And the answer is . . .
I got the furnace cleaned and serviced today. The cause of the smoke smell was that the flue pipe was a bit corroded. The technician wrapped silver tape around it and said it will last until spring.
Regarding what I was calling a "screen," y'all were right. There was no screen. It was just the clean-out panel on the side of the boiler.
The technician's theory about the short cycling was cold oil or a downdraft during that really cold weather creating a firing delay. The flue is not blocked; draft measured good today.
Last edited by SailinAway; 01-18-2022 at 07:42 PM.
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