Another thing to check is what the BURNER manufacturer calls for the oil pump pressure for your specific burner. And have the tech check the screen just before the pump on the burner itself. I had issues before with pump pressure being adjusted incorrectly (too low) by a technician. The new high efficiency burners call for significantly higher pump pressures. Could have been mistakenly adjusted incorrectly at the annual cleaning or the screen not changed. Just some other ideas.
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