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

• On the freestanding French-door/counter-depth line (KRFF/KRFC, the premium-trim Whirlpool platform), the number-one reason a KitchenAid runs constantly is heat it cannot shed: a dust-and-pet-hair-blanketed condenser coil plus a slowing condenser fan. With the coil insulated and the fan dragging, the refrigerant never rejects enough heat, the box never reaches setpoint, and the compressor never cycles off. We pull the lower rear access panel, vacuum/brush the coil, and turn the condenser fan blade by hand looking for a seized bushing or an obstruction before condemning anything electrical, because RepairClinic and KitchenAid's own runs-constantly literature both put dirty coils and a weak condenser fan at the top of this list. This is the first thing we rule out on any constant-run KitchenAid before pricing a sealed-system or board path.
• A drifting thermistor that reads falsely WARM is the classic electronic-model cause of constant running: the NTC sensor tells the board the box is too warm, so the board calls cooling without end. KitchenAid surfaces a bad sensor as E1 (open thermistor) or E2 (shorted thermistor), and RepairClinic/PartSelect both document that a defective thermistor makes the fridge 'cool continuously' / 'run the compressor nonstop.' Diagnostic service test 1 reports the FREEZER thermistor as a result code (01 = pass, 02 = open, 03 = shorted) and service test 2 does the same for the FRESH-FOOD sensor. We read the test-1/test-2 codes off the temperature display and ohm the suspect NTC against spec (roughly 5,000-25,000 ohms across its cold range) before touching the board, because an out-of-cal sensor and a dead board both present as 'never shuts off.'
• When the box runs nonstop AND ices over, the defrost circuit is the root cause, not a thermostat-calling fault: 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 series) can fire and clear each cycle's frost. If the bimetal opens or the heater burns out, auto-defrost never completes, the coil sheets over, airflow chokes, and the compressor runs continuously chasing a setpoint a frosted coil can't deliver. KitchenAid's service mode separates them: test 6 reads the bimetal status (01 = closed, 02 = open) and test 38 forces a defrost so we watch the heater actually energize. We continuity-test thermostat and heater separately before condemning either.
• A door gasket that has compression-set, twisted, or torn pulls humid Toronto room air into the cabinet and forces the compressor to run constantly to fight the leak. KitchenAid's own product help documents that a worn seal makes the refrigerator 'run longer than normal' and build frost. The model-correct fresh-food door gasket on the KRFF305 housing is W10830162 (genuine Whirlpool seal, replacing W10179332/W10199876/W10443225), and on French doors we also check for sagging hinges/door supports that leave a door not closing flush. We run a dollar-bill drag test around the perimeter and inspect the gasket for set/tears before quoting one, because a marginal seal and a sealed-system loss both end as 'never stops running.'
• On single-evaporator freestanding units, an air damper stuck OPEN dumps freezer air into the fresh-food box continuously, so the fridge over-cools, the freezer struggles to hold, and the compressor runs without rest trying to satisfy both. The genuine part is the air damper control assembly WPW10594329 (PartSelect PS11756641 / AppliancePartsPros AP6023299), and a damper motor cycling nonstop or jammed open is documented on this platform. KitchenAid service test 3 cycles the evaporator fans AND the air-baffle (damper) motor, so we drive the baffle in diagnostics and watch it open and close before ordering the WPW10594329 - a stuck-open flap reads identically to a board that won't stop calling cold.
• Frost that builds over DAYS with a good thermostat and a good heater, no display code, and a compressor that never rests points at the main control board mistiming the adaptive defrost cycle - or sending continuous voltage to the compressor outright. The control runs the adaptive defrost timer (service test 7 reports ADC mode: 01 = adaptive on, 02 = basic 8-hour schedule), and RepairClinic flags the temperature-control board as commonly MISdiagnosed because it 'may send continuous voltage to the compressor or fan motors.' We prove the coil, condenser fan, thermistor (tests 1/2), damper (test 3), bimetal (test 6) and heater (test 38) good FIRST and never lead with the most expensive part on a constant-run KitchenAid.
• Free-fix and mode states we clear before tools come out: a setpoint cranked to its coldest, a fridge stuffed wall-to-wall (blocked internal vents), or a unit parked tight against a wall with no rear clearance all make a healthy KitchenAid run nonstop. KitchenAid also notes that after a power event or a door left ajar the box runs hard for hours to recover - normal behaviour, not a fault. We confirm setpoint, vent clearance, rear/side air gap and recent door/power history before quoting any part, since an over-set or boxed-in fridge and a failing compressor both present as 'it just runs and runs.'

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

• The recurring Toronto pattern on constant-run KitchenAid French-door units is a two-parter we see again and again: a dust-and-pet-hair-packed condenser coil with a tired condenser fan, paired with a gasket or damper leak that the box can never quite overcome - so the compressor never cycles off. On electronic models the quieter repeat is a falsely-warm thermistor (E1/E2) making the board call cooling endlessly, which homeowners read as 'it runs all day' long before they notice a temperature problem. Built-ins of this era instead trace constant/erratic running back to the W10219463-generation board.
• We roll to these calls with a coil brush/vacuum and the platform's constant-run high-runners on the truck: the W10830162 fresh-food gasket, the WPW10594329 air damper assembly, freezer/fresh-food thermistors, the WPW10225581 bimetal defrost thermostat and WPW10436849 defrost heater, plus an EDR4RXD1 filter and the W10613606 start relay/capacitor - and we run KitchenAid service tests 1/2 (thermistors), 3 (fans + baffle), 6 (bimetal), 38 (forced defrost) and 7 (adaptive defrost) on site to land the verdict before ordering.

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 running constantly / never shuts off guide.