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OK folks, the latest update having crawled around under the floors and found nothing, we took the boiler apart the heat exchanger was very corroded on one side, and the panel was soaked. The expert with us said it was caused by either condensation in the flue, or the flue leaking water...

thanks for the offer Paul, but I am going away this afternoon for some time (working abroad) I will have to shut the boiler down whilst I am away and try to get it fixed when I come back. I had hoped to be able to leave it on whilst I was away. thank you all for your help, very kind I...

yes, sorry, I seem to have hijacked his thread maybe some of the kind responses I have got have been useful for him too anyway, I was looking at my roof outlet and a lot of steam was being issued. Maybe more than normal, which would indicate a leak in the boiler combustion chamber after...

I had hopes I would get the help I needed here seems like my problem is one of those "unknowns"!

Well, I just did a proper check, turning off the boiler completely the pressure still drops fairly quickly does that mean a leak in the pipework? I really can't find one

oh dear Chris that sounds expensive! oh well....

It is a Vokera Linea 24, combi boiler It used to be a small pressure drop, now it drops more than 1.0 bar every day I think it drops only when used, so that prob means the leak is due to the heat efecting the leak I have ripped up as much flooring as I can and cannot see any leaks, I...

OK Paul, I did that as you can see above, no water coming out from there

OK I undid the pipe and it was totally dry after a couple of hours, the pressure had dropped about 0.2bar, and still no water so what next please?

yes, I can undo the outlet pipe the drain pipe goes down into the foundations, totally out of reach to check thanks Chris

thanks Paul but the boiler is on an internal wall, the pipes go down under the bathroom floor I will try to see if I can see where they go, maybe just into the ground would it be OK to undo the fitting at the boiler for the prv pipe? presumably the one with the red cap and 10mm...

OK there are 6 pipes from the left 2x 22mm pipes presumably the hot water heating in/out a 15mm pipe leading to a 10mm pipe with a red cap, possibly the prv a 15 mm with a yellow tap, probably the gas i/p a 15mm which gets hot when the water is run= hot water a 15mm pipe with...

I do not know wharere the PRV outlet is, sorry this is a Vokera Linea 24 boiler fitted in a bathroom cupboard where does the PRV come from so I can trace the pipe end? thanks

I have a similar problem I put in the leak sealer, and it worked for a while. Then it started leaking again the leak got worse It now loses pressure very quickly, from 1.5bar to 0.5 in a day or so BUT.. I cannot find any leaks, I have checked all the pipework how to solve? Can...