Oil burnerr reset trips occasionally
My oil burner control safety trips and cuts off the furnace about once a month. Resetting it by pushing the red button easily restarts the burner. There is a wisp of smoke expelled around the flame viewing cover plate so I assume that some oil was left in the combustion chamber from the previous failed start. Other than this problem, the furnace starts and runs smoothly. I suspect an electrical problem, but I don't have a furnace repair experience to suggest a specific problem. Can someone suggest a probable reason for this behavior?