Tip & How-To about Heating & Cooling
If the burners of your furnace light and go out after approximately 5 seconds, the problem is most likely with the Flame Sensor. The Flame Sensor will develop a light coating that will prevent it from sending a "proof" signal back to the main board. If the main board does not receive this "proof" signal, it will shut off the gas valve. After 3 attempts, it will lock out leaving only the draft inducer motor running. Here is a video demonstrating how to identify and clean the flame sensor to get your furnace back to running normally in only a few minutes.
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