Frigidaire Refrigerator Repair in Toronto — Not cooling

• SY EF (System / Evaporator Fault) is the signature Frigidaire not-cooling verdict: fridge warms while the freezer stays cold because the main board lost the evaporator fan's RPM (Hall-sensor) feedback, and once airflow stalls for about 60 seconds (zero fan pulses) the board locks cooling and flashes the code. The part is the evaporator fan motor 5303918549 (PartSelect PS3419839 / AppliancePartsPros AP4700070). A frosted blade or an iced Hall sensor mimics a truly dead motor, so we clear any evaporator ice load and spin the blade by hand first; if it turns freely but the board still reads no feedback, the motor is the failed part rather than a defrost problem.
• Defrost-thermostat failure is the most common 'compressor runs, box still warms' Frigidaire pattern: the defrost thermostat/heater kit 5303918202 (AP2150133 / PS469510 / RepairClinic 833603) carries an L47-22F bi-metal that has to sense the coil cold before the heater fires, and when its continuity drops the auto-defrost never melts the coil, frost sheets the evaporator, airflow chokes and cooling fades. The classic field signature is exactly 'freezer cold, refrigerator warm' with icy evaporator coils. We continuity-test both the bi-metal and the heater element before condemning either, and splice the new thermostat with the kit's butt connectors and heat-shrink wraps.
• A total no-cool where neither compressor nor evaporator fan ever start points at the compressor start device, not the fan: the relay-and-overload kit 5304410951 (AP2585033 / PS471679, which replaces 218721106 and 5304407494) boosts the compressor on start and trips it offline on overheat. A click-and-hum with no run, a relay that rattles when shaken, or scorch/arc marks at the overload makes this the part. We confirm the compressor windings ohm to spec before swapping the device, so we are not putting a fresh relay onto a seized compressor.
• Thermistor drift forces the board into the wrong cooling strategy: a refrigerator or freezer sensor reading open shows as OP, shorted shows as SH (per zone), and once the coil is already buried in ice the unit can surface an H1 high-temperature alert (cabinet over ~55F / freezer over ~26F). The catch is that Frigidaire/Electrolux uses more than one sensor curve, so the cross-check is resistance against the chart for the exact sensor in the unit: the 241608501 (PartSelect PS1146084) reads about 16.3K ohms in 32F ice water and roughly 6.2K at 68F, while the 240597203/240597220 10K-NTC family (AP7243155) and the 297110400 (AP3969404 / PS1527511) follow their own published curves. We ohm the suspect thermistor against its own spec before touching the board, since a false-cold reading makes the board short-run the compressor and the box never pulls down.
• No code with a slowly warming box over several days is the adaptive defrost control board: on the twist-on/ADC platform the board is 5303918476 (AP4909015), on the later units the 12-pin 242011001 (AP4560766), and it mistimes or skips the defrost cycle entirely so frost accumulates on the coil even with a healthy heater and thermostat. Because there is no SY-code and no failed component on a meter, we confirm the heater, thermostat and thermistor all read good first, then condemn the board as the timing fault rather than blind-swapping parts.
• Condenser-side overheating is the 'cools, then quietly stops' not-cooling pattern, common on the FFTR top-mount and FFSS side-by-side rental stock: clogged condenser coils plus a weak condenser fan starve the compressor of cooling air, it overheats and the overload trips it offline within hours, then it restarts and repeats. We brush-and-vacuum the condenser, confirm the condenser fan spins freely with winding continuity, and verify the compressor stops cycling on thermal trip before quoting any sealed-system work.
• Kenmore 253.-prefix fridges are Frigidaire-built on this exact platform, so the same 5303918549 evaporator fan, 5303918202 defrost-thermostat kit, 5304410951 relay/overload device and the OP/SH/H1 thermistor diagnosis path resolve their not-cooling calls out of the same parts book, no separate sourcing.

Frigidaire not cooling in Toronto — the local specifics

• The recurring Frigidaire not-cooling pattern we see across Toronto is the 'freezer fine, fridge warm' split that resolves at the evaporator fan (SY EF / 5303918549) or the L47-22F defrost thermostat (5303918202) far more often than at the sealed system - on the high-volume FFTR top-mount and FFSS side-by-side rental stock these two parts plus a condenser cleaning close most calls, while a true relay/overload (5304410951) no-start is the dramatic-but-rarer total-dead version. Qualitative observation only, not a job count.
• We bring the not-cooling kit to these calls: the 5303918549 evaporator fan motor, the 5303918202 defrost-thermostat/heater kit, the 5304410951 compressor relay/overload device, and a 240597203/240597220-family thermistor so we can ohm-and-replace a OP/SH/H1 sensor on the spot - plus a brush and vacuum for the condenser, since a clogged coil is the first thing we rule out before quoting any part.

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 not cooling guide.