Bosch Stove Repair in Toronto — Spark module / igniter failure

• On a Bosch gas top where every burner sparks at once and won't stop -- or keeps clicking after a burner is already lit -- the part most people blame is the shared spark module, and on the 6-point BSH platform that is the 00753257 (PS8737287), a re-igniter WITH flame rectification (it supersedes 00189326 / 00421087 / 00484843-848 / 00486771 / 00488819 / 00493587 / 00493772). On this module the flame-sense circuit is supposed to stop pulsing each electrode the instant it confirms a lit flame; when that rectification stage fails the module can't 'see' the flame and keeps firing every electrode after light-off. We meter the module and verify the electrodes/leads are good before condemning it -- it is the all-burner fix, not the first part off the truck.
• On NGM-family cooktops and ranges (NGM5456UC, NGM8654UC, NGM8655UC) the shared module is the different part 12004873 (PS10058840) -- Bosch's own catalogue calls it the multipoint 5-point Ri302 ignition device. It is the wrong physical part to drop onto a 6-point deck, so its failure shows up as random/continuous all-electrode firing rather than the post-light-off, flame-sense fault you chase on the rectifying 00753257. We confirm the model is an NGM build before ordering so we fit the correct module for that platform.
• The single most common cause that gets MISREAD as a dead spark module is the per-burner spark ignition switch 00189008 (PS8698334; replaces 00411414 / 1028579 / 14-33-936 / AH3440440, AppliancePartsPros AP2821597) under one of the knobs. The switch is only supposed to feed the module when its knob hits LITE; once a boil-over wets its contacts or baked grease sticks them closed, it sends continuous voltage to the module so the whole top sparks with every knob OFF. A stuck switch reads identically to a failed module on the spark side, so we dry and meter that switch first -- it is the cheapest fix in this chain and saves a needless module quote.
• When the module keeps sparking after a burner clearly has a good flame, the fault is often NOT the module at all but a defective spark electrode that the flame-rectification circuit relies on to sense the flame: a cracked ceramic on the 00418885 electrode (PGR-prefix sealed-burner ranges such as PGR304ZS / PGR364GDZS / PGR486GLZS; replaces 1050123 / PS3462271) or 00612817 on NGM-family burners (NGM3054/3654/5654/8654UC; replaces 1560064 / PS3477958) leaks the high-voltage spark to ground, so the 00753257's flame-sense stage never confirms ignition and keeps the electrode firing. We inspect the ceramic for hairline cracks and watch for a flashover in a darkened kitchen before condemning the module.
• Continuous all-burner sparking that started right after a boil-over or wet wipe-down is moisture bridging the gap, not a failed module: water shorts the electrode (00418885) to the burner cap's grounding edge, or shorts the spark switch (00189008) closed so the module fires with knobs off. Bosch's published guidance is to power the range down and let everything air-dry (a hairdryer on low over the igniter area speeds it). We dry the wells and re-test before quoting any 00753257 / 12004873 module, which keeps a $100+ board off a same-day call a dry-out would have fixed.
• A burner cap seated off its locating tabs (or a mis-seated / non-grounding surface-burner orifice holder) makes the burner spark forever even though spark and gas are both fine: the off-center cap moves the grounding edge away from the electrode gap, so the arc can't complete to ground and the flame-rectifying 00753257 module never registers a lit flame to stop firing. We re-seat each cap to its tabs and verify the orifice holder grounds properly before touching ignition electronics -- this is the fault most often blamed on the module.
• Persistent sparking with the electrode, switch and caps all proven good points back into the harness between the spark ignition switch (00189008) and the module (00753257 on the 6-point platform / 12004873 on NGM): a pinched, melted or grease-fouled lead can hold a false LITE signal to the module and keep the whole top firing. We chase that lead and its connectors before condemning the board, since the module is the most expensive part in this fault chain and a burnt $5 terminal throws the same symptom.

Bosch spark module / igniter failure in Toronto — the local specifics

• The recurring Toronto pattern on Bosch 'spark module' calls is that the module is usually NOT the failed part: the overwhelmingly common root cause is a boil-over that wet or stuck-closed the 00189008 spark switch (top clicks with every knob OFF), followed by a cracked-ceramic electrode (00418885) defeating the flame-sense on the 00753257. We see genuine module failures most often on the older NGM-family cooktops running the 5-point 12004873, where random all-burner firing with clean switches and electrodes finally isolates to the module itself.
• We roll to these calls carrying the 00189008 spark switch and 00418885 / 00612817 electrodes (the cheap, high-probability fixes), plus contact cleaner and a heat source to dry wet igniter wells. We confirm the model is a 6-point (00753257, flame-rectifying) versus an NGM 5-point (12004873) build before pulling the shared module so we order the right one, and we meter the module and harness on site before condemning the most expensive part in the chain.

For the full Bosch stove module — every fault, part number and code — see Bosch stove repair in Toronto, and for the same fault across all brands the stove spark module / igniter failure guide.