re-starting oil boiler myson velaire 70/90 class v?

the boiler ran out of oil 3days ago i have since had the tank filled 500lts, and was told to take the front panel off the boiler and press the re-set button then turn on boiler, --the boiler makes all the right noises as if its going to light up but then fails yellow light comes on after each attempt -- will try anything as we are freezing..