LG Stove Repair in Toronto — Knob not turning or igniting

• Platform split first, same as the rest of this LG range platform: a knob-not-working fault is a COOKTOP-side hardware problem and throws NO display code at all. LG's F-codes are OVEN-side only (F9 = the oven failed to reach about 150F within roughly five minutes of preheat, F11 = a communication error between the main control board and the display board), so a knob that spins free, won't turn, or won't shut a burner off never posts a code on the LRG/LSG ProBake gas or LRE/LSE/LSEL smoothtop families. That makes it a fixed-order isolation job worked at the knob, then the stem behind it (spark switch / infinite switch / gas valve), and we never chase the EBR74164814 oven relay board or a main board off a code that never appears.
• A knob that SPINS FREELY and no longer rotates the stem is the single most common knob-not-working cause, and it is owner-mistaken for a dead switch. LG knobs seat on a D-shaped shaft; per RepairClinic, if a range's surface element won't turn off you first inspect the knob, because a cracked knob or a rounded-out D-bore spins on the stem without rotating the switch back to OFF. The OEM D-shaft range knob RepairClinic flags to inspect first is AEZ75853716 (RepairClinic 4978974); LG also catalogs model-coded knobs (the gas-range knobs AEZ73453509 and AEZ73453513 per LG USA, the range control knob AEZ74293302 / superseded AEZ74293304 per RepairClinic) and the gas-range knobs EBZ37189609 / EBZ37189611 (the model-matched knobs on the LRG30357ST). A knob spinning loose on its shaft is the giveaway and a cheap fix versus the switch or valve behind it, so we inspect and swap the knob FIRST.
• On an ELECTRIC LG range, a knob that turns but the burner WON'T SHUT OFF (or won't change heat) when the knob itself is good is the surface element (infinite) control switch with welded or burnt contacts, LG EBF62174906 (PartSelect direct number PS17631121; older EBF62174901-family cross-refs AP6037530 / PS11771631). The infinite switch cycles 240V to set the heat level; per RepairClinic, when its internal contacts fuse closed it feeds the element continuous voltage so the zone stays hot regardless of the knob, and a burnt contact can also leave a zone dead at every setting. We meter the switch for 0-ohm/closed continuity in the OFF position, condemn that switch, and treat a stuck-on burner as a live safety hazard until it is replaced.
• On a GAS LG range, a knob that turns but the burner WON'T LIGHT (no click, no spark) at that position alone is the spark ignition switch failed open behind that knob, not the electrode or module. The switch only closes when the knob reaches the spark/LITE position to feed the module; a burnt or pitted contact means that position never signals the module. LG supplies this as the switch-and-harness assembly EBF60662901 (officially superseded to EBF60662911; PartSelect PS3533611; also covers Kenmore/Sears-branded LG ranges), so it carries the wiring for all the surface burners. Per RepairClinic, if the OTHER burners spark fine, the switch for the dead position is the likely failed part, so we meter that switch for continuity at the spark position before quoting the harness assembly.
• On a GAS LG range, a knob that is STIFF or WON'T TURN (or a burner that stays on with the knob at OFF) when the knob itself is intact is a seized or failed burner gas valve, identified by position: LG MJX61842207 left-front, MJX61842203 left-rear, MJX61842209 right-front, MJX61842210 center (all per RepairClinic). The diagnostic, per RepairClinic, is to pull the knob and turn the valve stem by hand; if the stem will not rotate, or the burner stays lit at OFF, the valve is defective and gets replaced. This matters because LG's plastic knob sleeves (documented as fragile on the LRG30357ST) crack from the high torque of fighting a stiff valve, so a customer's 'broken knob' is often a stuck valve underneath, and in Ontario any open gas-line work falls under TSSA gas scope.
• A knob that BINDS or feels gritty before any part is condemned is frequently a clean, not a swap, and a $0 fix on a same-day call. Grease and boil-over residue creep down the knob shaft and pack the bezel/skirt so the knob drags or won't seat to OFF; LG's guidance is to pull the knobs and clean the shaft and collar. We pull and degrease each knob and confirm it seats flush with OFF centered at the top before ordering an AEZ75853716/EBZ37189611 knob or the EBF62174906 switch, because a gummed-up knob mimics a failed switch and is a wipe-down, not a part.
• Distinguishing a true knob fault from a normal design behavior keeps the quote honest. On gas, the knob must be pushed in and held at the spark/LITE position to light, and LG sealed burners briefly re-spark if a flame blows out (the electrode senses flame by rectification), so a quick burst is by design; on electric, a high setting glows steadily and only the hot-surface light lingers as it cools. The fault is a knob that spins without engaging, a burner that stays HIGH with the knob OFF, or a stem that won't rotate by hand. We confirm the exact pattern (which position, spins-vs-stuck, single vs multiple knobs) before ordering, so a single knob (AEZ75853716) or a per-position switch/valve job isn't mis-sold as a board, or vice versa, and we advise killing the breaker or gas to a stuck-on burner until it's repaired.

LG knob not turning or igniting in Toronto — the local specifics

• The recurring LG-in-Toronto pattern for knob-not-working is a knob that spins free on its D-shaft and no longer rotates the stem, with the customer convinced the switch or valve has failed; on the gas ProBake ranges we also see the cracked-knob-from-a-stiff-valve sequence, where the plastic sleeve splits because the owner has been forcing a knob against a seizing burner valve, so the real fix is the valve underneath, not just the knob. On electric smoothtops the second-most-common version is a good knob over an infinite switch whose contacts have welded, leaving a burner stuck on HIGH.
• We bring the AEZ75853716 D-shaft knob plus the model-coded gas knobs (AEZ73453509 / AEZ73453513, EBZ37189611) and other LG knobs, the EBF62174906 surface-element infinite switch (PS17631121) for stuck-on electric burners, and on confirmed gas calls the EBF60662911 spark switch-and-harness; the position-coded burner valves (MJX61842207/203/209/210) we match to the customer's model/serial and burner position before the visit when the symptom is a stem that won't turn.

For the full LG stove module — every fault, part number and code — see LG stove repair in Toronto, and for the same fault across all brands the stove knob not turning or igniting guide.