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Wonder if 12vdc power for furnace and water heater is coming from a single source and is not a good connection like a bad crimp or twist on connector. That sure would cause the control boards to freak out like you have been seeing.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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