Bosch Dryer Repair in Toronto — Won't start / no power

• Platform first - a Bosch "won't start" splits by machine and the cure does not cross over. On the older NORTH-AMERICAN Nexxt/Axxis vented machines (WTMC3300US / WTMC3321US / WTVC6530UC) won't-start is a classic switch-and-fuse start-circuit chain (door switch, broken-belt switch, thermal cut-off/hi-limit, motor, control module). On the 24" condensation WTG86 and heat-pump WTW87 / WQB245 condo units the start path runs through an electronic door lock and module, so the same complaint points elsewhere - we confirm the platform by serial before quoting a part. (Bosch WTMC Gas & Electric Dryer Service Training; bosch-home.com dryer not-switching-on support.)
• The single most common Nexxt won't-start cause is the DOOR SWITCH, not the motor: the control module reads the door at 5V and will not energise the drum/fan motor if it sees the door open, so the panel lights but nothing tumbles and you hear no start click. The genuine Bosch part is the door switch assembly 00422183 (BSH cross-refs 9000233512 / 9000233511; fits Bosch/Thermador/Gaggenau, documented on the Nexxt 500/500 Plus and WTMC series). It sits behind the front panel, so the front shield and door seal come off to reach it; we meter it for continuity and vacuum the contact pocket before condemning - a dust-fouled contact sometimes restores without a part. (Bosch WTMC Service Training wiring notes; Reliable Parts / PartsDr 00422183.)
• On the Nexxt platform a dryer that's dead with the door reading closed is very often the BROKEN-BELT SWITCH tripped - a no-part reset that gets misdiagnosed as a motor or board failure. Bosch's own service training is explicit: the broken-belt switch is wired in series with the drum/fan motor, and "if the switch hasn't been reset, motor and heater will not work." The tensioner plunger trips when the belt goes slack or breaks; you reach it through the rear panel and push the black plunger on the left side of the motor (viewed from the rear) until it clicks. We always confirm the belt is intact and reset this switch before ordering anything - it is the textbook Bosch repeat-call when a tech swaps parts around a tripped switch. (Bosch WTMC Service Training - Drum/Fan Drive Motor; JustAnswer / DoItYourself Nexxt threads.)
• A Nexxt that won't start AND is stone dead (no display, no light) points at the heater-circuit THERMAL SAFETIES, which kill the start/heat circuit when they open. Bosch builds two on this vented platform and the distinction matters: the B9 hi-limit at the heater is a RESETTABLE 347F/175C cutout with a red reset button - the genuine Bosch part is the 175C high-limit thermostat 00422272 (red-button manual reset, fits WTMC/WTVC Nexxt) - while the B19 one-time thermal fuse at the lint screen / front shield opens at 194F/90C and does NOT reset, so it is replaced rather than reset. We meter both for continuity, and because a tripped hi-limit or a blown one-time fuse is almost always a symptom of a lint-choked exhaust run, we clear the vent before refitting or it just opens again. (Bosch WTMC Service Training - hi-limit/fuse temps; PartSelect / RepairClinic Bosch 00422272 high-limit thermostat.)
• Drum free-wheels by hand, the door switch and broken-belt switch both test good, but the motor won't fire on START = the drum/fan DRIVE MOTOR 00436441. On the Nexxt 300/500 vented machines the blower fan rides on the SAME motor shaft, so a motor with worn bearings or an open winding that won't start usually kills airflow too - which is why a "won't start AND won't dry" pair on a WTMC points hard at 00436441 rather than two separate faults. We meter the motor windings and confirm the thermal-protector circuit before condemning it, since the motor is the priciest mechanical part in this start chain. (Bosch WTMC Service Training - motor circuit; existing N1 Bosch drive-motor 00436441 sourcing.)
• Lights-on-but-nothing-happens with the door switch, broken-belt switch, thermal safeties and motor all proven good is the CONTROL MODULE itself - the last suspect, not the first. Bosch's WTMC fault-code table flags the no-restart electronics directly: E:17 / E:18 are NTC sensor-circuit faults (R3 at the lint screen / R2 at the heater) where the "dryer stops & can't be restarted," and E:20 / E:21 / E:22 are EEPROM / checksum / invalid-update faults that all read "replace faulty control module." A separate tell is the S3 board switch: if the wrinkle-protect/finished light stays lit while the display is off (and stays on with the knob in Off), the module is damaged and the whole control module is replaced. We only condemn the model/serial-coded module after the start-chain checks come back clean. (Bosch WTMC Service Training - Test Program Fault Codes E:17-E:22 + S3 board test.)
• On the 24" condensation WTG86 and heat-pump WTW87 / WQB245 condo machines, won't-start is NOT a Nexxt-style mechanical switch job - the start path runs through an electronic door lock and the module, and these sealed units don't expose the field-serviceable broken-belt switch or vented-style thermal-fuse chain the Nexxt does. We rule out the owner-side causes first (a door not latched square, a tripped breaker, a control-lock/child-lock left on, or a paused program), then read the display: on this platform the E:0x family is filter/air-path and E:03 is the condensate-drain fault, so a "won't start / stops" complaint is often a drainage or lock fault, not a dead board. We say up front when a no-start on the sealed platform is a module/lock diagnosis rather than a parts-swap. (bosch-home.com dryer not-switching-on support; existing N1 Bosch condensation/heat-pump platform notes.)

Bosch won't start / no power in Toronto — the local specifics

• The recurring Toronto pattern on Bosch Nexxt won't-start calls is two no-part-or-low-part fixes hiding behind a "dead dryer": a door switch (00422183) the control no longer reads as closed, and - the one techs miss - a tripped broken-belt switch next to the motor that, per Bosch's own service training, leaves both motor and heater dead until the plunger is reset. We see the second one repeatedly after a previous repair that swapped parts around a tripped switch.
• We bring the 00422183 door switch and the 00422272 hi-limit thermostat to these Toronto calls, plus the multimeter to prove the broken-belt switch reset, the one-time thermal fuse and the 00436441 motor circuit before we order anything - so a no-part reset or a switch isn't quoted as a board.

For the full Bosch dryer module — every fault, part number and code — see Bosch dryer repair in Toronto, and for the same fault across all brands the dryer won't start / no power guide.