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

• The first honest move on a Miele 'fridge runs constantly' call is to confirm a Super function isn't simply still latched, because Miele documents both SuperCool and SuperFrost as deliberately overriding normal temperature control to run the unit at full power for a fixed window. On KFN freestanding bottom-mounts (e.g. KFN 9755 iDE) the manual times SuperCool to switch off automatically after about 6 hours and SuperFrost after roughly 30-60 hours depending on the load (mieleusa.com / Miele KFN 9755 iDE operating instructions). A lit Super LED with a box that 'never stops' is normal behaviour, not a fault, so we verify the function has cleared (or cancel it) before condemning a single part - replacing a sensor on a unit that is correctly running its Super cycle is the classic false call.
• The running-constantly fault that is genuinely electronic and unique to this symptom is the ambient/condenser NTC under F122, because on Miele's platform that sensor sets compressor SPEED, not just an alarm: the starting and running speed is governed by the ambient-air NTC, so a probe that reads falsely low (or open) makes the board hold the compressor on continuously or at the wrong speed and the box overcools. F122 is Miele's documented ambient air-temperature sensor fault, and the part lives on the condenser at the bottom-left behind the lower kick-plate (Miele service literature). We pull the kick-plate, meter that condenser-area NTC against its room-temperature window before condemning the board, since on a runs-constantly call this is the sensor that actually drives the compressor.
• An F1 or F2 NTC fault is the running-constantly cause that pairs with overcooling-then-icing: when the fridge-cabinet sensor (F1) or evaporator sensor (F2) reads warmer than reality, the board never satisfies the setpoint, so the compressor runs nonstop while the evaporator eventually sheets over with frost. Miele literature splits which F-number names which probe by service generation, so we map the displayed code to the unit's own table first, then ohm the matching genuine 4.7kOhm NTC 7323301 (freezer/fridge kit 7323302; cross-refs 959020600 / H272037) against the ~4.7-5.3 kOhm room-temperature window. On that vintage we fit Miele's supersession repair kit 10321751 (replaces 10321750) rather than a loose probe.
• A dirty condenser or blocked ventilation gaps is the most common non-electronic runs-constantly cause and the cheapest real fix: Miele's own troubleshooting names covered/dusty ventilation gaps in the housing unit as a reason the compressor runs continuously (Miele GB compressor-runs-constantly support page), and the KFN manuals call for cleaning the ventilation slits and the exterior coils behind the lower grille/kick-plate on a regular schedule. Choked coils can't reject heat, so the compressor runs long to hold setpoint. We pull the lower kick-plate, vacuum and brush the condenser and the ventilation slits, and confirm the condenser fan free-spins before quoting anything, because in dusty or pet-hair Toronto suites a clogged coil mimics a failing sealed system at a fraction of the cost.
• A tired magnetic door seal is the purely mechanical runs-constantly cause that needs no electronics: once the perimeter no longer sweeps, warm humid room air leaks in continuously, the box can never reach setpoint and the compressor runs long while frost builds on the evaporator. Miele also documents the doors-not-properly-closed condition as a compressor-runs-constantly cause. 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 any sealed-system conversation, because a sweating or sagging door reads as a hard-working compressor but is mechanical.
• On 10-plus-year MasterCool built-in columns (K/KF 1801/1901) and older KFN units, a compressor that runs nonstop but only slowly pulls the box down points at sealed-system charge drift or an inefficient compressor rather than a sensor or a coil - Miele's own guidance for a constantly-running, loud-buzzing compressor where the temperature only decreases routes this to Miele technical service. This is refrigerant-side diagnosis, so it stays Miele Canada's call and routes factory-direct; we confirm it only after ruling out a latched Super function, the F122 ambient NTC, the F1/F2 cabinet/evaporator NTC, a fouled condenser and a worn door seal, and quote it per serial through the factory channel rather than guessing a sealed-system fault first.

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

• The recurring Toronto pattern on a Miele runs-constantly call is two-sided: a real share clear at the simplest end - a SuperCool/SuperFrost function still latched (normal full-power behaviour, not a fault) or a dust- and pet-hair-fouled condenser behind the kick-plate in a built-in column - while the genuine electronic ones land on the ambient/condenser NTC (F122) that governs compressor speed or an F1/F2 cabinet/evaporator NTC reading warm so the box never satisfies and frosts the coil. The honest split matters here: we rule out the free fixes (clear the Super cycle, clean the coil and ventilation slits, reseat the door seal) before metering a sensor, and we route a slow-pull-down, loud-buzzing 10-plus-year MasterCool to Miele Canada for sealed-system diagnosis rather than throwing parts.
• We carry to these calls the genuine 4.7kOhm NTC 7323301 and freezer/fridge kit 7323302 (plus the supersession repair kit 10321751), a meter to ohm the ambient/condenser F122 sensor behind the kick-plate, a coil brush and vacuum to clear the condenser and ventilation slits, and the magnetic door-seal fitting kit 7625460 with the seal ordered to serial (e.g. 5411711). Coded boards and sealed-system parts are not van stock - they are confirmed by serial and ordered factory-direct through Miele Canada.

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 running constantly / never shuts off guide.