If the reset is tripped, then it is either not lighting or going out some time after it lights. I'd check the photo cell as Rusty suggests, make sure all connections are good (pull on wires that are in connectors (gently), they should not pull out of the connectors). Other problem could be air getting in the oil line, but the system would probably not restart if this were happening. If the photo eye is sooted up then the burner is not set correctly and needs to be adjusted. Obviously you've checked that you have enough oil in the tank.......
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