Thermador Wall Oven Repair in Toronto — Not reaching or holding temperature (uneven baking)

• Relay control board failure is the signature not-reaching-temp fault on Thermador (BSH) wall ovens. Board 00492069 carries the documented symptom set 'oven does not reach temperature' and 'exceeds the set point or will not turn off' — a relay that no longer cycles the elements cleanly. On these models the relay board pairs with main/display control board 00702450 or 00702451, so an AC-voltmeter check at the element terminals during bake/broil/convection isolates a dead relay before any board is condemned.
• Bake element open-circuit: on 30" Masterpiece/Professional cavities the bottom bake element 00367648 (a ~22" element, replaces 1028908 / 14-38-443) is the most common no-heat / slow-heat part; the 27" variant is 00367649. A good element reads roughly 10-75 ohms on continuity (typically around 20-40 ohms) and glows fully red — no glow plus an out-of-range or open reading confirms replacement rather than a control fault.
• Oven temperature sensor drift or short makes the oven undershoot or never close the loop to setpoint. Thermador's listed probe 00414152 (also seen as 00627375) should read about 1000-1100 ohms at room temperature (roughly 1080 ohms); an open reading (OL) or a resistance well off that baseline means the board is being fed bad temperature data and won't drive the elements correctly. Because the original 00414152 is discontinued on many models, confirm the model tag so the correct OEM-equivalent sensor is ordered.
• Error E305 is a real BSH temperature-sensor fault code shared across Thermador/Bosch ovens — typically the sensor shorting, very often from grease contamination at the sensor tip and harness. The honest first step is to unplug, clean the probe and connector, and re-test resistance before ordering 00414152, because a cleaned sensor sometimes recovers and saves the part.
• Error E011 on the BSH/Thermador oven platform is a temperature-sensor (NTC probe) circuit fault, in the same family as the E101/E104 upper-oven and E201/E204 lower-oven sensor codes — not a control-panel or stuck-key fault. The probe reads ~1080 ohms at 70F and the fault is often grease contamination at the tip or harness, so we clean and re-meter the NTC before condemning sensor 00414152, replacing the electronic control board only if a known-good probe still codes.
• Convection-mode shortfall: on fan-equipped Masterpiece/Professional ovens the convection element and its dedicated relay on board 00492069 are a separate heat path from bake — an oven that bakes fine but won't come up to temp in convection points at the convection element or that relay channel, not the bake element, so each heat circuit is verified independently.

Thermador not reaching or holding temperature (uneven baking) in Toronto — the local specifics

• The recurring Toronto pattern on Thermador not-reaching-temp is two-headed: older Masterpiece/Professional ovens that turn out to be a tired bake element with no glow, and electronically healthy ovens throwing E305 or quietly undershooting that trace back to a grease-contaminated temperature probe or a relay board (00492069) that no longer cycles the elements. Built-in column installs in condos mean the diagnosis is done before the oven is pulled, so we arrive expecting to verify both the element circuit and the sensor before committing a board.
• We carry to these calls the common bake/convection elements (00367648 / 00367649) and an oven temperature sensor (00414152), plus a multimeter to read element continuity and the sensor's resistance on the spot; relay and main control boards (00492069, 00702450/00702451) are model-confirmed and ordered after the tag lookup rather than carried blind.

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 not reaching or holding temperature (uneven baking) guide.