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..all the pipework look really dated, elbow joint from back room radiator underneath floorboard has been leaking for a while! Badly jointed and resting on concrete without any protection...was always told that lime in old concrete eats through copper??

...Yes it was a leak! Done everything you guys suggested and still had problem, it was the very last check I did before resorting to the self sealant! Lifted a floorboard at the very back of the house (old victorian house, was dreading finding the leak due to the network of pipe & floorboards...

Thanks for all your comments. (sorry..yes boiler is the ultracom). Expansion vessel was checked and that was ok. Will check water pressure sensor and h-exchanger and try the bag test tomorrow, will let you know how I got on. Thanks again guys!

Hi, We've had a 30cxi installed about 5months ago, it recently started to loose pressure and to add to the problem it seems to operate erratically cutting off at 0.9 bar when it should still be working until it drops to 0.4 bar. Glowworm engineer ran tests to the boiler and gave it the thumbs...