Norcold 1200 Muffin Fans

IF on a recall install they remove the rear black module board to install the recall kit wires, IF they reverse the White and Black fan/flapper wires, the rear fans will NOT work. If the outside temp is over 70 degrees and the refer has been running at least 12 hours, just reverse those 2 wires (They have a large white an small white wire together, and a large black and small black together). If the fans come on in a few seconds they reversed those wires, so leave them in the new position. This is a common complaint/problem when someone removes the black module board cover. They do not know which wires go where and since nothing bad happens when they misconnect, they figure they connect correctly. Staring at the back of the module board, the White wires will be to the left and the Black wires to the right of the white. There is no other way to diag the fans without pulling the refer, unless the refer is in a slide room with a upper access door. Doug