While I was in the HVAC supply business, I was never in the installation or maintenance end.
My question is about annual maintenance items on an oil fired furnace that is 3 years old.
I change the fuel filter every year before the heating season plus the air filters on a regular basis throughout the season. Other than changing the burner nozzle and adjusting the electrodes as needed, what else should I be doing? I can't see anywhere on the furnace itself that would need cleaning. And at what frequency should I be changing the nozzle - if it needs changed at all?
I hesitate to call the local plubing outfit (who installed the furnace) as I am sure they will whack me at least $125 for what I am doing already.