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Nut tightened. Job done! Thanks for all the advice folks - much appreciated! Cheers, Mark.

Because I'd rather do it myself if at all possible. This is a DIY forum after all... :D :D

Nice one mate. Do I need to turn the water off or suchlike? I'm assuming water's gonna rush out when I undo that nut? Thanks for your help, Mark.

OK guys, I've found the leak! I thought there was a funny smell in the kitchen cupboard directly below the boiler so I emptied it and climbed inside and found this valve. This valve is between two pipes directly underneath the boiler: There is a fast drip coming from the connector...

I haven't used the heating since Monday evening. I can guarantee that after putting the pressure to 1 bar it will be at 0 bar after 12 hours!

Thanks for the replies guys. I haven't put that much water into the system since the engineer was here on Monday. If the expansion vessel is flat, could the water I've put in have filled the space normally filled with air? What I don't understand is why the old PRV opened when the AAV was...

Thanks for the reply. I'll explain more clearly what happened when the engineer visited on Monday. At first there was no water escaping from the PRV. There was water escaping from a vent/valve thing at the top right of the boiler which was then dripping out of the case. The part was about...

Just re-read the posts here! Could a flat expansion vessel be the cause of my problem? If so, would I be able to re-pressurise it myself? Could someone give me a few tips on this? Many thanks in advance, Mark.

Would turning the boiler to hot water only have the same effect? Or does that only disable the CH electronically? I'm losing approx. 0.5 bar every few hours so if it is a leak in the piping it's a pretty major one, beyond the Fernox sealer point I would have thought. Need to go into...

No, it WAS dripping from the bottom before the engineer fixed it yesterday, it's not dripping now though. He fixed the drip and replaced the pressure relief valve but still the pressure drops to zero. If it's gonna cost more than about £150 to fix then it's new boiler time!

It was dripping from the bottom of the case initially before it was fixed yesterday! The water was coming from a vent/valve at the top right of the boiler. The vent/valve was replaced yesterday. Looks like I'll have to call the engineers back tomorrow then.

Now that would be useful! Where will the isolation valve be?

I agree with that, in principle. However, I'd like to find out whether the problem is at the boiler-end or whether I have a leak in the piping first!

Well, got up this morning and the pressure on the boiler is again down to zero :( Story from yesterday: Engineer arrived, no water was coming out of the outside pipe from the pressure release valve opening, pipe was bone dry (even had cobwebs on it!). The engineer replaced two parts...

Yep, needed a new pressure release valve, Engineer managed to get one (the very last!) so problem now sorted.

Thanks for the reply guys. I'm going to phone an engineer today to have it looked at. It's the same engineer who has serviced it for the last few years so hopefully he'll know where to get some parts. Many thanks, Mark.

I have an ELM Leblanc combi gas boiler (approx 12 years old). After returning from a couple of days away I noticed that the pressure gauge was at zero. I topped it up to 1.5bar and switched on the heating. The heating runs fine, but the gauge just drops back to zero after topping up. I'm...