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REFRIGERATION

Troubleshooting

Evaporator or condenser fan not working

Most commercial refrigerators have two fans. The evaporator fan inside circulates cold air around the food. The condenser fan outside pushes room air across the hot coil so the compressor can reject heat. When the evaporator fan stops, the cabinet warms unevenly and the coil ices up. When the condenser fan stops, pressures and temperatures climb and the compressor trips on overload. Not every stopped fan is faulty, though. Evaporator fans often pause when the door opens, during defrost, and for a short delay after defrost. Know the difference before you call. A fan that is only slow can be as harmful as one that is dead, because airflow drops well before the blade stops.

First, check these

  1. Close the door fully and wait a minute. Many evaporator fans stop when the door switch senses the door is open.
  2. Check whether the unit is in defrost. The fan normally stops during defrost and may wait a few minutes after it ends.
  3. Listen at the machine compartment while the compressor runs. The condenser fan should run whenever the compressor does on most units.
  4. With power isolated, look for ice, wrapping film or debris jamming the blade.

Likely causes

  1. 1. Normal pause: door open, defrost or post-defrost delay

    You can check this

    Signs: Fan resumes after the door is closed or a few minutes after defrost ends.

    Fix: No action needed. Train staff not to judge the fan with the door open.

  2. 2. Blade blocked by ice or debris

    You can check this

    Signs: Fan hums but does not turn; ice around the fan shroud, or plastic film, labels or dust caught in the blade.

    Fix: Isolate power, remove debris you can reach without tools, and defrost if ice is the cause. If ice keeps returning, have the defrost system checked.

  3. 3. Blade loose, cracked or out of balance

    Technician job

    Signs: Fan motor runs but airflow is weak, blade wobbles, clicks against the shroud, or slips on its shaft.

    Fix: Isolate power and check the blade by hand. A loose or cracked blade should be replaced or re-secured by a technician so it does not hit the coil or shroud.

  4. 4. Door switch faulty

    Technician job

    Signs: Evaporator fan never starts even with the door closed, or the interior light stays on.

    Fix: A technician should test and replace the door switch.

  5. 5. Fan motor failed

    Technician job

    Signs: No hum, blade turns freely by hand when isolated but does not run when powered; or blade stiff with worn bearings.

    Fix: A technician replaces the fan motor. Condenser fan failures should be treated as urgent because they lead to compressor overheating.

  6. 6. Controller output or wiring fault

    Technician job

    Signs: Fan works when tested directly but the controller never switches it on; loose or burnt connections.

    Fix: A technician should check the controller, fan delay settings and wiring.

When to call a technician

Call promptly if the condenser fan is not running while the compressor runs; switch the unit off to protect the compressor and move stock. Call for an evaporator fan if it stays off with the door closed and no defrost in progress, or if it grinds. Tell the technician which fan, and whether it hums, turns slowly or is completely silent.

Isolate power before putting fingers near any fan blade; fans start without warning when the controller calls for cooling. Do not remove electrical covers. Hydrocarbon (R290 or R600a) systems need trained technicians for any sealed-system work.

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