When the gas burner in your furnace does not turn on or your pilot light in an older furnace is out, you may find that the problem lies in a little device that controls the gas valve. In an older standing pilot furnace the device is called a thermocouple. In newer electronic furnaces it is called a flame sensor. However they both perform the same basic function, and that is to control gas flow.
In the tutorial Replacing a Furnace Thermocouple or Electronic Flame Sensor I describe how to easily replace a furnace thermocouple in an older style standing pilot furnace or an electronic flame sensor in a newer style electronic ignition furnace.
Of course determining if the thermocouple or flame sensor is your problem is something you need to do. I outline how to troubleshoot a standard furnace in Troubleshooting a Gas Furnace and how to troubleshoot an electronic furnace in Troubleshooting an Electronic Furnace.
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