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That's what I was coming across in my research. The thermo coupler, but I had ruled it out, because wouldn't it make the pilot go out?

This is the first light of the season in a new house.
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I've got an older Williams model Propane furnace (model # 450sfa-2) controlled by a Lux 1500 Thermostat, and I've tried everything I can think of. The Pilot lights and stays lit, but the burners will...