KitchenAid Stove Repair in Toronto — Surface element stuck on high

• A surface coil or radiant zone that stays on full power with the knob turned to LOW or OFF is the infinite (surface element control) switch failed closed - its contacts welded so 240V to the element never gets interrupted. This is the #1 element-stuck-on-high cause on KitchenAid's Whirlpool-platform electric ranges (KFEG/KSEG freestanding and slide-in) and it throws NO display code, because KitchenAid's F-codes are oven-electronics only - a cooktop switch fault is silent. The 6-inch infinite switch is WP3149404 (PS11740785 / AP6007668, 240V/5.2-6.6A), which the parts literature lists explicitly for a burner that 'remains stuck on high'; the 8-inch is WP3148953 (PS11740775 / AP6007658), a figure-8-shaft switch. We pull the knob and meter the switch for continuity at OFF - a switch that still reads closed with the dial off is the welded part, condemned on the spot.
• Match the infinite switch to the burner SIZE, not just the model - getting it wrong is the most common mis-order on a KitchenAid stuck-hot zone. The 6-inch WP3149404 and the 8-inch WP3148953 carry different ratings and different shaft cuts (the 8-inch has a figure-8 shaft), and a third surface-element control switch WP9763762 (AP6014172 / PS11747407, 240V/10.5A) covers other positions on the KitchenAid range/cooktop line. We confirm the exact switch against the customer's model/serial and the affected burner's diameter before ordering, because a switch specced for the wrong element size will either not seat the knob correctly or cycle the wrong wattage.
• On the OVEN side, element-stuck-on-high shows as the cavity running away past setpoint, and KitchenAid posts it as F2 ('Oven Temperature Is Too High'). PartSelect's KitchenAid fault-code guide is explicit on the cause and order: for F2, CHECK FOR WELDED CONTACTS ON THE BAKE AND BROIL RELAYS, and if present REPLACE THE CONTROL BOARD (clock/EOC) - the relay is part of the board and not separately serviced. A welded relay feeds the bake or broil element continuously so it glows and the oven climbs even when commanded off. We meter the relay load contacts with the oven OFF: continuity at rest condemns the model-coded oven control board, which we confirm by model/serial rather than quoting a generic board.
• Before any oven control board is quoted on an F2 runaway, the oven temperature sensor must be ruled out - KitchenAid's own F2 guidance says to also check the sensor, the sensor harness, and the harness connections, because the control board reads the RESISTANCE of the sensor circuit, not actual cavity temperature. The WAKO RTD sensor WPW10131825 (W10131825 / PS11748765 / 4455636) should read about 1,080 ohms at room temperature (70F); a drifted or high-resistance sensor circuit makes the control misjudge temperature and over-drive the element. A reading well off 1,080 ohms condemns the WPW10131825 sensor (and re-terminating any corroded sensor-harness connection), not the element or the board - so an inexpensive sensor (roughly a few tens of dollars) isn't mis-sold as a control board that runs into the hundreds.
• On a coil-top KitchenAid range, a single burner that heats hard the instant power is applied - regardless of dial position - can be an arced surface-element receptacle bypassing the switch, not the switch itself. The receptacle kit 330031 (WP330031 / AP3075808 / PS340571) is the terminal block the coil plugs into; pitted or carbon-tracked terminals can fuse a leg of 240V straight to the element so the burner sits on while the infinite switch reads perfectly good. We inspect and meter the 330031 receptacle terminals (and renew the coil alongside it when the prongs are burnt) before condemning a WP3149404/WP3148953 switch, because a shorted receptacle makes a healthy switch look guilty.
• A glass-top (radiant) KitchenAid zone stuck hot needs the element itself checked for a short to its sheath/chassis before the switch is condemned - a radiant coil that has arced internally to ground feeds one leg of 240V around the open switch, so the zone sits on no matter where the dial is set. We meter the radiant element for a short to chassis (not just for open continuity) as a distinct test from the coil-top receptacle check, since a grounded element and a welded infinite switch produce the identical stuck-on-high symptom but are different parts and different fixes.
• After replacing a welded infinite switch, an arced receptacle, or a stuck-relay oven board, a mis-wired terminal block, reversed line legs, or a floating neutral on the 240V circuit is the reason a stuck-on-high repeats or a new board fails the same way. KitchenAid electric ranges run on a dedicated 240V circuit; a bad terminal-block landing or back-fed leg can leave an element energized with the control off. On any REPEAT runaway we verify the terminal-block landing, the 240V legs, and ground before re-condemning a WP3149404/WP3148953 switch or the oven control board, so the new part doesn't die the same way.

KitchenAid surface element stuck on high in Toronto — the local specifics

• The recurring Toronto pattern on KitchenAid stuck-on-high is a coil or radiant burner that stays glowing with the knob at OFF and NO error code on the display - because KitchenAid's F-codes are oven-side only, owners assume the whole range is dead when it is almost always a single welded infinite switch on that one position; the oven-side version shows up separately as an F2 overheating runaway pointing at a welded bake/broil relay on the control board.
• We roll to these KitchenAid calls with the size-matched infinite switches (6-in WP3149404 and 8-in WP3148953, plus WP9763762 for other positions), a 330031 surface-element receptacle kit for arced coil terminals, and a WPW10131825 RTD to rule the sensor in or out before any oven control board is quoted - so a stuck-hot zone is metered and corrected on the first visit, with the model-coded board confirmed by serial only if the F2 relay is genuinely welded.

For the full KitchenAid stove module — every fault, part number and code — see KitchenAid stove repair in Toronto, and for the same fault across all brands the stove surface element stuck on high guide.