Customer Questions and Answers for Oven Thermal Fuse by Whirlpool

David, it would be recommended that the damper control assembly WPW10196393 is inspected to identify if it is open or closed. If it is open, then the air return ducts will need to be inspected to identify if they are blocked up (clear as necessary). If they are not blocked up, then the freezer evaporator will need to be inspected for a partial defrost. If there is a thick blanket of ice built up on the top of the evaporator, this would indicate a partial defrost issue. A partial defrost would normally be caused by the defrost thermostat W11260592 opening up too soon. If the damper is not open, the user control will need to be put into a service test mode and set into service test 6. This will cause the unit to open and close the damper. If the damper opens and closes, the next step would be to test the refrigerator thermistor for resistance. The thermistor W11478401 should measure 10KO at 77°F, 29.5KO at 36°F, and 86.3KO at 0°F. If these items all test within tolerance, then the main control WPW10503278 has failed and would need to be replaced.