Thermador Refrigerator Repair in Toronto — Freezer cold but fridge warm

• On a single-evaporator Thermador built-in, freezer-stays-cold-but-fridge-goes-warm is, before anything else, an air-path problem, not a sealed-system or compressor fault: the freezer makes cold normally, but the cold air never reaches the fresh-food cabinet. The #1 cause on this BSH platform is the air damper control assembly stuck closed. The damper is a motorized flap that meters freezer air into the fridge compartment; when it sticks or its motor fails, the fridge climbs into the 50s F while the freezer holds 0-5F. The genuine Bosch/Thermador/Gaggenau part is air damper control assembly 00798467 (genuine OEM, replaces AP5806530 / 798467). We command the damper open in diagnostics and watch it cycle before condemning it, since a backed-out harness pin throws the same warm-fridge symptom and is the cheaper find.
• The second classic freezer-works-fridge-warm root cause is a stalled evaporator fan: the single evaporator's cold is trapped in the freezer because the fan that pushes it up the duct into the fresh-food side has seized. On these built-ins the fan is 00672636 (genuine Bosch/Thermador/Gaggenau evaporator/freezer fan). We pull the rear freezer panel and spin the blade by hand; if it won't turn freely or only hums, the motor is replaced. A seized fan reads exactly like a stuck damper from the front of the cabinet, so we confirm which one is dead before ordering rather than parts-cannoning both. Note 00795952 is cross-listed as a fresh-food-side fan on some builds, so we confirm the fan's role by full model/serial.
• A creeping defrost-icing fault presents as fridge-warm-freezer-cold on a single-evaporator built-in: when the defrost heater (12023292) or the evaporator NTC thermistor (11030589) fails, frost slowly packs the evaporator coil and chokes the airflow that feeds the fresh-food duct first. The freezer, sitting right at the coil, still feels cold while the fridge starves. We pull the rear freezer panel; a coil sheathed in white frost confirms it. We meter the heater for continuity (an open heater passes no current) and check the thermistor against its model spec before touching the damper or fan, because a frosted coil mimics an air-path fault.
• A freezer-section NTC reading wrong throws E02 in diagnostics and can leave the fridge warm while the freezer over- or under-cools: if the control mis-reads compartment temperature it mis-regulates the whole single-evaporator air split, so the damper logic and fan duty are wrong and the fresh-food side never gets its share of cold. On this BSH platform the freezer sensor fault is E02 and the fresh-food sensor fault is E01. We meter the evaporator/freezer NTC (genuine part 11030589) and reseat the connector at the upper-compartment harness, because corrosion or a backed-out pin throws the same code and is cheaper than a sensor swap.
• The cheapest, most-missed freezer-works-fridge-warm cause is a tired or torn fresh-food door gasket: the fridge cabinet bleeds cold and pulls in warm humid room air, so it can never hold temperature even though the freezer (sealed behind its own door) stays cold. On the 18-inch Freedom columns the genuine Thermador door seal is 00716383 (size-coded to the cabinet). We check the gasket for set, gaps and a clean magnetic pull and confirm the door is closing square on its hinges before touching the damper or any electronics, because a ~$100 seal is routinely mistaken for a damper or control job on an $8k-plus integrated unit.
• On Thermador French-door bottom-freezers (T36IT-class) the diagnosis splits by architecture: many of these carry individual compressor + evaporator per zone, so a warm-fridge-cold-freezer pattern there is NOT a shared damper but the fresh-food zone's own cooling circuit (its evaporator fan, NTC, or sealed system) failing while the freezer zone runs fine on its independent loop. We verify the unit's architecture by full model/serial first, because chasing a freezer-to-fridge damper on a dual-evaporator build wastes the call. On a true single-evaporator column the damper/fan/defrost path above applies; on a dual-zone French-door we isolate the warm zone's own components.
• If damper, fan, defrost circuit, gasket and sensors all check out, the main control board (E10) is the last suspect: it provides voltage to the fan and steps the damper motor, so a failed board can leave the fresh-food side perpetually warm with no airflow even though the freezer cools. We power down 3-5 minutes to reset; if E10 returns we reseat every harness and rule out a sensor before quoting the model-coded board, since the main board is dealer-ordered and not interchangeable across model codes on these BSH built-ins. We never parts-cannon the board on an integrated unit before confirming the cheaper air-path causes.

Thermador freezer cold but fridge warm in Toronto — the local specifics

• The recurring Toronto pattern on Thermador freezer-works-fridge-warm calls is an air-path failure on the single-evaporator built-ins -- a stuck-closed air damper control assembly or a stalled evaporator fan -- far more often than a sealed-system or compressor fault, which matches what the owner reports across the books rather than any counted figure. The customer almost always reports the freezer making ice and feeling cold while the fresh-food cabinet drifts into the 50s F. A close second is a slowly frosting evaporator coil (defrost circuit) choking the fresh-food duct first. We also see the French-door T36IT-class dual-evaporator builds where the symptom is actually the fresh-food zone's own circuit, not a shared damper -- so we confirm architecture by model/serial before quoting.
• To these calls we bring the air-path kit: the air damper control assembly 00798467, the evaporator fan motor 00672636, the defrost heater 12023292 and the evaporator NTC thermistor 11030589, plus a Freedom-column door gasket 00716383 where the model is common -- the cheap-cause-first parts that resolve most single-evaporator warm-fridge faults. We confirm every number against the full model/serial in the BSH channel before ordering, and we leave the model-coded main control board (E10) for a confirmed second-visit order rather than parts-cannoning it on the first trip.

For the full Thermador refrigerator module — every fault, part number and code — see Thermador refrigerator repair in Toronto, and for the same fault across all brands the refrigerator freezer cold but fridge warm guide.