David V Churchville , NY November 29, 2014 Appliance: Frigidaire Refrigerator FGHS2667KB0 Frigidaire Refrigerator Fghs2667kb0: Door display error "sy ce". How to replace Refrigerator Main Control Board. I ordered 2 circuit boards, Main board (under fridge) and door circuit board. Either one could have been the reason for the communications error. Didn't want to take a chance and order the wrong one and wait a week for a different board. The problem was the main board. I will keep the door board as a spare. The replacement board was not identical to the original so there were adapter cables that had to be installed. A little tight fitting into the original box but it worked. 17 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes