The combination gas valve explained

Disassembly of the combination gas valve. The control is compared to the gas chain control illustrated on an earlier video. This valve is used in many gas appliances. I show how the thermocouple works and how it is used to keep the unit from running without a pilot flame. I also discuss the regulator and how to adjust it. 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.