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hi all my vailant boiler has been losing pressure at a steady rate (2 bar to empty in about 2-3 hours) for a few weeks now. i've had a boiler guy round and he said the boiler is fine, a plumber has been round and said there are no leaks at the rads, a leak detection guy round with his fancy toys...

I have a 4 year old vaillant turbomax boiler and today i have noticed that the hot water is very intermittent. ill get hot for a few mins and then its just cold water coming through,, central heating isnt that hot either. there are no errors on the boiler display, anyone got any ideas as to...