Frigidaire Stove Repair in Toronto — Surface element stuck on high

• Split the fault before quoting, exactly like the rest of this Frigidaire/Electrolux range platform: a surface zone stuck on high throws NO cooktop display code. The EOC F-codes this platform is famous for (F10 runaway-temp, F30/F31 RTD open/short) are OVEN-side only and never appear for a surface element that won't come down, so a stuck-on-high burner is a hardware-isolation job worked in a fixed order (knob/stem -> surface-element infinite switch -> radiant element -> surface power-relay board), and we never chase the 316418/316557-family oven EOC for it.
• Welded surface-element (infinite) switch is the #1 Frigidaire 'stuck on high' fault, not the element. The infinite switch sets power by rapidly cycling 240V on and off; when its contacts fuse closed in the full-on position it feeds the zone continuous line voltage and it runs flat-out no matter where the knob sits. The verified smoothtop switch is Frigidaire 318293821, superseded by 318293827 (PS2342883, the 8-inch/large-element variant); the coil-range siblings are the large-element 316436001 (8 in, AP3885460/PS1145040) and small-element 316436000 (6 in, PS1145039). Per RepairClinic/PartSelect a welded switch gives 'full heat that cannot be reduced,' and it is replaced, not repaired - a fraction of a board's cost and the genuine fix for this symptom.
• Switch-vs-element confirmed by voltage, the textbook stuck-on test: with the burner commanded HIGH we read continuity HIGH at L1-H1 / L2-H2, then return the knob to OFF, where every terminal must go open. If the switch still passes voltage at OFF its contacts are welded and the infinite switch (318293827 / 316436001 / 316436000 by build) is condemned. If voltage correctly drops to zero at OFF but the zone still glows, the fault is downstream in the element or the relay board - this published test is why we never throw an element at a switch fault on a stuck-on-high call.
• Radiant element shorted internally - the less common but real failure: the 6-inch 1200W radiant-element-WITH-limiter is Frigidaire 318178110 (OEM, PS1528719); the dual 6 in/9 in 3000W element is 316282000, superseded by 5304533520 (cross-refs AP4552732 / 316465001). We meter the radiant for continuity between the prongs and the metal case (a leak to ground): a grounded element typically trips the house breaker or fails open rather than running hotter than commanded, so we condemn it on the reading itself - continuity prong-to-case means the element is shorted to chassis and gets replaced. An open or normal-resistance element with a healthy switch sends us to the relay board instead.
• A zone that keeps glowing after the knob is fully OFF - where only the house breaker stops it - points past the infinite switch to a stuck-closed relay on the Frigidaire Range Surface Unit Power Relay Board 316442119 (AP4362611, PS2342728). RepairClinic documents this as the canonical relay 'burner won't turn off' cause: a board relay shorts closed and sends continuous voltage to the heating circuit regardless of the setting. We condemn it LAST and model-coded, only after the infinite switch for that zone meters good (voltage out at OFF, no relay drop-out) and the element tests clean - it is the most expensive part in the chain, so accurate isolation keeps a $40 switch job from being sold as a $200 board.
• Knob and stem checked before any switch is condemned: per RepairClinic's own guidance a cracked or rounded-out knob D-socket, or a worn switch stem, can leave the burner stuck at its last level because the knob can no longer rotate the infinite-switch shaft back to OFF. We feel whether the bare switch stem itself indexes to OFF (killing the zone) before quoting a switch - a sub-$45 model-coded knob swap that never touches the 318293827-class switch behind it, and a fast rule-out on a 'stays on high' call.
• Normal radiant cycling on HIGH ruled in first, before any part is quoted: Frigidaire owner support article 1847475 is explicit that the radiant elements on a smooth cooktop are DESIGNED to cycle on and off even on High to maintain even heat while protecting the cooktop from overheating, and that a pan smaller than the element or with a non-flat base makes the cycling more noticeable. An element that visibly cycles, responds to the knob, and drops voltage at OFF meters good and needs no parts - we separate this working-as-designed glow from the genuine welded-switch runaway, where the zone runs continuously and never cycles, to avoid a needless switch or element swap.

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

• The recurring Frigidaire-in-Toronto pattern for a surface zone stuck on high is a welded infinite switch on a smoothtop Gallery or builder-grade coil range - the contacts fuse in the full-on position and the burner runs flat-out until the breaker is pulled. We routinely confirm it with the HIGH-then-OFF voltage test (continuity that won't clear at OFF = welded) and rule out normal HI cycling and a worn knob/stem first, reserving the 316442119 relay board for the calls where only the breaker stops the glow.
• We carry to these calls the model-matched surface-element switches (318293827 for 8 in smoothtops, 316436001/316436000 for coil tops), the common radiant elements (318178110 6 in with limiter, 316282000/5304533520 dual 6/9 in) for a confirmed prong-to-case short, plus a 316442119 Surface Unit Power Relay Board on hand for the stuck-closed-relay runaways, and a meter to split switch from element from board before anything is fitted.

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