Answer Ang, the thermistor W11438736 of the refrigerator would need to be tested for resistance. It should measure 2.7K Ohms at 77°F, 7.6K Ohms at 37°F, 8.8K Ohms at 32°F, 22.7K Ohms at 0°F, and 37K Ohms at -15°F. If the thermistor does not measure within 10% of resistance in comparison to the temperature it is exposed to, it would need to be replaced. If it does measure within the tolerance, the main control WPW10643378 would be the likely cause of failure. Read More... Answered by AppliancePartsPros.com | Tuesday, January 24, 2023