Boiler lock out?

I have the same problem with a Trianco Eurostar 70/90. It is 6yrs old and we resited it 4 years ago. After it was resited we have had continuous problems with locking out. We have had 4 engineers look at it and it seems a bit better when it takes air from the room rather than outside. That said we are having problems again this winter and we are now considering changing the boiler! Seems a bit drastic so thought would check the internet beforehand and possibly call the manufacturer. All I can think with our boiler is that it doesn't like its new location as the flue faces the oncoming wind. We had no problem before when it faced north. (we live on top of a hill by the way). If you do get any joy then would be pleased to hear from you and vice versa.

Don
October 2008