Crescentbay for Model Number ZISS420DRISS I normally the digital temperature control set at 0 for the freezer and 37 for the refrigerator. However, now the unit get much too cold, the freezer going into minus range, while the fridge freezes. By raising the freezer to about 3, I can keep the fridge to about 37 as a stopgap but bottom line the separate controls are not functioning properly. GE has already serviced this once in the past under warranty for the same problem. My recollection was that a circuit board was replaced. Of course, it's now out of warranty! Is this more likely a control board again or one or more of the thermistors?
Answer Crescent Bay, For the issue that you are having you will want to check the thermistors in the unit to make sure that they are within range. At 37 degrees the resistance should be approximately 14.4K ohms and at 0 degrees it should be 42.2K ohms. If outside of range then the issue is with the thermistors. If these check ok then the main control board would most likely be the issue. Read More... Answered by AppliancePartsPros.com | Thursday, September 25, 2014