Answer Dominic, There will be a thermistor in the freezer that you access by removing the control panel and the duct assembly from the refrigerator side that is for the temp in the freezer. The part number for the thermistor is WP2188819. The resistance of the thermistor in the unit should be 2.7K ohms at 77 degrees. If the themistor checks ok then the main control board would be the other thing for regulating temp in the freezer. Read More... Answered by AppliancePartsPros.com | Friday, January 13, 2017