Why does the gas furnace short cycle

When the gas furnace short cycles, and it does not bring the structure up to temperature, I give several reasons why and how to fix them.
This video is part of the gas furnace series of training videos made to accompany my website: www.grayfurnaceman.com 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 and fuels used can be lethal and can cause a fire or explosion. Know your limits.

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