and this is what I'm simulating. Of course, the system is then on even if the programmer is set to off. When...