Thermador Stove Repair in Toronto — Gas burner clicks constantly

• A cracked surface-burner spark electrode is the leading cause of a Thermador star burner that clicks constantly but won't light. The igniter Thermador specs here is the surface-burner spark electrode 00418885 (replaces 1050123 / 418885; AH3462271 / EA3462271 / PS3462271, PS8712577) on most ranges, or 00189324 (replaces 189719 / 189889 / 413966 / 488832, PS8698440) by model. When the ceramic shield cracks the spark either weakens or arcs to the wrong path, so the electrode ticks audibly but never throws a hot enough spark across the star-burner gap to light the gas. We inspect the ceramic for hairline cracks and meter the spark path before condemning anything upstream, because a cracked electrode and a dead module both 'just click.'
• Continuous clicking with the knob OFF (or with every burner ticking at once) points at the spark ignition switch under the knob, not the electrode. The Thermador/Bosch igniter switch 00189008 (Lite-position switch; replaces 00411414 / 14-33-936, PS8698334) — and the alternate-generation surface-burner igniter switch 00428049 by model — is documented to cause continuous clicking even after the knob is returned past Lite. A switch whose contacts stick closed keeps signalling the spark module to fire. We isolate the bad knob by feeling which switch is held in and meter each switch before replacing the one at fault.
• Moisture in the spark switches after a boil-over or an aggressive cleaning is the most common no-part cause of all-burners-click on a Thermador top, and it mimics a failed switch exactly. Water bridging the switch contacts shorts them so the spark module fires continuously regardless of knob position. The honest first move is to dry the switch cavity (gentle warm-air dry-out, 20-30 min) and re-test before ordering an 00189008 switch — a dried switch that stops clicking saves the part entirely. This is consistent with the platform's known 'spark switches must be dry' behaviour.
• A burner cap knocked off-centre or blocked star-burner ports cause clicking-without-light that no electrode swap will fix. On Thermador's star geometry a cap even slightly off its base, or ports fouled with grease and food debris, starve the spark gap of gas so the electrode keeps ticking against air. We re-seat and centre the cap, clear the star-arm ports with a brush/toothpick, and confirm light-off before touching the 00418885 electrode or the spark module — a misaligned cap is the cheapest honest fix on this fault.
• When clicking is intermittent and the simmer side is involved, the ExtraLow / simmer control module is a real distinct suspect from the surface electrode. AppliancePartsPros' Thermador-cooktop diagnosis traces continuous/intermittent sparking to a simmer-control assembly (AP3672574 / mfr 00422882) with darkened, heat-damaged terminal-board spots — replacing the burned simmer module ended the sparking even though the separately-ordered spark module proved unnecessary. We read the terminal board for burn marks before parts-cannoning the spark path, because ExtraLow cycles the flame by design and that normal on/off is NOT the fault.
• A failed spark module (ignition control) makes ALL burners click without light or click with knobs off, because the module is the single high-voltage source feeding every electrode. The Bosch/Thermador spark module 00753257 (PS8737287 / AP5691482) is a documented six-point gas re-igniter with flame rectification for this platform. The classic tell is every burner ticking together — one shared module fault, not five bad electrodes — so we test for all-burners-tick and confirm a healthy switch/electrode path before condemning the module, the same shared-source logic the BSH cooktop platform follows.
• Poor burner grounding or a weak house ground makes the spark wander and tick without lighting even with a good electrode and module. Dirty burner bases, loose ground straps, or a poor appliance-to-outlet ground let the high-voltage spark seek a path other than the star-burner gap, so it clicks but won't reliably light. We clean the burner-base contact points and verify the chassis/house ground before ordering an 00418885 electrode or the 00753257 module, since a grounding fault throws the same constant-click complaint.

Thermador gas burner clicks constantly in Toronto — the local specifics

• The recurring Thermador-in-Toronto pattern for constant clicking is that it splits cleanly three ways before any part is ordered: a cracked surface electrode (00418885 / 00189324) on one burner, a moisture-shorted or stuck under-knob spark switch (00189008 / 00428049) making the whole top tick — very common after a heavy cleaning or boil-over — and a simple off-centre star-burner cap or grease-blocked ports that no electrode swap would ever fix. The all-burners-tick-together calls point at the shared switch/module path, not five bad electrodes; we test for that signature first.
• We carry the high-runner BSH surface-ignition parts to these calls — the 00418885 (and 00189324) spark electrodes and the 00189008 / 00428049 igniter switches — plus burner-cap re-seating and port-cleaning tools and a meter to dry-and-test the spark switches before replacing anything. The 00753257 spark module is model-confirmed and dealer-ordered when the all-burners-click signature actually warrants it; the AP3672574 / 00422882 ExtraLow simmer-control board is manufacturer-discontinued, so a burned-terminal-board diagnosis gets a sourcing/repair-vs-replace conversation up front, not a routine order.

For the full Thermador stove module — every fault, part number and code — see Thermador stove repair in Toronto, and for the same fault across all brands the stove gas burner clicks constantly guide.