I recently moved my oil filter in line from one wall to another, allowed air to to get into the line, then bled the line. The oil flows freely at the burner now, disproving air contamination. The burner is not igniting now.
My house was built in the early 50's, and the Timken oil furnace is model # OFD-75. It won't ignite. What can I do to troubleshoot before calling a tech to service?