Replacing a MCB1 with a MCB2?

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Replacing a MCB1 with a MCB2?

My Norcold fridge will work on AC at first but eventually switches to gas (anywhere from a few minutes up until several hours). I tried replacing the MCB1 (PN 638189) with the MCB2 (PN 638190) but with this MCB neither AC or gas works. So I am wondering if you know why and will your replacement MCB really work for me?

Status: Open Sep 24, 2026 - 09:54 PM

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Sep 24, 2026 - 09:53 PM

I'm not sure what MCB1 and MCB2 refer to on your fridge, and I don't want to guess. If you're replacing the power board on a Polar N7/ N8/ N10, the current board is the 639593/ 50861. Send us your model, serial number, and the numbers from your current board. 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.

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Norcold Power Board 639593/ 50861 (fits the Polar N7, N8, N10 models)

Norcold Power Circuit Board 639593/ 638189/ 50861*fits the N7/ NA7/ N8/ NA8/ N10/ NA10 models IN STOCK READY TO SHIP WITHIN THE U.S. Today! 639593 is the Norcold part number. The number 638189 appears as the p/n stamped onto the board cover itself. This is the rear power board/ circuit board th... See More

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Replacing a MCB1 with a MCB2?

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