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REFRIGERATION

Troubleshooting

Compressor running all the time

A commercial refrigerator is meant to cycle: run until the cabinet reaches setpoint, rest, then run again. Long run times are not automatically a fault. On a 43 °C afternoon, during back-to-back service with the door opening every few seconds, or right after a big delivery, the compressor may run for long stretches. The warning sign is a compressor that never stops even at night when the door stays shut, or one that runs flat out while the cabinet stays warm. That pattern means heat is getting in, or the system cannot reject it, and your electricity bill and compressor life are both paying for it.

First, check these

  1. Watch the unit during a quiet period such as late night with the door closed. If it still never cycles off after an hour or two, there is a problem.
  2. Compare a thermometer reading with the setpoint. If the cabinet is at setpoint but the compressor keeps running, suspect the controller or sensor; if it is warm, suspect a heat or capacity problem.
  3. Check the setpoint has not been lowered. A refrigerator set to 0 °C or a freezer to −25 °C may never satisfy in a hot room.
  4. Inspect the condenser for dust and grease and confirm the condenser fan is spinning.
  5. Check the door gasket and the door closing fully, especially on units in busy service lines.

Likely causes

  1. 1. Dirty condenser or poor ventilation

    You can check this

    Signs: Hot air around the unit, visible dust or grease on fins, unit boxed in under a counter without vents.

    Fix: Isolate power and clean the condenser. Restore clearances and keep heat sources away. This is the single most common cause in Indian kitchens.

  2. 2. Setpoint too low for the room conditions

    You can check this

    Signs: Setpoint lower than needed for the product, or recently changed by staff trying to 'make it colder'.

    Fix: Set refrigerators to the warmest temperature that keeps food at or below 5 °C, typically around +3 to +4 °C, and storage freezers around −18 to −20 °C unless your product needs colder.

  3. 3. Door seal leaks or frequent openings

    You can check this

    Signs: Frost near the gasket, condensation around the door frame, door held open during prep, gasket torn.

    Fix: Clean or replace the gasket, adjust working habits so the door is not left open, and consider a door closer or curtain on heavily used units.

  4. 4. Iced-up evaporator

    Technician job

    Signs: Coil covered in ice, weak airflow inside, cabinet warm despite constant running.

    Fix: Do a manual defrost as a stopgap. If it recurs, a technician should check the defrost heater, sensor, drain heater and controller.

  5. 5. Low refrigerant charge

    Technician job

    Signs: Gradual decline over weeks, partial frost pattern on the evaporator, compressor warm but cabinet slow to cool.

    Fix: Needs leak detection and repair, then evacuation and a weighed charge by a technician.

  6. 6. Controller, sensor or relay fault

    Technician job

    Signs: Cabinet reaches or goes below setpoint but the compressor never stops, or the display reads very differently from your thermometer.

    Fix: A technician should check the sensor, controller output and contactor or relay. A stuck relay can freeze a refrigerator solid.

When to call a technician

Book a service if the compressor still runs continuously after you have cleaned the condenser, corrected the setpoint and fixed any door leaks, or if the cabinet is warm while the compressor works flat out. Also call if it runs constantly while the cabinet is colder than setpoint, because that points to a control fault that can freeze stock. Constant running shortens compressor life, so do not leave it for weeks.

Isolate power before cleaning condensers or removing grilles. Sealed-system work, especially on hydrocarbon refrigerants such as R290 or R600a, is for trained technicians only because the gas is flammable.

Book a service visit