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That's an idea, especially since I reckon you might have a point about the top radiator acting as an expansion vessel until I bled it. I'll go looking for the system drain valve this afternoon.

Thanks very much both posters above for useful advice. I can't see the schrader valve so am assuming it's behind the front panel, and I don't think I'm competent to go removing that so will contact the engineer a.s.a.p.. Meanwhile, I don't think I can avoid using the system altogether as...

Starting to sound that way, isn't it? I've ten thumbs and am not confident with DIY work but I'll try and check the expansion vessel myself and see if it's working. Either way, I'll phone the firm who serviced it in the morning and request that the engineer takes a look when he does the...

That makes sense. That said, would I be right in thinking the engineer would have checked the expansion vessel when he serviced the boiler?

No, the problem started when I bled a radiator yesterday. I now wish I hadn't! :mrgreen:

My first post here, and I could do with some advice re. the central heating system in the house I bought a few months ago. Basically, what seems to be happening is that the central heating is losing pressure when turned off, but when I let a bit more water in and run it, it goes over maximum...