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A thermocouple is a safety used in ancient design systems that our beloved mother ship continues to sell.
it is aN old invention that has 2 dissimilar metals that when heated by the pilot flame generates a small amount of voltage that tells the main gas valve it is ok to open.
You do not find them on modern heating systems, they use control boards to confirm flame operation and the t/c is a relic from the past.
Really, time to move on a/s. I still feel an all electric unit with inverters and a small built in generator/fuel tank would be the way to go. No propane, after 30 years in the HVAC equipment business, I have seen my share of disasters with the stuff most in the industry call NASTY!!!
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