OEM replacement upper/optical control board for Norcold N7 and N8 Polar series refrigerators — the front-facing user interface panel with buttons and status lights. Black. Previously known as Norcold part number 639550.
The Norcold 50856 is the OEM replacement optical control board for Norcold N7 and N8 Polar series refrigerators — the front-facing user interface panel containing the buttons and status lights used to power the refrigerator on/off, select operating mode, and monitor status. Previously known as Norcold part number 639550, this is the same direct-fit board under an updated part number.
This is the upper control board — distinct from the rear/lower power control board (639593) that handles the refrigerator's core power management. When the optical board fails, symptoms typically include unresponsive buttons, lights that don't illuminate or display incorrect status, or a refrigerator that won't power on from the front panel despite having power. Black color, fits a wide range of N7 and N8 Polar variants.
• 1x Norcold 50856 optical control board (black) Related N7/N8 Polar boards (sold separately): • 639593 — Rear/lower power control board • 633326 — Reigniter board
Norcold N7/N8 Polar refrigerators use two separate control boards: Optical/upper board (50856 — this item): The front-facing panel with buttons and lights. Handles user input and status display. If buttons don't respond or lights behave erratically, this board is the likely cause. Power/lower board (639593): Mounted at the rear of the unit. Manages core power functions, ignition, and cooling cycle control. If the refrigerator won't cool at all regardless of front panel input, the issue is more likely the power board. Confirm which board has failed by testing — a working optical board with a failed power board can still light up and respond to button presses, even if the refrigerator itself doesn't cool.
This board fits a wide range of N7/N8 Polar variants, but the suffix (V, X, LX, LXC, LXIM) matters for correct fitment. Check your refrigerator's model number on the interior label before ordering.