ignore the guy, he is one to talk, look back on old post and this guy was working illegally anyways, he just comes on here with clown like remarks all the time
whatever u do aqua dont fire up the boiler with the 'clear box' empty on water as products of combustion can enter the room :idea: hope u get it sorted
it will be the condensate pipe freezin up if it was bubbling like a kettle, get the hair dryer on it inside and hotwater on the outside, its the white plastic pipe which runs outside
give them a call and see if they have validated a registration and a serial number for u then jot it down if they have, they cust has a problem with it as u cant show ya card ask them to put ur details onto gas safe website for confirmation before u start the work