I have a Lennox 023Q3-105/120-2A oil furnace.... the tech guy will be coming soon to service it and replace the nozzles (it has .65 70B in there now, even though the spec calls for an 80deg nozzle?) and replace fuel filters and such..
Last year, the tech was unable to remove a couple of the caps on the inspection ports, and so was unable to see/clean the whole thing. I decided to remove the caps myself ahead of time, so he could get all the stuff done.
There's a lot of corrosion in there, and on the left side the curved wall that is visible at the end of the pipe is perforated.
Is this the heat exchanger? Does that perforation and corrosion mean the entire furnace needs to be replaced? There are actually two furnaces... identical pair, upstairs/downstairs.
There is a lot of corrosion/drippings on the burner unit, as you can see in the photo, and it appears this is coming from condensation inside the flue pipe. Is this normal, and/or is there a way to prevent it?
I'm not looking to DIY this, but i'm aware enough of things mechanical that i want to understand the situation and issues fully.