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How do you know if the thermo coupling on your gas furnace is bad?
Wiki User
∙ 14y ago
The thermocouple tells the gas valve to supply gas to the burners. If the thermocouple is bad then the furnace will not work or the pilot will not stay lit. A properly working one will have a reading of at least 12 milliamps.
Wiki User
∙ 14y ago
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