Wish I could see more of the circuitry. I'm thinking that is an over temp protection device, a safety in case the fan quits circulating air sufficient to keep the unit from overheating and creating a fire hazard.
So when that failed, I take the heat quit and the fan continued to run?
If so, it most likely an over temp device. I would replace the heater and not try to repair or bypass it. Just for peace of mind.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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