When the furnace will not light, the thermocouple may be the problem. I warm a thermocouple and check how the pilot safety is held on when the pilot is on. I also check the time it takes to drop out the pilot safety when the pilot goes out. This video is part of the pilot gas furnace playlist.
This video is part of the heating and cooling series of training videos made to accompany my websites: www.graycoolingman.com and 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 can be lethal, the fuels are highly flammable and high pressures are used. Know your limits.

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