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A thermocouple is nothing more than temp. probe that sends info to the "brain" in your furnace.
When it acts up it gives the units controller bogus information , the problem my furnace had was it thought the fire on the burner failed to light so it shut the gas off ...even though the fire was burning as it should.
Turns out the thermocouple had shorted internally and was not sensing any heat ... no signal from the TC to tell it "successful ignition" so it shuts down.
Cheap and easy!
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