Call an electrician, sounds like it requires replacement.
If there is a red light visible on the front of the burner then it is "locked out". Press the illuminated button(red light) with your finger and it should go off and you should hear the burner trying to start almost immediately.
If it locks out again, you have a problem. You say that there's plenty of oil, and that it hasn't run out recently?
Call a boiler serviceman.
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