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REFRIGERATION

Troubleshooting

Commercial refrigerator not cooling

A refrigerator that has stopped holding +2 to +8 °C puts stock at risk within hours, so work fast but in order. Most 'not cooling' calls in Indian kitchens and shops turn out to be airflow, dirt or settings rather than a dead compressor. The condenser has to dump heat into the room; in a 43 °C kitchen full of grease and flour dust it is often the first thing to choke. If chilled food has been above 5 °C for more than a couple of hours, or you cannot tell how long, treat it as a food-safety problem first and a repair problem second.

First, check these

  1. Read the cabinet temperature with a separate probe thermometer placed in a glass of water on a middle shelf, not just the display. This tells you whether the problem is real and how bad it is.
  2. Confirm the unit has power and the controller is on, the setpoint has not been changed, and the display is not showing a defrost symbol. A unit in defrost will read warm for a short time.
  3. Look at the condenser grille (usually at the bottom or top). If it is furred with dust or grease, or if boxes are stacked against it, airflow is the likely culprit.
  4. Check that the door closes fully and the gasket seals all round. A door held open by a tray or a sagging hinge lets warm, humid air pour in.
  5. Look inside: are the fan outlets and return grilles blocked by stock or cling-wrapped trays? Cold air needs a path around the food.

Likely causes

  1. 1. Dirty or blocked condenser

    You can check this

    Signs: Compressor runs for long periods, the area around the condenser feels very hot, the grille is visibly dusty or greasy, cooling is worst in the afternoon heat.

    Fix: Switch off and isolate power, then brush or vacuum the condenser fins gently along their direction. Clear at least the gap the manual specifies around the vents. In kitchens with heavy frying, clean every two to four weeks rather than waiting for a service.

  2. 2. Poor ventilation or very high room temperature

    You can check this

    Signs: Unit is pushed into a corner, next to a tandoor, fryer or oven, or in a closed shop without air movement. Performance improves at night and drops by midday.

    Fix: Move the unit away from heat sources, leave clearance at the vents, and improve room ventilation. Units rated for high ambient cope better, but no refrigerator can work well with its own hot air recirculating into the condenser.

  3. 3. Overloading or blocked internal airflow

    You can check this

    Signs: Cabinet is packed to the walls, warm food was loaded recently, top shelf or door side is warmer than the rest.

    Fix: Leave space between items and the back wall, keep fan outlets clear, and cool cooked food before it goes in. Load in smaller batches during service peaks.

  4. 4. Evaporator iced up or evaporator fan stopped

    Technician job

    Signs: Thick ice visible on the evaporator coil inside, weak or no air from the fan outlet, the compressor runs but the cabinet stays warm.

    Fix: A manual defrost (power off, door open, towels down) can restore cooling temporarily. If ice returns within days, the defrost heater, termination sensor, controller or fan motor needs a technician.

  5. 5. Condenser fan failed

    Technician job

    Signs: Compressor hums but no air blows from the condenser; the compressor housing is very hot and may cut out on overload and restart repeatedly.

    Fix: Isolate power and call a technician to test and replace the fan motor. Do not run the unit for long with a dead condenser fan; it overheats the compressor.

  6. 6. Refrigerant leak or compressor fault

    Technician job

    Signs: Cooling has declined gradually over weeks despite a clean condenser, frost only on part of the evaporator, oily patches on pipework, or the compressor will not run at all.

    Fix: This is a sealed-system job. A technician must find and repair the leak or replace the faulty part, then evacuate and recharge to the rating plate. Topping up gas without a repair just delays the next failure.

When to call a technician

Call a technician if cooling does not recover within a couple of hours after you have cleaned the condenser, cleared airflow and confirmed settings, if the condenser fan is not turning, if ice keeps rebuilding on the evaporator, or if you hear the compressor click on and off without running. Before the visit, note the temperatures you measured, when the problem began, any error code on the display and whether it got worse in the afternoon. That history shortens diagnosis. Meanwhile move high-risk stock such as dairy, meat and cooked food to another cold unit.

Always switch off and isolate power at the socket or MCB before cleaning the condenser or touching anything behind a grille. Many modern units use hydrocarbon refrigerant (R290 or R600a, shown on the rating plate), which is flammable; only a trained technician should open the sealed system or work near it with tools or flames.

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