Bosch Refrigerator Repair in Toronto — Running constantly / never shuts off

• A dust-blanketed condenser coil is the number-one runs-constantly cause on these Bosch counter-depth and bottom-mount cabinets, and it is the cheapest real fix on this symptom: when the coil cakes over it can't shed heat, the compressor never reaches a satisfied cut-out, and the box runs nonstop while still holding temperature. RepairClinic's own Bosch runs-constantly guidance pins dirty condenser coils as the leading cause (resolving roughly a quarter of these calls). On Bosch counter-depth units the coils need a brush-and-vacuum every 6-12 months; we confirm the coil is the fault and clean it before quoting any part, because a unit that recovers on a cleaned coil needs maintenance, not a component.
• A stalled or seized condenser fan is the classic 'clean coil but still runs nonstop' Bosch fault and the trap on this symptom: the condenser fan pulls air over the coil AND across the compressor body, so when it quits the compressor overheats and runs continuously trying to keep up, eventually cycling on thermal overload rather than on setpoint. The OEM condenser fan motor is Bosch 00795952 (genuine Bosch/Thermador; sibling 00601016 on some platforms). We pull the lower rear access panel, spin the blade by hand -- it must turn freely -- then meter the windings for continuity; no continuity condemns it. A seized condenser fan throws no thermistor E-code, so it surfaces only as constant running, never as a display fault.
• A stalled evaporator fan makes a Bosch run constantly because the cold the coil produces never circulates into the cabinet, so the control keeps calling for cooling and the compressor never stops. On single-evaporator French-door and bottom-mount cabinets the OEM freezer/evaporator fan motor is Bosch 00672636 (fits Bosch/Thermador/Gaggenau). We spin the blade by hand and ohm the windings for continuity; a seized bearing or open winding condemns it. On the 800-series B36CT/B36CL dual-compressor/dual-evaporator units a single side running nonstop points at that compartment's own evaporator fan circuit, so we model/serial-verify the platform before quoting the shared 00672636.
• An iced-over evaporator from a dead defrost circuit makes the compressor run constantly because frost insulates the coil and chokes airflow, so the system works nonstop to move heat it can no longer reach. The OEM defrost heater is Bosch 12023292 (Bosch/Thermador/Gaggenau); on older B22CS Evolution side-by-side cabinets it is the genuine 00671995. We pair the heater with a continuity check of the evaporator temperature sensor 11030589, since a sensor that fails to initiate or terminate defrost is what lets the coil ice over. The field tell is that a manual defrost restores cooling but the runs-constantly complaint returns within days -- that re-ice points at the heater or sensor, not the fan. We pull the freezer evaporator cover, confirm a frost-packed coil, and meter the element in service mode (an open heater passes no current) before fitting either part.
• A defective NTC thermistor forces the board to drive the compressor continuously, and Bosch ties the fault to a readable code: E01 = fresh-food compartment sensor, E02 = freezer compartment sensor. boschappliance.support documents E01 as a lost-communication / failed fresh-food NTC fault and states the refrigerator may run continuously when it occurs -- with no trustworthy temperature reading the board never registers that setpoint is reached, so it never cuts the compressor. We read the code with the door-combo service mode, inspect the harness for corrosion or melted insulation (connectors at the sensor flake after repeated defrost moisture), then ohm the matching thermistor across a temperature swing -- resistance must climb as it cools -- before condemning a board. A runs-constantly complaint showing E01 or E02 is a thermistor fix, not a sealed-system job.
• A door gasket that has lost compression keeps a Bosch running constantly by letting warm room air leak in: the heat load never lets the compartment satisfy, so the compressor runs nonstop even though every component tests good. On heavy 800-series French doors a torn or compression-set fresh-food gasket (OEM 11030520, Bosch/Thermador French-door seal) is the usual offender, and counter-depth Bosch doors are prone to alignment drift that breaks the seal at the mullion. We dollar-bill-test the full perimeter and check door/hinge alignment before touching any cooling part -- many of these resolve at a gasket replacement or a hinge/alignment adjustment. Bosch seals are model-coded and not interchangeable across the B36 line, so we confirm the exact gasket by full model/serial before ordering.
• A stuck-open air damper makes the fresh-food side over-cool and the compressor run continuously: the damper meters cold air from the freezer evaporator into the fridge compartment, and when it jams open excess cold dumps into the fresh-food cabinet so the control keeps the system running to hold the freezer. The OEM Bosch air-damper control assembly is 00798467, listed by distributors as controlling cold airflow from the freezer compartment into the refrigerator compartment. We confirm the evaporator fan is actually running, then watch damper movement and check for items frozen against the diffuser before quoting -- a stuck-open damper presents as constant running with the fridge side too cold, the mirror image of the stuck-closed damper that warms the fridge.

Bosch running constantly / never shuts off in Toronto — the local specifics

• The recurring Toronto pattern on Bosch runs-constantly calls is that the unit is still cold -- it just never shuts off -- and the cause is far more often an airflow/maintenance fault than a dead compressor: a dust-caked condenser coil or a stalled condenser fan (00795952) that lets the compressor overheat and run on overload, or a frosted evaporator from a tired defrost heater (12023292) where a manual defrost helps for a few days and then the complaint comes right back. On the heavy 800-series French doors we also see the seasonal gasket-and-alignment version, where humid summer air leaking past a compression-set 11030520 seal keeps the box from ever satisfying. When the display posts E01 or E02, we read it as a fresh-food/freezer thermistor fault driving the constant run rather than reaching for the sealed system.
• We carry to these Toronto calls the condenser fan motor 00795952 (sibling 00601016), the evaporator fan motor 00672636, the defrost heater 12023292 (and 00671995 for older B22CS Evolution cabinets) with the evaporator temperature sensor 11030589, plus the NTC thermistor family (11030589 / 00612240) for E01/E02. We bring the coil brush-and-vacuum kit and a dollar-bill gauge first, since a cleaned condenser or a re-aligned door with a re-seated gasket resolves a large share of these before any part goes in; the door gasket 11030520 and any model-coded control board we confirm by full model/serial and pre-order rather than carry blind.

For the full Bosch refrigerator module — every fault, part number and code — see Bosch refrigerator repair in Toronto, and for the same fault across all brands the refrigerator running constantly / never shuts off guide.