was the PO running biodiesel (a mix of petro and veggie oil) or pure veggie? I ask because if you run pure veggie oil it can "gel" in the lines, pump, injectors etc when it's below a certain temperature. There's not that much that can go wrong with an oil burner - if it's got compression - glowplugs and fuel it should run.
A filter change and good flush with regular pure petro diesel just may wake 'er up ....
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