How do I fix the Pc Er code on Samsun Refrigerator model: RF28HFEDBSR?

Removing the power from the appliance is not recommended for this error. The problem is usually a bad connection at the board. I have seen kinked communication tapes as well as damaged wires at the wire connections for the doors.

The error may be related to a communications problem between the display panel and the main board. Check the connections to ensure they are soundly connected. If this doesn't solve the error then you may want to call a service tech. likely need a new display panel

If you have replaced both boards, checked the connections and wiring then you probably need to replace the door. The wiring that is inside the door is the next most likely cause. This is expensive though so you may want to get a technician out to try to confirm it. You can try to measure the resistance of each wire from the top of the hinge to behind the door control panel but it may not tell you anything. Partial wire breaks are tough to track down.

I had a similar problem and removing the ice maker reservoir in the door and replacing, reset my display. It has worked several times since.