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We have established there's a leak somewhere in the piping, our Vaillant loses pressure over a 48hour period. We've had leak sealer in and it solved the problem for 5 days. We've changed a radiator with a rusty valve connection. No joy Problem is, there are no obvious damp patches showing on...

Thanks gas4you Yes, you have ht the nail on the head. As a lay person, all I see is a boiler that loses pressure. i think I'm resigned to it being a leak now though! Problem is, the leak doesn't show anywhere. We had one radiator replaced as the connections were corroded. Still no joy. No...

simond. To a lay person, the only change to the system has been what has been replaced ie the boiler and valves. I think gasguru has made some suggestions above that tells me what you're getting at.

Thanks, yes obviously not a combi! the tank was in the roof No they didn't explain the pitfalls of my reckless purchase! They have suggested dumping a liquid sealant in the system that may plug any leaks. It sounds as if this may help. Thanks, i'm a bit closer to understanding why it's all...

We just replaced our boiler with a Vaillant ECOTEC and two months on it's driving us mad! The pressure regularly drops to zero after 36 hours and fails with an F22, leaving us having to manually build it back up. There are violent bubbles and sloshes when it kicks in in the morning from cold...