Jerry for Model Number Bosch B22CS30SNS/01 side by side The freezer seems to be working fine, but the refrigerator is warm in the 50's F, thereby causing some food to spoil. This fridge has separate evaporators in the freezer and refrigerator compartments. Is it caused by a temperature sensor going bad in the refrigerator side, or something wrong with the defrost process, or faulty control board? This problem happened gradually over a few weeks I think. I opened the cover on the refrigerator side. The evaporator fins forms a thin frost after a cold start after about 15 mins. But the frost quickly disappeared soon after and turned into water. When frosted, the evaporator tubes temperature dropped below 30's F. As soon as the frost disappeared, the temperature climbed up to 50's F (on both the evaporator tubes and defrost heater tube). This brief frosting and longer defrosting process seems to repeat itself. I did not notice that the defroster tube was hotter than the evaporator tubes or it warmed up first. Granted that the defrost tubes fit snuggly on the outside fins of the evaporator.
Answer Jerry, Test the defrost thermistor [00612240] for a resistance of 5K ohms at room temp of 77 degrees. If the resistance is off by more than 10% then the thermistor is faulty and would need to be replaced. If the thermistor is good then it sounds like the control board is sending the refrigerator section into defrost too often and the control board would need to be replaced. Read More... Answered by AppliancePartsPros.com | Wednesday, August 10, 2022