Large Burner Infinite Switch for Kenmore 790.26999103 – What Fits and How to Replace It

Understanding the Problem

What this part is and why it matters: The infinite switch (surface burner control) is the rotary switch behind each knob on an electric range that controls heat level for a given surface element. For Kenmore model 790.26999103, a failed large-burner infinite switch will produce symptoms like a burner that won’t heat, won’t go above low, or is stuck on a single power level. Step-by-step diagnosis and repair (practical): 1) Confirm the symptom: Note whether the problem is limited to the large burner only, or affects multiple burners. If multiple burners fail, suspect harness, terminal block, or the main power feed instead of a single infinite switch. 2) Visual inspection: Unplug the range or switch off the circuit breaker. Remove the burner knob and the rear console or control panel trim to expose the back of the control switch. Look for burnt terminals, melted plastic, or loose wires. 3) Test the surface element: With power off, disconnect the element wires at the element and check element continuity with a multimeter. If the element is open, replace the element first—don’t replace the switch if the element is bad. 4) Test the infinite switch electrically: With power off and wires accessible, check the infinite switch for continuity between the common terminal and the heat-level terminals in multiple knob positions. A properly working infinite switch will show changing continuity/resistance as you turn the knob. If a position shows no continuity when it should, or if continuity never changes, the switch is bad. 5) Inspect wiring & terminal block: Sometimes a loose/chipped terminal or burnt terminal block causes the same symptoms. Tighten or replace the terminal block if needed. 6) Order the correct replacement: The exact replacement depends on the switch’s mounting flange, shaft style (smooth vs. D-shaft), terminal layout, and whether it’s a 3- or 4-terminal switch. Common compatible replacements used on many Kenmore/Whirlpool-built ranges include large-burner infinite switches sold as “infinite switch for surface element (large)”; verify by matching the old switch’s part number and terminal layout before ordering. 7) Replace the switch (how to fix): a. Power off the range at the breaker and verify with a non-contact tester. b. Remove knobs and control panel access as needed to reach the back of the switch. c. Photograph or label each wire to ensure correct reconnection. d. Pull wires off the old switch terminals (use needle-nose pliers). Remove mounting screws and remove the switch. e. Install the new switch in the same orientation and secure with mounting screws. f. Reconnect wires exactly as labeled/photoed, replace panel and knobs. g. Restore power and test the burner in multiple heat settings. Safety note: Always disconnect power at the breaker (not just the range power switch) before testing or replacing internal parts. If you are uncomfortable working with live voltage or can’t confirm wiring, call a qualified technician.

Common Symptoms

Large burner doesn’t heat at any setting, only heats on one or two settings, stuck on high or low, sizzling smell or visible burn damage at switch terminals, intermittent heating.

Common Causes

• Failed infinite (rotary) switch due to worn contacts or internal burn
• Burned or loose wiring/terminal block causing interrupted power to the element
• Open or shorted surface element (may mimic a bad switch)

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Frequently Asked Questions