How to service the 80% AFUE gas furnace, check blower, clean burners and check heat exchanger Part 6

A description of the method of checking the condition of the blower and bearings and cleaning the burners.
This video is part of the heating and cooling series of training videos made to accompany my websites: and to pass on what I have learned in many years of service and repair. If you have suggestions or comments they are welcome.
If you are a homeowner looking to repair your own appliance, understand that the voltages can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.

18 Replies to “How to service the 80% AFUE gas furnace, check blower, clean burners and check heat exchanger Part 6”

  1. One burner was not lighting, so it would shut down and show a code 7….We cleaned the orifice of one burner, it ignited and the furnace stayed on and codes stopped flashing……Thank you for the heat on a cold rainy day….

  2. wow , i have never seen a rubber gas line on a furnace! that makes getting to the burners easy. every furnace ive seen is hard piped and takes quite a bit of work to get to the burners.

  3. Yes. I have done that. It does not mean that if you do not find a missing ring or crack that there is none. Further checking may be necessary. Hope this helps.

  4. My comment is for the gentlemen who made this video is the furnace that you inspect on the video is possible to inspect the heat exchanger by taking off the high limit sensor who is the black square who is connected to two red wire when is taken off you look inside and notive if you see ring in the middle if you dont see the rings its possible that they are missing and need to change the furnace because its a sign of missing components on the heat exchanger that will consider that is crack!

  5. GFM, Thanks for sharing your years of practical knowledge with us. Your videos gave me the confidence to repair a primary limit failure on my Goodman 80% furnace and avoid a service call on a weekend. You have a heart for teaching.

  6. @grayfurnaceman Thanks! I'm glad you enjoy them. I recently posted 3 new videos. I'll have more up soon!

  7. Got to keep your furnace tuned to top-notch operation! Could you do me a favor an check out my channel? Thank you!

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