Bosch Wall Oven Repair in Toronto — Self-clean won't start, or door locked after self-clean

• F43 is the defining "door stuck locked after self-clean" code on Bosch 500/800/Benchmark wall ovens (HBL3550/HBN3550/HBL8750 columns): the control could not get the upper/single oven motorized latch to UNLOCK once the pyro cycle ended and the cavity dropped below the safe-unlock threshold. AppliancePartsPros and RepairClinic document the root cause as a defective or jammed latch hook, a failed upper-oven door/latch switch, or a defective latch motor or its wiring. Before condemning electronics we visually inspect the latch for burnt food residue or grease binding the hook, then meter the door-latch switch for continuity (it should make on plunger press) and check the P4 latch-switch and P10 latch-motor connectors at the power board for pinched or chafed leads. When the motor/switch is genuinely failed, the fix is the door lock motor & switch assembly 00751505 (AP5669691, PS8737154; replaces 00644216 / 00663804).
• F41 is the mirror-image fault and a real distinct code: the upper/single oven motorized latch will NOT LOCK, so the self-clean cycle refuses to start (or aborts immediately) and the customer reads it as "self-clean won't run / door won't lock." Per AppliancePartsPros the causes are a defective or jammed upper latch, latch switch, or latch motor - the same hardware family as F43 but caught on the engage stroke instead of the release stroke. We confirm the latch motor drives the hook out and the lock switch closes; if the solder joints in header P4 on the power board are broken or the P10 motor lead is pinched, the latch never seats. Resolution is again the 00751505 lock assembly, or the power board only if a known-good latch still won't lock.
• F44 is the lower-oven variant that shows up on Bosch double-oven columns: the control cannot get the LOWER oven latch to unlock, leaving that cavity sealed after a clean while the upper oven behaves normally. The diagnosis follows F43 but on the lower latch circuit - RepairClinic/AppliancePartsPros trace it to the lower door latch, its switch, or the latch motor, with the lower-latch switch harness landing at connector P24 (and the latch motor at P10) on the main power board (verify it is fully seated, all pins making contact). The same 00751505-class lock assembly serves the lower cavity; we confirm which latch is involved by model/serial before ordering so the right cavity's part is on the truck.
• The single most common mechanical cause of a permanently-stuck Bosch self-clean latch is heat-stressed, worn latch hardware rather than the electronics: after repeated high-temperature pyro cycles the latch hook and its return mechanism wear and can fail to retract fully, throwing F43 even with a healthy motor and switch. A hook that no longer retracts on schedule strands the door locked, which is why we replace the complete door lock motor & switch assembly 00751505 rather than chasing the switch alone - the assembly bundles the motor, switch and hook hardware that all see the same heat cycling.
• Some Bosch series surface a self-clean lock-safety variant under E118/F118 rather than a pure latch code: on those models E118 is tied to the temperature/lock-safety read path, so the control will not release the latch until it trusts cavity temperature - and a drifting or grease-fouled NTC thermistor 00422222 (AP3729929) that reads falsely hot can leave the oven convinced it is still too hot to unlock. We meter the NTC at the connector against the model's documented resistance curve before touching the latch on these models, because a recovered or cleaned probe releases the door without a single latch part being ordered.
• A genuine overtemp event presents as a stuck-shut oven too: E115/F115 is the protective overtemperature shutdown - the control read cavity temperature past the safe ceiling, latched the elements off AND locked the door, which to the customer looks like a self-clean that quit and won't release. Root cause is a false-high NTC 00422222 reading or a welded/stuck element relay on the relay control board 00492069. This is a fire-risk code: we prove sensor resistance versus a stuck relay before clearing it or forcing the latch, never reset-and-return.
• A stalled or stuck self-clean where the door locks but the cavity never climbs (so the latch never releases on schedule) often traces back to the relay control board 00492069, which Bosch documents with the symptom pair "oven does not reach temperature" / "exceeds the set point or will not turn off." If a relay channel can't drive the pyro element, the cycle stalls below target, times out, and the control holds the latch engaged. On these BSH/Thermador-shared columns the relay board is diagnosed as a pair with display/control board 00702450/00702451; we put an AC voltmeter on the element terminals during the clean cycle to prove a dead relay channel before quoting four-figure-adjacent electronics.

Bosch self-clean won't start, or door locked after self-clean in Toronto — the local specifics

• The recurring Bosch-in-Toronto pattern for this fault is the post-pyro lockout: the customer runs a heavy self-clean - very often right before a holiday or dinner - the cycle finishes but the cavity-cooled latch never retracts, and the oven throws F43 (or F41 if it would not lock to begin with). On the heavily-cycled 800/Benchmark columns the failure is almost always the heat-stressed latch hardware in the 00751505 assembly rather than the control, and double-oven columns show the lower-cavity F44 version where only the bottom oven stays sealed.
• We bring the door lock motor & switch assembly 00751505 (AP5669691 / PS8737154; covers the 00644216 / 00663804 supersessions) plus the NTC oven sensor 00422222 for the E118/E115 temperature-and-lock-safety variant, and a wire latch-release tool to free a stuck door on the spot. The relay control board 00492069 (paired with display board 00702450/00702451) is confirmed by model/serial and ordered if the clean stalled on heat rather than the latch.

For the full Bosch wall oven module — every fault, part number and code — see Bosch wall oven repair in Toronto, and for the same fault across all brands the wall oven self-clean won't start, or door locked after self-clean guide.