So every year I would have a technician come out and service our furnace. I'm not sure what all it entails to service our furnace, aside from changing the filter, but last year I learned quite a bit about our furnace when I replaced the circuit board, inducer blower, and then the pressure switches. (full post here: Furnace keeps going into lockout)

Seems like after all that, servicing my furnace myself shouldn't be too bad. I took a look at some lists posted on different sites that detail everything that's done, such as this one: https://columbiahvac.net/tune-up

  • Blower – inspect assembly (?)
  • Clean or change filter (?)
  • Verify limit operations (?)
  • Measure and record delta T (?)
  • Clean flame sensor
  • Clean and cycle condensate pump (90% or better EF) (?)
  • Measure and record amp draw to blower (?)
  • Measure and record amp draw inducer (?)
  • Inspect flue pipe
  • Measure and verify ignition protocols (?)
  • Clean burners (?)
  • Tighten electrical connections
  • Clean and adjust pilot assembly (?)
  • Clean exterior
  • Measure and adjust gas pressure (?)
  • Brush and inspect heat exchanger (?)
  • Conduct bubble test for gas leaks
  • Vacuum burner compartment

Most of these things I've done, the ones with a (?) are the tasks I'm unfamiliar with. Some of the things I wonder about doing myself, like measuring output and all that, but it seems like a lot of it would be pretty simple.

Can anyone give guidance here? Or recommend any good online resources in particular that would be good to follow when self servicing a furnace?


  • 3
    Jeez, I just turn mine on. If the air gets warm, it's good to go. Dec 7, 2021 at 5:36
  • 1
    Do you have all the tools to do this like the pressure gauge?
    – Solar Mike
    Dec 7, 2021 at 10:05
  • 1
    Most of those (?) will be easy to do with the right equipment(some expensive) and knowledge of what to do. If a boo-boo is done, can look on youtube for house explosions for what might happen. A local college might have heating technician courses available.
    – crip659
    Dec 7, 2021 at 14:01
  • 1
    Depending on (1) your LAHJ and (2) the terms of your home insurance, having it done annually by a tech with a license to do so may be required, or may not be required. If you don't check ahead of time, you might only find out that your insurance required it when they refuse a claim becasue it wasn't done.
    – Ecnerwal
    Dec 7, 2021 at 15:39
  • 1
    So you replaced the circuit board, inducer blower, and pressure switches but have a question mark next to "Clean or change filter (?)"??? Anyways, look up YouTube videos for each of those procedures and you should be able to perform 90% of those tasks. Some stuff like "Measure and record amp draw to blower" will require a multimeter and a general understanding of your specific furnace's circuitry. There's no one-size-fits-all blog on the Internet for this stuff.
    – MonkeyZeus
    Dec 7, 2021 at 18:10


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