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I have a Norcold model N821FRT; serial #8035961. I replaced the circuit board after a repair person told me it was toast. Now instead of the "A" code on the fridge, I’m getting a "H" code - "This is a fault with the refrigerator controls". I noticed 2 black wires that have a tag that reads "120 VAC Heater". I don't remember seeing these wires plugged into the circuit board. Do they need to be plugged in in order for the reefer to work on AC? If so, where do they plug-in? Do you have a diagram or picture?