Norcold 640178 Rear Compressor Power Module for DC RV Refrigerators

Norcold 640178 is the rear compressor power module for specified Norcold DC-compressor refrigerators. Thetford/Norcold factory parts lists identify this component as the compressor power or control module, distinct from the interior user-display circuit board and condenser fan.

Manufacturer-documented applications

• N8DC and N10DC: N8DCSS, N8DCBSS, N8DCBK, N10DCSS, N10DCBSS and N10DCBK in the factory N8DC/N10DC rear-cabinet parts list.
• N15DC: N15DCSS, N15DCIMSS, N15DCMB and N15DCIMMB in the August 2025 N15DC/N20DC parts list.
• N20DC: applicable N20DCSS, N20DCIMSS, N20DCMB and N20DCIMMB refrigerators with serial number SE185ACDW01540086 or earlier.
• N2090: part 640178 is the power control module, item 3, in the June 2025 factory parts list.
• N2152 and N2175: part 640178 appears in their model-specific factory parts lists, subject to the serial and production changes below.

Important N20DC and N2175 serial warning

For N20DC units with serial SE185ACDW01540087 and later, the August 2025 Norcold parts list identifies 641548 as the compressor power module instead. The August 2025 N2175 parts list also mentions both 640178 and 641548 but prints overlapping serial-range wording; that N2175 cutoff is not sufficiently clear to publish as a definitive interchange rule. Have Norcold or the parts supplier confirm the correct module for the exact N2175 serial number.

Before ordering

Check the refrigerator model and serial label, original module markings, electrical connectors and appropriate illustrated parts list. This listing covers the compressor module, not the complete refrigerator, display control board or fan. Disconnect power and follow the manufacturer's service instructions for electrical repairs.