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REFRIGERATION

Troubleshooting

Compressor overheating or very hot to touch

Compressors run hot by design; the shell is often too warm to hold a hand on comfortably. Overheating is different. It shows up as the compressor cutting out on its thermal overload, restarting later, cutting out again, and cooling falling behind. A compressor rejects heat through the condenser and is partly cooled by the returning refrigerant gas. Anything that blocks the first or reduces the second makes it run hotter. In India the usual culprits are 40 °C-plus kitchens, greasy condensers, cramped installations and low voltage, which forces the motor to draw more current. Repeated overheating breaks down the oil and the winding insulation, so fixing the cause early saves the compressor.

First, check these

  1. Check for clearances. Is the unit pushed against a wall, under a hot counter, or next to a fryer, oven, tandoor or another unit's exhaust?
  2. Look at the condenser coil and grille for dust, lint, flour or grease build-up.
  3. Confirm the condenser fan is running whenever the compressor runs. Listen and look through the grille.
  4. Note whether cut-outs happen in the hottest part of the day or when the supply voltage is low.

Likely causes

  1. 1. Dirty condenser coil

    You can check this

    Signs: Visible fluff or grease, hot air not flowing freely, problem worsened gradually.

    Fix: Isolate power, brush and vacuum the coil, and degrease if needed with a non-corrosive cleaner suitable for aluminium fins. Set a cleaning routine based on your kitchen's grease and dust levels.

  2. 2. Restricted ventilation or hot location

    You can check this

    Signs: Unit enclosed in joinery without vents, back against a wall, near cooking equipment, room above about 40 °C.

    Fix: Give the unit the clearances in its manual, open up ventilation in built-in installations and move it away from heat sources. Extract fans in hot back rooms help a great deal.

  3. 3. Condenser fan not working

    Technician job

    Signs: No airflow at the condenser, fan blade stuck or slow, compressor trips within minutes of starting.

    Fix: Isolate power and call a technician to replace the fan motor or capacitor. Do not run the unit without condenser airflow.

  4. 4. Low supply voltage

    Technician job

    Signs: Lights dim at start, overheating worse in evening peak hours, stabiliser display shows low readings.

    Fix: Use a correctly sized stabiliser or voltage protector and avoid extension boards. Ask an electrician to check the supply and wiring.

  5. 5. Low refrigerant charge

    Technician job

    Signs: Compressor runs long and hot while the cabinet cools poorly; partial frost on the evaporator.

    Fix: A technician must locate and fix the leak, then recharge by weight. Low charge reduces the cool gas returning to the compressor, so it overheats even in a cool room.

  6. 6. Failing compressor or starting components

    Technician job

    Signs: Overheats even with a clean condenser and good voltage, noisy running, high current draw measured by the technician.

    Fix: A technician tests the start components and the compressor. Replacing a compressor is a sealed-system job.

When to call a technician

If the compressor still trips on overload after you have cleaned the condenser and given it room to breathe, or if the condenser fan is not running, call a technician. Do the same if you notice a burning smell, scorched wiring, or the MCB tripping. A compressor that has overheated repeatedly may need its oil and starting parts checked even after the root cause is fixed.

Switch off and isolate power before any cleaning near the compressor. Let the compressor cool before cleaning around it, because the discharge pipe and shell can burn skin. Only trained technicians should work on the sealed system, and hydrocarbon units (R290 or R600a) need ignition-safe procedures.

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