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No nothing like that. And most of the rads are direct to the boiler over skirting that I installed. So can see all the pipework. It’s very strange.

I’ll do it over night and see what happens

Just check and pressure back down to near 0, last filled it up around 5.30. There is zero water anywhere, both overflows are dry as a bone too. At an absolute loss

I’m pretty sure we do as it’s not been used and ends up empty, I can double check this. Only things I haven’t replaced is the expansion, but again this let me pressurise it to 1.5 and the bottle trap. The boiler is just heating. It has 3 zones, but two have not been active the last few weeks...

Thanks. Where would it be leaking from the boiler. I have no water anywhere, same with the system. It’s really not making sense. Would a bottle valve trap inside the boiler that’s failed (not leaking water) cause any issues like this?

I don’t have one of those.

There are definitely no leaks from rads or from pipework. I can see all the pipework apart from a couple small sections, but by now there would be stacks of water.

I’ve got a central heating system that’s losing pressure. The expansion vessel was repressurised to 1.5 and held that pressure. I’ve replace the prv to a brand new one also. I’ve turned the boiler off and put the condensate into it and no water has come out. No water is coming out of the prv...