Thermador Wall Oven Repair in Toronto — Oven not heating at all

• Open-circuit bake element is the leading flat no-heat cause on Thermador (BSH) Masterpiece/Professional wall ovens: the bottom bake element fails open with no visible burn mark, so the cavity never climbs. We ohm it cold from the rear cavity wall -- a healthy Thermador element reads roughly 10-75 ohms (typically ~20-40) and glows fully red, so an open (OL) reading plus no glow confirms the element over the board. The 30in/22in-width element is OEM 00367648 (AP2826720; replaces 1028908 / 14-38-443) and the 27in cavity element is 00367649 (AP2826721, PS8704894; replaces 1038611 / 14-38-444) -- both genuine BSH parts shared with the Bosch line and DIY-friendly drop-ins.
• Error E101 / E104 is a real BSH upper-oven temperature-sensor circuit fault that cuts heat: E101 is the NTC probe reading open, E104 is the probe reading shorted, so the control stops trusting cavity temperature and won't drive the elements. The probe should read ~1080 ohms at 70F; we check and reseat the sensor harness, then meter probe 00414152 (with 00627375 the newer successor-class NTC on later models) before condemning it. Because 00414152 is discontinued on many models, we confirm the model tag so the correct OEM-equivalent NTC is ordered rather than guessing.
• Error E201 / E204 is the lower-oven mirror of the same sensor fault on Thermador double-oven columns -- E201 the open circuit, E204 the short -- leaving the lower cavity dead-cold while the upper oven behaves normally. The fix follows the upper-oven path but on the lower NTC circuit: confirm ~1080 ohms at 70F, inspect the lower sensor harness, then replace the 00414152-class probe for that cavity, and only swap the electronic control board if a known-good probe still codes. We confirm which cavity is involved by model/serial before ordering so the right NTC is on the truck.
• Error E305 is a real BSH temperature-sensor fault that surfaces as a no-heat / shutdown event, very often from grease contamination shorting the NTC probe tip and harness on a heavily-used Thermador oven. The honest first step is to power down at the breaker for ~5 minutes, clean the probe and connector, and re-meter (~1100 ohms at room temp) before ordering sensor 00414152 -- a cleaned probe sometimes recovers and saves the part, while a reading well off-curve confirms the NTC.
• Error E115 is the overtemp tail of a no-heat call: the control read cavity temperature past the safe ceiling (typically above ~550F in normal bake), latched the elements off and locked the door, which the customer experiences as an oven that quit and now runs cold. Root cause is either a false-high NTC reading (00414152 off-curve) or a welded/stuck-closed element relay on relay control board 00492069 keeping an element energized. This is a fire-risk code -- we prove sensor resistance versus a stuck relay before clearing it, never reset-and-return.
• A no-heat that is really the relay control board: Thermador/BSH board 00492069 carries the documented symptom set 'oven does not reach temperature' and 'exceeds the set point or will not turn off' -- a relay channel that no longer cycles an element cleanly. Before quoting four-figure-adjacent electronics we do the honest checks first (confirm 220-240V at the outlet, inspect the cord and internal element-leg wiring, since a loose 240V leg or tripped breaker mimics a dead board), then put an AC voltmeter on the element terminals through bake/broil/convection to isolate a dead relay channel. On these columns 00492069 is diagnosed as a pair with display/control board 00702450 / 00702451, and both are typically rebuilt or replaced together when one is condemned.
• Convection-mode no-heat is a separate heat path on fan-equipped Masterpiece/Professional cavities: the convection element and its dedicated relay channel on board 00492069 are independent of the bottom bake circuit, so an oven that bakes fine but stays cold in convection points at the convection element or that relay channel -- not the bake element 00367648 / 00367649. We verify each heat circuit independently rather than swapping the bake element on a convection-only complaint.

Thermador oven not heating at all in Toronto — the local specifics

• The recurring Thermador-no-heat pattern we see across Toronto is the grease-shorted NTC throwing E305 / E101 / E104 on heavily-used kitchens, and the open bottom bake element on older Masterpiece and Professional cavities -- both cheap, confirmable saves. The expensive tail, the 00492069 relay board with its 'does not reach temperature / exceeds set point' signature, shows up less often but is the one customers have usually been quoted a full board swap for elsewhere; we meter the element terminals to prove the dead relay channel before agreeing. This is a qualitative pattern from these calls, not a job count.
• We roll to a Thermador no-heat call carrying the crossover bake elements 00367648 (22in/30in) and 00367649 (27in) and the 00414152 NTC oven sensor, plus a meter to prove element continuity (~10-75 ohms) and probe resistance (~1080 ohms at 70F) on site. The relay board 00492069 and 00702450 / 00702451 control/display boards are not carried blind -- we confirm them by model/serial after the meter rules out the element and sensor, then order or board-repair.

For the full Thermador wall oven module — every fault, part number and code — see Thermador wall oven repair in Toronto, and for the same fault across all brands the wall oven oven not heating at all guide.