Hi there, I have a problem with my Grant Vortex condensing oil boiler model 15-26. We ran out of oil last week (wife forgot to check - as usual)! the tank has now been filled. Now when I fire up the boiler, the red reset light is on - I have tried to reset it, it makes a whirring noise for about 10 secs and then it tries to kick in and after 2-3 secs switches itself off. I have spoken to my oil engineer (during the day - and now it's evening and i cannot get hold of him) and he told me that there's an air lock. I have removed the grub screw to release the air lock, but no hissing and the oil is there, but it doesn't gush out. Can anybody advise me???? I released the grub screw when the system was switched off...do I need the bolier on? Please advise.