I have a Grants Vortex 15/26 Condensing Boiler newly installed as well as a new oil tank installed. After filling the tank I ran out of oil as my reading within my new property still had a digital read out of half full (obviously not working properly) Once I re-filled the tank I tried to start the boiler using the lock-out button but it wasn't kicking in. I have since tried to bleed the system of any air (removing arounf 2 litres of oil) but the boiler will still not kick in. Anyone any ideas - can't get a plumber for love nor money !!