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REFRIGERATION

Troubleshooting

Freezer not freezing or food going soft

A working freezer should keep stored product at or below −18 °C. When ice cream turns soft, meat yields to a thumb or the display creeps towards −10 °C, the cause is usually heat getting in faster than the system can remove it. In India that heat comes from long lid openings during service, worn seals, packed condensers and kitchens that touch 43 °C in summer. Check the simple things first; they fix most cases. If the freezer has been well above −18 °C for a long period, judge the stock separately before deciding what to keep.

First, check these

  1. Measure product temperature with a probe thermometer pushed between two packs, not just the display, which often shows air temperature near the sensor.
  2. Check the setpoint and that nobody has switched the unit to a chiller mode on a convertible or dual-temperature model.
  3. Look at the frost on the walls or evaporator. More than about 5 mm of frost on a chest freezer wall, or a solid block on an upright's coil, is insulating the cold surface.
  4. Close the lid or door and check the seal: run a hand around the gasket for cold leaks, and look for ice ridges or gaps at the corners.
  5. Feel and look at the condenser area. Dust, grease or boxes against the vents will cut capacity sharply on a hot day.

Likely causes

  1. 1. Heavy frost build-up

    You can check this

    Signs: Thick frost on chest freezer walls or a white-blocked evaporator in an upright; temperature rising slowly over days or weeks.

    Fix: Empty the freezer into another cold unit, switch off and defrost fully with the lid open, mop up, dry and restart. Then find why frost built so fast: usually seal leaks or long openings.

  2. 2. Door or lid seal leaking

    You can check this

    Signs: Frost or ice concentrated near one corner or along the gasket line, gasket torn, flattened or not springing back, lid does not sit flat.

    Fix: Clean the gasket with warm soapy water and check it seals evenly. Replace a torn or hardened push-in gasket with the correct part. A warped lid or hinge needs a technician.

  3. 3. Dirty condenser or no breathing space

    You can check this

    Signs: Compressor running nearly all the time, very hot air or hot side walls, unit squeezed against a wall or behind a counter.

    Fix: Isolate power and clean the condenser. Chest freezers often use the outer walls as the condenser, so leave the gaps the manual asks for on every side, not just the back.

  4. 4. Overloading with warm or unfrozen product

    You can check this

    Signs: Problem started after a large delivery or after loading fresh meat or batches of kulfi to freeze.

    Fix: A storage freezer holds frozen food; it is not a blast freezer. Load warm product in small batches, spread out, and give it time. For regular large batches, use equipment designed to freeze down.

  5. 5. Evaporator fan or defrost fault (upright freezers)

    Technician job

    Signs: Upright freezer with fan-forced air: no airflow from the fan, or the coil stays iced even after a manual defrost.

    Fix: A technician needs to test the fan motor, defrost heater, termination sensor and controller settings.

  6. 6. Refrigerant loss or weak compressor

    Technician job

    Signs: Gradual loss of temperature with a clean condenser and good seals, frost only on part of the cold surface, compressor runs non-stop.

    Fix: Call a technician for leak detection and a sealed-system repair. Do not accept a gas top-up without the leak being found and fixed.

When to call a technician

If the freezer cannot reach −18 °C within a day after a full defrost, a clean condenser and a sound seal, or if the compressor clicks, overheats or runs without any temperature drop, book a technician. Keep a short log of product and display temperatures over a day; it helps tell a capacity problem from a control fault. Move high-value stock early rather than waiting for the visit.

Never chip ice with a knife, screwdriver or ice pick. On many chest freezers the cooling tubes sit directly behind the inner wall, and a puncture releases refrigerant, which in hydrocarbon units (R290 or R600a) is flammable. Isolate power before defrosting or cleaning, and leave sealed-system work to a trained technician.

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