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Either the control board has an issue or the 120vac heater has failed. If you have an ohmeter, you can unplug the heater and take a reading. If the heater is open, it is a no brainer, but it may have just degraded so that it's not recognizable by the control board. They aren't fun to replace given the tight area it fits in on the heater tower assembly.
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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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