JennAir Stove Repair in Toronto — Gas burner clicks but won't light

• Spark electrode cracked or fouled (single burner won't light): the most common JennAir surface no-light is the spark electrode itself - the verified Jenn-Air-compatible part is WP74009336 (AP6011124/PS11744318), a male-spade electrode measuring just under 1.5 inches long mounted under the burner. Its fragile ceramic insulator cracks, letting moisture in, so one burner clicks but throws no spark or sparks weakly while the others light fine. We confirm WP74009336 vs the KitchenAid-sibling electrode WP8523793 (AP6012852/74007473) by model/serial - both are valid Whirlpool/Jenn-Air surface-burner electrodes and which one fits is model-coded.
• Stuck or shorted spark-ignition switch (whole top clicks even with knobs off): each burner has a small spark switch under its knob that closes to fire the module. When a boil-over or spray cleaner seeps down the knob shaft, the switch shorts closed and feeds continuous voltage to the spark module, so the cooktop clicks constantly no matter where the dials sit - and the burner you actually want still won't catch. We dry the switches (24h unplugged, or cool air from a blow dryer with knobs off) and bench-test each switch for a short before condemning anything; a genuinely shorted switch gets replaced, not the module.
• Spark module fault (WPW10475147) - confirmed last, not first: the 4-point re-ignition spark module under the cooktop powers every electrode. A truly defective module gives a weak or intermittent spark across multiple burners. Per JennAir/RepairClinic procedure the module (WPW10475147) is only condemned after the electrode (WP74009336/WP8523793) and the spark wire check out - most 'dead module' calls in this platform are actually moisture in the switches or a cracked electrode, so replacing WPW10475147 first is the classic misdiagnosis we avoid.
• Moisture or debris in burner ports / misaligned burner cap (clicks, no flame): JennAir's own product help lists moisture in the ports from cleaning or a spill, clogged ports, and a burner cap not seated flush as primary causes of 'clicks but won't light.' Following JennAir's instruction we clear ports with a straight pin without enlarging or distorting the port (never a wooden toothpick, which can break off), reseat the cap so it doesn't wobble, and let any cleaning moisture fully dry - a no-parts fix that resolves a large share of these calls before any electrode comes out.
• Downdraft-blower flame interference (the JennAir-signature fault): on the proprietary JGD/JX3 gas downdraft cooktops and JES/JDS downdraft slide-ins, the integral vent blower can disperse the flame away from the spark igniter, so the burner reads as 'won't stay lit / keeps re-sparking.' JennAir's own fix is to decrease the downdraft vent blower speed or increase that burner's flame setting - this is unique to the downdraft line and is a setup/condition fix, not a parts swap, so we check it before quoting any ignition hardware on a downdraft unit.
• Control lockout after a power blip (false no-light): JennAir touch-control gas tops enter a Control Lockout state after a power loss and won't spark until cleared. Touching the lock key for 3 seconds restores ignition (the indicator clears and one long tone sounds). We rule this out on any post-outage 'whole cooktop dead' call before opening the unit - it costs nothing and saves a needless module quote.
• Weak gas-oven flat glow-bar igniter (when the 'burner' that won't light is the oven): on JennAir gas ovens the bake igniter is the 12400035 flat glow-bar kit. It can glow orange yet draw too little current to open the gas safety valve, giving long preheat then no bake. We measure igniter current draw to spec (the listed flat-glowbar range is ~3.3-3.6A) rather than eyeballing the glow - the orange-but-weak igniter is the single most misdiagnosed JennAir gas no-bake.

JennAir gas burner clicks but won't light in Toronto — the local specifics

• The recurring Toronto pattern on JennAir gas 'won't light' is that the cooktop is clicking constantly with no flame, and the homeowner assumes a dead spark module. In practice it lands on moisture or a shorted spark switch from a boil-over (or aggressive spray-cleaning) far more often than on the WPW10475147 module itself, with a cracked WP74009336 electrode the next most common. On the downdraft slide-ins that are popular in open-plan Toronto island kitchens we also see the blower-disperses-the-flame complaint, which is a settings fix, not a parts fix. We diagnose switch/electrode/downdraft-setting before condemning the module.
• We roll to these calls carrying the platform-shared ignition parts so a confirmed fault is fixed in one visit: both candidate electrodes (WP74009336 and the KitchenAid-sibling WP8523793, matched by model/serial), spare spark-ignition switches, the WPW10475147 spark module, and the 12400035 flat glow-bar igniter when the no-light is the gas oven rather than a surface burner. Downdraft and pro-style trim parts are model-coded, so those we confirm and order rather than stock on the truck.

For the full JennAir stove module — every fault, part number and code — see JennAir stove repair in Toronto, and for the same fault across all brands the stove gas burner clicks but won't light guide.