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Pilot light won't stay lit.

The pilot lights easily, the burner fires and burns for about 5 minutes and then everything shuts off including the pilot light. A service man has given up after replacing the pilot assembly and the high limit switch. Any suggestions...

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Most common cause of the described symptom overheating the thermocouple! a thermocouple produces millivolts of electricity based upon a differential of temperature between the tip and the base. If it gets too hot it will not work correctly. If the pilot flame is too large or the main burner flame is contacting the thermocouple or the thermocouple is too cheap or old all can cause this issue.

Posted on Dec 18, 2008

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