- New
50856 by Norcold is an optical control board designed as a replacement component for select Norcold RV refrigerators. It provides the refrigerator’s user-interface and indicator functions, supporting operation and status monitoring. This part is associated with Norcold part number 639550 and is listed for select N7 and N8 series models. Compatibility can vary according to the exact refrigerator model and suffix, so confirm the appliance identification label and existing board number before ordering.