Whirlpool Dual Infinite Switch (W10434452)

The Whirlpool Dual Infinite Switch controls heat output to two surface heating elements on an electric cooktop. It varies power to each element by cycling the element on and off at set intervals, allowing you to adjust from low simmer to high heat. It also routes power through the proper terminals for each element size and provides an OFF position that stops power to the elements. Common failures come from worn internal contacts, heat damage from arcing, or a loose or overheated wire connection at the terminal block. Moisture, spills, or long-term high-heat use can speed up contact wear. When the switch fails, it may not regulate power correctly or may not open the circuit when turned off. These symptoms can help you decide if this switch matches the issue you are seeing: One or both surface elements will not heat even though power is present and the element tests good Element heats only on high or only on low, with no smooth change across settings Heat cycles irregularly, causing wide temperature swings during cooking Surface element stays on when the knob is set to OFF Knob feels loose, binds, or turns without changing heat output Burning smell, discoloration, or melted terminals near the switch