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REFRIGERATION

Troubleshooting

Refrigerator making unusual noise

Commercial refrigerators are never silent. The compressor hums, fans whirr, refrigerant gurgles as it moves, and plastic parts tick as they expand and contract around defrost. What matters is a new or changed sound. A rattle that started last week, a grinding fan or a loud knock when the compressor stops are early warnings that are cheap to deal with now and expensive later. In busy kitchens noise often comes from simple things: a tray touching the back panel, a loose grille or a unit standing on an uneven floor.

First, check these

  1. Pin down when the noise happens: only when the compressor runs, when the fan runs, during defrost, or when the door opens.
  2. Locate it: inside the cabinet near the fan, at the machine compartment, or from panels and shelves.
  3. Press lightly on panels, grilles and shelves while the noise is happening. If it stops, something is loose.
  4. Check the unit stands level and does not rock, and that nothing is touching the back or sides.

Likely causes

  1. 1. Normal operating sounds

    You can check this

    Signs: Gurgling or trickling after the compressor starts or stops, ticking during and after defrost, a soft click when the controller switches.

    Fix: These are refrigerant moving and parts expanding as they warm or cool. No action needed unless the sound is new, much louder or comes with poor cooling.

  2. 2. Loose panels, grilles, shelves or items touching the unit

    You can check this

    Signs: Rattle or buzz that changes when you press a panel or move something nearby.

    Fix: Tighten accessible screws, re-seat shelves and grilles, and keep items off the top and away from the back of the unit.

  3. 3. Unit not level or castors unlocked

    You can check this

    Signs: Vibration noise, unit rocks when touched, louder on tiled or uneven floors.

    Fix: Level with the adjustable feet and lock castors. Anti-vibration pads can help on hard floors.

  4. 4. Fan blade hitting ice or debris

    You can check this

    Signs: Scraping or ticking from the evaporator fan, often with ice build-up, or from the condenser fan with dust or a fallen label.

    Fix: Isolate power, clear debris you can reach without tools, and defrost if ice is the problem. Recurring ice needs the defrost system checked.

  5. 5. Worn fan motor bearings

    Technician job

    Signs: Grinding or howling from a fan that gets louder over weeks; blade wobbles or turns stiffly by hand when power is off.

    Fix: A technician should replace the fan motor before it seizes.

  6. 6. Pipework or compressor mounts vibrating

    Technician job

    Signs: Rattle from the machine compartment only when the compressor runs, or a knock at start or stop.

    Fix: A technician can secure pipe clips and replace worn rubber mounts. Do not bend refrigerant pipes yourself.

  7. 7. Compressor internal wear

    Technician job

    Signs: Loud knocking, clanking or a harsh metallic sound from the compressor itself, often with poor cooling.

    Fix: Needs a technician diagnosis; it may point to a failing compressor.

When to call a technician

Call a technician for grinding fans, metallic knocking from the compressor, any noise with poor cooling or tripping, or a sound accompanied by a burning smell. Record a short phone video of the noise; it helps the technician bring the right parts.

Isolate power before reaching near any fan. Fan blades can start without warning when the controller calls for cooling. Do not remove machine compartment panels or touch refrigerant pipes; hydrocarbon (R290 or R600a) systems are for trained technicians only.

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