Bosch Stove Repair in Toronto — Gas burner clicks constantly

• The single most common cause of a Bosch gas top that clicks and clicks without stopping (often with every knob OFF) is a wet or stuck-closed spark ignition switch (Bosch 00189008, replaces AP2821597 / 00411414, PS8698334) under one of the knobs. The switch normally only feeds the spark module when its knob hits LITE; once its contacts are bridged by a boil-over spill or stuck closed by baked-in grease, it sends continuous voltage to the module so the whole top sparks no matter where the dials sit. We dry and meter that switch first, because it is the cheapest fix in this fault chain and a stuck switch reads identically to a failed module on the display side.
• When every burner clicks in unison and none will light (or all spark randomly with knobs off and the switches test clean), the fault moves to the shared spark module that powers all the electrodes. There are two different modules to know: the 12004873 (PS10058840) is a 5-point re-igniter (Ri302) on NGM-family cooktops/ranges (e.g. NGM5456UC, NGM8654UC) and is a plain multipoint re-igniter with no flame sensing; the 00753257 (PS8737287) is the 6-point re-igniter WITH flame rectification on the BSH 6-point platform. On the 00753257, when its flame-sense circuit fails it cannot confirm a lit flame and keeps firing every electrode after ignition. We verify the electrodes and spark leads are good, then meter the module before condemning it — a module is the all-burner fix, not the first part off the truck.
• A single electrode that keeps clicking is usually a cracked ceramic shield on that burner's spark electrode (Bosch 00418885 — replaces AP3194444 / 1050123 / PS3462271 — on PGR-prefix sealed-burner gas ranges such as PGR304ZS, PGR364GDZS and PGR486GLZS, or 00612817 on NGM-family cooktop burners). A hairline crack in the ceramic leaks the high-voltage spark to ground before it can jump the burner gap, so you hear a continuous click but the arc never reaches the gas. We inspect the ceramic for cracks and watch the spark in a darkened kitchen — a visible flashover at the crack confirms the electrode rather than the module.
• Clicking that started right after a boil-over or a wet wipe-down and won't stop is moisture, not a failed part. Water bridges the gap between the electrode tip (00418885) and the burner cap's grounding point, shorting the spark to ground — you hear the click, but no usable spark reaches the gas — or it shorts the spark switch (00189008) closed so the top clicks with the knobs off. Bosch's own guidance is to power the range down, pull the caps and let everything air-dry (warming the cooktop underside ~350F for half an hour speeds it); we dry the wells and re-test before quoting any igniter, which avoids a needless part on a same-day call.
• A burner cap seated off its locating tabs makes the burner click forever even though the spark and gas are both fine: the off-center cap moves the cap's grounding edge away from the electrode gap, so the spark can't complete its arc-to-ground and the module never sees a lit flame to stop firing. We re-seat each cap to its tabs and clear any food debris from the ports before touching ignition electronics — this is the fault most often misread as a bad module.
• Persistent clicking with the electrode, switch and caps all proven good points back into the wiring between the spark ignition switch (00189008) and the spark module (12004873 on NGM-family / 00753257 on the 6-point platform): a pinched, melted or grease-fouled harness lead can hold a false LITE signal to the module and keep the whole top sparking. 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 $5 burnt terminal throws the same symptom.

Bosch gas burner clicks constantly in Toronto — the local specifics

• The recurring Bosch-in-Toronto pattern for constant clicking is moisture-driven: a boil-over or an over-enthusiastic wipe-down soaks the spark switch (00189008) or bridges the electrode-to-cap gap, and the top clicks with every knob off. A large share dry out and clear with no part — so we test-and-dry before we sell anything, and only the genuinely stuck switches, cracked electrodes (00418885) or failed spark modules (12004873 5-point NGM / 00753257 6-point flame-rectifying) get replaced.
• We carry the 00189008 spark switch, 00418885 / 00612817 surface electrodes, and the spark modules — the 12004873 (5-point, NGM-family) and the 00753257 (6-point, flame-rectification) — to these calls, plus a meter to confirm a stuck-closed switch versus a failed module before any part goes in.

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 gas burner clicks constantly guide.