Staff Answer
Sep 25, 2026 - 07:54 AM
The N611 is the base model. The letters after it (like RT) refer to options such as door hinge side and trim, so the main parts (boards, cooling unit, burner) are generally the same. For boards, the serial number matters more than the suffix. If your serial is below 9056491, you'd use the Power Board Kit 621991001. Above that, you'd use the 628661. The Optical Display Board 621988 you asked on has been discontinued by Norcold. The N611 is discontinued too, and Norcold's replacement is the Norcold N7X. See our Norcold replacement guide.
Since I can't confirm this 100% from here, please email us at info@rvfridgeguys.com or call 800-712-8822 with your model and serial number and we'll double-check it for you. You can also browse www.rvfridgeguys.com.
