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Troubleshoot an ignition problem on a Lennox gas furnace

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Published on Nov 17, 2012

This furnace should light its pilot with a spark then the pilot proves its on and about a second later the main gas should light off. This unit turns on both the gas to the pilot and the main gas at the same time. This can cause explosions in the combustion chamber. The gas valve has stuck open and should be replaced.
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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