How do I know if furnace thermocouple is bad?
FWIW, the function of a thermocouple is to keep the safety portion of
the gas valve open on systems with standing pilots. Does your unit have
a pilot? There were some units that were available with standing pilots
12 years ago, but they were already getting pretty rare even then. If
you do not have a pilot, I kinda doubt they replaced the thermocouple.
Larry
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