Customer Questions and Answers for Thermal Fuse by Whirlpool

Steve, First check and make sure the power supply wires at the terminal block on the oven are properly seaterd and tight, a loose connection, could loose contact and the voltage could drop below minimum requirements. The next test would be to check the Control Power Transformer WP9760587 Using a multi meter, the primary winding (red wires) should have a resistance of 75 to 95 ohms,and the secondary winding (blue wires) should have a reading of less than 1 ohm. You also want to check the voltage, the red wires should have 120 VAC to the transformer primary winding and the blue wires should have 12 to 20 VDC out of the secondary windings to the control board (display circuit). The best test is when the display is blank, but power is supplied to the walloven. If the resistance checks and the voltages are correct, then you'll need the control board WPW10438751. The thermal switch, would not be the issue, it is designed to "open" and remain "open" in an overheat situation. The walloven would be inoperative and would not "reset" until the thermal fuse switch is repalced.