Frequently Asked Questions
•How do I access the main control board (MCU) on my Maytag refrigerator?
The MCU is typically located behind an access panel on the back of the refrigerator. You will need to unplug the unit, remove the panel screws (often using a 1/4-inch nut driver), and carefully remove the panel to expose the control board.
•What voltage should I expect to see at the MCU?
You should measure 120V AC at the line voltage input terminals of the MCU. Refer to the wiring diagram (usually located inside the access panel) to identify the correct terminals.
•If the outlet is supplying power, and the wiring looks good, what else could cause the PO error?
If the outlet is confirmed good and wiring is secure, a failing main control board (MCU) is the most likely cause. The MCU may not be properly processing the voltage signal or may have internal component failure.