Ramon for Model Number PSS26SGRASS Replaced defrost heater (old was burnt), thermistor and top defrost thermostat several months ago. Seems to work fine for a little while. Then it started to behave erratically: couldn't set 0/37 temps,, it would go to Express Thaw by itself and could not stop that. Temps wouldn't go below around 15-20/45-50. Replaced MCB and erratic behavior solved, but still can't get temps below 15-25/45-50. Fans run well and heater OK (red hot) but big chunk of ice at freezer bottom; evaporator coil not covered with frost or ice when removed back panel. Cleaned out ice from freezer, but still can't get temps to 0/37. Can you help me? Ramon.
Answer Ramon, the temperature sensors WR55X10025 would need to be tested for resistance to identify if one or both has failed. With the power cord unplugged and the main control accessed, the sensors can be tested using the wires at connection J1. The freezer thermistor would be tested from the blue wire to the red with white stripe wire, the lower refrigerator thermistor from the blue wire to the yellow wire, and the upper refrigerator thermistor from the blue wire to the blue with red stripe wire. The freezer thermistor should measure 21K to 27K Ohms at the temperatures referenced and the refrigerator thermistors should measure between 10K to 12K Ohms. If the resistance of one is outside of the ranges provided, that specific thermistor has failed and can cause the cooling issue. Read More... Answered by AppliancePartsPros.com | Saturday, May 18, 2024