KitchenAid Refrigerator Repair in Toronto — Not cooling

• On the freestanding French-door/counter-depth line (KRFF/KRFC, the premium-trim Whirlpool platform), the classic not-cooling presentation is freezer cold / fridge warm, and the failed part is the evaporator fan motor. The fan sits behind the freezer rear cover and pushes the cold air forward to the fresh-food section; when it seizes or loses its winding, the freezer can still hold while the refrigerator climbs. On this French-door platform the fan motor is the Whirlpool W11024089 (PartSelect PS11773024, replacing W10199049/W10904013) — NOT the older W10189703/WPW10189703, which fits the legacy KitchenAid top-mount/side-by-side line (KTRC/KTRS), so we confirm the exact fan motor by model/serial before quoting. We spin the blade by hand and ring out the motor windings for continuity before swapping it, because a frosted-jammed fan and a dead motor present identically.
• When the whole evaporator ices over and the fridge slowly warms, the defrost circuit is the root cause on this platform, and it is two parts that fail the same way. The bimetal defrost thermostat WPW10225581 clips to the evaporator coil and must close cold so the defrost heater assembly WPW10436849 (PartSelect PS11754723, the genuine Whirlpool element for the KRFF300E/KFFS20EY series) can fire and melt each cycle's frost. If the thermostat opens or the heater burns out, auto-defrost never completes, the coil sheets over, airflow chokes, and the box stops cooling. We continuity-test the thermostat at the coil AND the heater element separately before condemning either.
• On single-evaporator freestanding units a fridge-warm-but-freezer-fine complaint with a clear coil points at the air damper, not the defrost circuit: the motorized damper that meters freezer air into the fresh-food section sticks closed, so cold air never reaches the fridge. KitchenAid's own diagnostic mode confirms this in service test 3, which cycles the refrigerator/freezer evaporator fans and the air-baffle motor. We drive the baffle in diagnostics before ordering a damper assembly, so a stuck flap isn't mistaken for a sealed-system fault.
• A drifting thermistor makes the board run the box wrong and is the quiet not-cooling cause on electronic models, often surfacing as an E1 (open thermistor) or E2 (shorted thermistor) fault — note that E3 is NOT a sensor code on KitchenAid refrigerators (it flags a user-interface/software mismatch). KitchenAid diagnostic service test 1 reports the freezer thermistor resistance as a result code: 01 = pass, 02 = open, 03 = shorted. We read the test-1 code off the temperature display and ohm the suspect sensor against spec before touching the control board, because an open or shorted thermistor feeds the board bad temperature data and will mimic a cooling failure.
• On a dead-cold box that won't run at all, the compressor start device is the part: the start relay and capacitor W10613606 (replaces W10416065 / PS8746522) serves the compressors used across the freestanding KRMF/KRFF line. A rattle when shaken or an open between the relay terminals confirms it; a buzzing-then-shutting-off compressor that restarts every few minutes is the overload tripping. We confirm the relay before ever condemning the compressor, since a cheap relay failure looks exactly like a dead compressor.
• On the 42-48\" built-in line (KSSC/KBSD/KSSV/KSSS) a unit that is dead or erratically not-cooling is its own diagnosis: the mid-2000s main control / ACU board W10219463 (and its sibling W10219462) is notorious for failing the evaporator-fan, condenser-fan and defrost outputs, and Whirlpool's own resolution is a model-specific service kit. Because the original board became scarce, board-repair/exchange services (FixYourBoard, Circuit Board Medics) now handle it. We price the board path BEFORE condemning the sealed system on any dead built-in, because the board failure mimics a sealed-system verdict.
• JennAir built-ins of the same era share this architecture and the same W10219463 board story, so an erratic-cooling JennAir column gets the identical board-first diagnosis. On panel-ready built-ins we also book extra access time, since cabinetry-integrated removal adds to the visit before any cooling part can be reached.

KitchenAid not cooling in Toronto — the local specifics

• The recurring Toronto pattern on KitchenAid not-cooling splits cleanly by build type: freestanding KRFF/KRFC French-door calls land most often on the evaporator fan motor or the defrost circuit (WPW10225581 thermostat / WPW10436849 heater) presenting as freezer-cold-fridge-warm, while the 42-48\" built-in KSSC/KBSD calls keep coming back to the W10219463 control board mimicking a sealed-system failure. We run KitchenAid diagnostic mode (service test 1 for the freezer thermistor, test 3 for the fans and air baffle) on arrival so we separate a stuck damper or open thermistor from a true defrost or board fault on the first visit.
• We carry the freestanding cooling parts to these calls — the French-door evaporator fan motor W11024089/PS11773024, bimetal defrost thermostat WPW10225581, defrost heater assembly WPW10436849 (PS11754723), and the W10613606 start relay/capacitor — plus an air damper assembly for the fridge-warm-freezer-fine units. For a confirmed built-in board fault we don't carry the W10219463 on the truck; we capture the model and serial, then stage the board-repair/exchange or the model-specific service kit for the follow-up.

For the full KitchenAid refrigerator module — every fault, part number and code — see KitchenAid refrigerator repair in Toronto, and for the same fault across all brands the refrigerator not cooling guide.