Rick for Model Number W10503278 MY freezer keep's icing up it takes about two weeks for this to happen each time. I know the bi metal is good by testing with ohm meter. the defrost heater checks out. When i run the test through the control board it continues to tell me the bi metal is bad. I replaced it with a new one that i first tested in a glass of ice water and it checked out good. Could this just be a bad control board, or something else?
Answer Rick, Yes it could be a faulty WPW10503278 electronic control board, and probably is, based on the information you supplied. If you allow the refrigerator to run and cool for a day or so, You could unplug the refrigerator power cord, access the control board disconnect the J1 harness, from the board and check across wire no.1 and wire no. 5, If the thermostat is cold enough you should read a "closed" circuit on the RX1 setting on your meter. This will confirm the defrost components and wiring are in tact and you'll need the control board. Read More... Answered by AppliancePartsPros.com | Thursday, September 17, 2015