hi there help please !!!! i've just replaced the expansion vessel on my boiler , topped up system to 1.25 bar and every time i use hot water or put central heating on the boiler standby light goes out after about 1 minute . i can reset the boiler almost straight away with the reset switch on top and the standby light re-illuminates. has anyone any ideas what the problem could be? could i have got air into the system? or not refilled the boiler correctly cheers holeinone
