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

• Dirty condenser coils are the number-one Frigidaire 'runs constantly / never shuts off' cause and the cheapest real fix: when the coils blanket over with Toronto apartment dust and pet hair they can't shed compressor heat, so the box can't reach setpoint and the compressor runs nonstop trying to catch up. RepairClinic's 'Frigidaire refrigerator runs constantly' guide names dirty condenser coils as a primary cause. On the FFTR top-mount and FFSS side-by-side rental stock the coils sit at the base behind the toe-kick; we brush-and-vacuum them and re-check run time before metering any electrical part, because a new part dropped onto a dust-blanketed coil just re-loads and the unit keeps running.
• A weak or stalled condenser fan motor turns a clean-coil job into a runs-constantly job: the condenser fan moves air across the compressor and condenser to shed heat, and when it slows or seizes the compressor runs hot and never cycles off. The genuine Frigidaire OEM condenser fan motor kit is 5303918774 (PartSelect PS11766772) - note this is the CONDENSER fan, distinct from the evaporator fan 5303918549 that throws the SY EF (System Evaporator Fault) code. We confirm the blade spins freely and meter the windings for continuity; a motor that runs slow, hums, or reads open gets replaced, since a compressor starved of condenser airflow will run continuously until it eventually overheats and trips its overload.
• Thermistor drift is the classic electronic-model runs-constantly fault: the refrigerator/freezer thermistor feeds temperature to the main board, and a sensor reading falsely warm makes the board call for cooling that never ends, so the compressor and evaporator fan run continuously. The freezer thermistor 241608501 (PartSelect PS1146084) reads about 16.3K ohms in 32F ice water and roughly 6.2K at 68F - the published spec curve for this exact part. RepairClinic covers the thermistor as a runs-constantly part on its diagnosis. We ohm the suspect sensor against that curve before touching the board; a reading far off spec condemns the thermistor, and a board-level OP (sensor open) or SH (sensor shorted) code per zone, or an H1 high-temp alert, points the same way.
• A failed defrost thermostat or open defrost heater makes the box run constantly the indirect way: when the auto-defrost never melts the coil, frost sheets the evaporator, airflow chokes, the box can't pull down, and the compressor runs nonstop chasing a setpoint the iced coil won't let it reach. The defrost thermostat/heater kit 5303918202 (AP2150133 / PS469510) carries an L47-22F bi-metal, and the Calrod heater element 242044020 (PartSelect PS3408665 / AppliancePartsPros AP4567873; cross-ref 242044008) goes open and stops melting the coil. We continuity-test both the bi-metal and the heater element - a coil that re-ices after a manual thaw is heat not reaching the fins, never a refrigerant fault - because both parts present as a runs-constantly box, not just a frost complaint.
• Worn or compression-set door gaskets are a quiet runs-constantly driver and a common Toronto call on older FFTR and FFSS units: a gasket that no longer seals lets cold air leak out and warm room air in, so the compressor runs far longer than it should to hold temperature. A door not sealing is a recognized runs-constantly cause. We run a dollar-bill seal test around the perimeter, confirm the doors are square and not held ajar by an overloaded bin, and replace the model-coded perimeter gasket if it's set or torn before condemning any electrical part - on a French-door or side-by-side a leaking gasket reads identical to a weak compressor until the seal is checked.
• The adaptive defrost control board is the no-code runs-constantly cause when every metered component reads good: on the twist-on/ADC IV platform the board is 5303918476 (AP4909015), and on later units the 12-pin 242011001 (AP4560766). When the board mistimes or skips defrost, frost slowly builds on the coil, airflow fades, and the compressor runs progressively longer over several days even though the heater (242044020), thermostat (5303918202) and thermistor all read good. Because there is no failed component on a meter and no SY-code, we confirm those three read good first, then condemn the board as the timing fault rather than blind-swapping parts.
• A weak compressor is the runs-constantly diagnosis of exclusion, separated from the cheap fixes on the first visit: once dirty coils, the condenser fan 5303918774, the thermistor 241608501, the defrost circuit (5303918202 / 242044020) and the door seal all check good and the box still won't pull down, a tired compressor that can't build capacity runs nonstop without ever satisfying setpoint. RepairClinic places a weak compressor at the end of the runs-constantly chain, after the fans and thermistor are ruled out. We confirm the start relay/overload 5304410951 (AP2585033 / PS471679) and the windings ohm to spec first; sealed-system and compressor work is legally TSSA/313A-gated in Ontario and is never a parts-swap, so we never quote it until every airflow and electrical fault above is ruled out.

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

• The recurring Frigidaire-in-Toronto runs-constantly pattern is a dust-loaded base condenser plus a tired or slow condenser fan on FFTR top-mounts and FFSS side-by-sides in rental and high-rise stock - the compressor runs nonstop because it can't shed heat, not because the sealed system is failing. The second recurring pattern is the iced-coil runs-constantly on electronic Gallery models, where a failed defrost thermostat (5303918202) or open heater (242044020) leaves the evaporator frosted so the box never pulls down and the compressor never cycles off.
• We carry the 5303918202 defrost thermostat/heater kit, the 242044020 defrost heater, the 241608501 thermistor and a coil brush/vacuum to these calls, plus the 5304410951 start-relay/overload, so a dirty-coil-and-fan or iced-coil runs-constantly verdict closes in one visit; the condenser fan motor 5303918774 and a model-coded door gasket are pre-confirmed against the model/serial and ordered when the fan or the seal is the cause.

For the full Frigidaire refrigerator module — every fault, part number and code — see Frigidaire refrigerator repair in Toronto, and for the same fault across all brands the refrigerator running constantly / never shuts off guide.