Candy G Wrightwood , CA July 24, 2016 Appliance: Frigidaire Refrigerator FGHC2331PF0 Frigidaire Refrigerator Fghc2331pf0 / : Error code sys ef was displayed but the evapoator fan tested good. How to replace Pcb Main Power Control Board Assembly. We replaced the controller board and installed a surge protctor. The challenge was accessing the board It was underneath the refrigerator. We tipped the appliance and placed a couple of 2 x 4 pieces under the front edge. 7 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes