Always check the obvious first, is the gas on at the meter?
Flashing red light means the gas is not igniting, can you hear the fan running inside the boiler?
http://www.astonheating.com
b]I bought one of these drills 2 weeks ago and have used it to install a kitchen and some over work. The drill performs well but the batterys go flat each day.they are probably not powerful enough.[/b] size=18][/size]