Boiler keeps losing pressure, overnight - no leaks on radiators or damp patches anywhere. Have noticed that water is dripping outside - from the pressure relief valve pipe when the heating is running.
What could be the cause of this?
I am having the same problem with my Alpha 28 boiler. I think the problem is a faulty pressure relief vale.
Peeks
February 2011
It's almost certainly a leak from one of the unions of the central heating pipes with the primary heat exchanger. The union is a real weak point, relying on a small o-ring seal and a bendy clip to hold them in place and seal watertight. The o-rings perish over time. They're simple enough to replace.
Olly
February 2011
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
