Set the thermostat 5 degrees above the room temperature. If it is a clock thermostat, make sure it is timed correctly.
Make sure that all switches affecting the oil burner are “ON”
This is on the burner control box which is usually located on the chimney stack, but may be on the burner itself. Caution If the burner runs for a minute or two and shuts off again, DO NOT PRESS THE RECYCLING BUTTON AGAIN.
Check for blown fuses in the meter box and main burner switch box. Replace blown fuses with a new (15 ampere capacity). Screw in tightly
If your boiler is equipped with a low water cut-off make sure that the water in the boiler gauge is at the “water line” (usually about half way up the glass) If the level is low, open the water feed valve until correct level is restored. Then close valve tightly.
(With hot water boiler, check thermometer) If the pressure or temperature is high, the limit control may have stopped the burner. If so burner should re-start when pressure or temperature drops.
Be sure there is oil in the tank and the oil line valve is open.