It is possible that it is airlocked. This sometimes happens on a single pipe system if you run completely out of oil. To remedy the problem you have to loosen the bleeder valve. It is usually locate by the oil line connection to the burner.most of them are shaped to allow connection of a small piece of tubing to direct the oil that will eventualy come out of it to a container . With the unit off, loosen the bleeder valve , then attach one end of the tubing to the valve and put the other end in a small container, turn the unit on .air,foam and bubbles should start to come out of the tubing. Run till a steady stream of oil is present. Shut unit back off, remove tubing and tighten valve, turn unit back on and unit should operate.
hope this helps
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