Hot water is fine and when we turn on the rads they srtrike up and stay hot, as you'd excpect. However, once the radiators go off the boiler loses all pressure and goes into F25.
It was all working fine before summer but then it started playing up in August after we returned from 2 weeks holiday (and we'd turned everything off while we were away).
Someone came out to look at it and made some minor adjustments. he said there wasn't much wrong with it and something had seized up so he'd sprayed some lubricant on it (sorry I can't be more expansive). He said he couldn't really find a fault with it.

Sinec then when we've gone to put the heating on we've started experiencing these problems.

Someone told us we should drain a bit of water out of the boiler. Does this make sense? And if so how do I do that?

Gower!, October 2010

Thanks Carefree. I wouldn't have a clue where to start with something like that. I'm sure it's been replaced recently though. In spite of engineers telling me that these are really good pieces of kit I think we've just got a duff boiler. Is there anything else it could possibly be or something I can do which could sort it?

Gower, October 2010

Yet another expansion vessel issue.

Carefree, October 2010