Miele Refrigerator Repair in Toronto — Freezer cold but fridge warm

• The textbook freezer-cold-but-fridge-warm signature on Miele KFN freestanding bottom-mounts is an iced-over evaporator that jams the circulation fan: the compressor and freezer hold fine, but a frost slab on the rear evaporator stops the fan that pushes cold air up into the fresh-food cabinet, so the fridge slowly warms while the freezer stays cold. This is a defrost/airflow fault, not a compressor code. We pull the rear freezer panel, melt the ice off the evaporator and fan blade, and confirm the fan free-spins and the defrost circuit that governs it works before reassembly, because a box that just gets chipped re-ices within weeks and the warm-fridge complaint returns.
• The most common electronic cause behind that iced evaporator is a drifted evaporator NTC sensor that mistimes the defrost cycle, and on KFN-generation literature it surfaces as F2 (fridge-compartment evaporator-sensor fault). With the probe drifting, the board never fires defrost on time, the coil sheets over and the fridge warms while the freezer holds. The genuine part is the 4.7kOhm NTC sensor 7323301 (freezer/fridge kit 7323302), and Miele's current factory catalogue ships it as the Repair kit Temperature sensor 10321751 (listed on mieleusa.com with a 4.7kOhm probe + connection box; it supersedes 10321750 and cross-references 7323300/7323301/7323302). We ohm the probe at the plug against the ~4.7-5.3 kOhm room-temperature window before condemning it.
• Generation variance matters on this exact symptom: some Miele service charts read F1 as the fridge-cabinet (fresh-food) sensor and F2 as the evaporator sensor, while other charts read F1 as the evaporator sensor and F2 as the condenser sensor. A warm fresh-food section with the freezer cold almost always resolves at whichever NTC governs the fridge airflow on that unit's table (7323301 / 7323302 / 10321751), so we map the displayed code to the unit's own service generation first, then ohm the matching probe rather than trusting a generic code list. The ambient/condenser sensor is its own separate part under F122 and is not the airflow-split culprit.
• When no fan or sensor is at fault, the air damper that meters cold air from the freezer side into the fridge cabinet is the next suspect on a freezer-cold/fridge-warm Miele: the motorized flap behind the fridge-section vent sticks shut (often iced or debris-bound) and no cold air transfers even though the fan spins and the freezer is fine. We set the freezer to its coldest setting, watch whether the vent flap drives open on a temperature call, and free or clean the damper before quoting anything, since a stuck damper mimics a dead fan but is a different, cheaper fix.
• Defrost-drain icing is the freezer-cold/fridge-warm cause that hides as a leak: on KFN units the drain at the back of the freezer floor plugs with food debris, slime or ice, defrost melt has nowhere to go, it refreezes into a slab over the evaporator, chokes the airflow up to the fridge, and the fresh-food box warms - ending as water tracking down the rear wall to under the crisper drawers. We flush the drain channel clear to the evaporation/drip pan over the compressor and confirm flow rather than just chipping the visible ice, because a half-cleared drain re-ices and the warm-fridge complaint comes right back.
• A tired magnetic door seal on the fridge half is the purely mechanical freezer-cold/fridge-warm cause that needs no electronics: once the perimeter no longer sweeps, warm humid room air bleeds into the fresh-food cabinet, the moisture freezes on the evaporator and the box runs long without ever holding fridge temperature while the better-sealed freezer half stays cold. The seal halves are model-coded (e.g. 5411711) and need Miele's magnetic-door-seal fitting kit 7625460 plus the correct adhesive, so we confirm the exact seal by serial. We reseat or replace the gasket and check hinge sag before touching the sealed defrost circuit, because a sweating fridge door reads as not-cooling but is mechanical.
• Coded defrost-heater and sealed-system faults behind a persistently warm fridge remain Miele Canada's call and route factory-direct; the airflow-split fixes an out-of-warranty independent actually closes are the iced evaporator/jammed fan, the F2 / F1 evaporator NTC (7323301 / 7323302 / repair kit 10321751), the stuck air damper, the iced defrost drain and the fridge-side magnetic seal (5411711 + 7625460 kit). Anything that points back to the control board after those are ruled out gets quoted per serial through the factory channel.

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

• The recurring Toronto pattern on Miele freezer-cold/fridge-warm calls is that the freezer reads perfect on the customer's display, so owners assume the cooling system is fine and only notice the fridge creeping warm over days - which masks an iced evaporator and a jammed circulation fan, or an F2 / F1 evaporator NTC that has quietly drifted and stopped timing the defrost. We routinely find the box already manually-defrosted once by the owner (it 'fixed itself' for a few days), which is the tell that the sensor or defrost circuit, not the compressor, is the real fault on these.
• We carry the parts that actually close this airflow-split fault to the call: the genuine 4.7kOhm NTC evaporator sensor (7323301 / 7323302) and the Miele Repair kit Temperature sensor 10321751, plus the magnetic-door-seal fitting kit 7625460 for a sweating fridge door, and the tools to thaw the evaporator, free a stuck air damper and flush the iced defrost drain. Coded boards and sealed-system parts we quote per serial through Miele Canada rather than carry.

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