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York gas furnace pilot lights and begins heat cycle but burner quickly goes out and system continues to run blowing cold air

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There is a flame sensor that holds the gas valve open when there is a flame present. Heat generates about 10 to 15 milivolts to do this. Make sure the side of the flame is touching the sensor. If it looks ok Tighten the fitting that holds the sensor to the gas valve. If it still won't stay lit after all that then replace the sensor. They do fail with time.

Posted on Mar 30, 2015

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