we had a brand new boiler fitted about a year ago and upto a couple of months ago it was fine but since then it seems to have a lot of air swishing thru the pump, I keep bleading the system but it just keeps comming back. I had a casual chat with a plumber at work he said there must be a leak but there is defiantly no leak any where, he then said it must be over run (what is this? and how would you fix it) are there any other suggestions as to what it may be .
cheers
toupo.
cheers
toupo.
