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In my experiences with this same issue your thermocoupler has gone bad. I had this same thing happen to me a few years ago, only my heater would work for a day or two and then go out. I tried several other things thinking that it was a different problem. As soon as I replaced the thermocoupler it solved the problem. I haven't had the problem since then. My heater was a different brand and about a year old as well.
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