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I think you are right mhs4771... the fridge control board is always 12V (either off the battery when boondocking or the converter when on shore power). The compressor unit heating unit to create the coldness is what is either controlled by propane or 110v, all of which is controlled by the control board running on 12v. I believe the furnace is only on 12v (and propane), no 110v needed.
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