David J Cape Coral , FL January 24, 2017 Appliance: LG Refrigerator LFX25975ST Lg Refrigerator Lfx25975st / Astclga: Error code er dh. How to replace Power Control Board Assembly. I first changed the defrost sensor with no result. Then I tested the heater element which tested okay (all according to the appliance pros) the only left to do was change the PCB which resolved the problem. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes