Kolkata's summers are notoriously hot and humid. When your Split or Window AC stops cooling and starts blowing warm air, it can become an immediate household emergency. Before calling in a professional, it helps to understand why your air conditioner is failing.

Here are the 5 most common reasons your AC is not cooling and how to address them:

1. Extremely Clogged Air Filters

Air filters trap dust, pollen, and hair. Over time, these filters get completely blocked.

  • The Problem: Restricted airflow prevents warm air from passing over the cooling coils. This can cause the coils to freeze, creating a solid block of ice that completely shuts off cool air.
  • The Fix: Slide out your AC filters, rinse them under running tap water, let them dry completely, and slide them back in. Clean your filters once every 15 days during peak summer!

    • 2. Dirty Evaporator & Condenser Coils

    Your AC's indoor unit houses the evaporator coils, while the outdoor unit holds the condenser coils. Dust and grime act as an insulating blanket on these coils, preventing heat transfer.

  • The Problem: The outdoor unit cannot release the absorbed heat, forcing the compressor to run hotter and eventually shut down due to overheating.
  • The Fix: Schedule a high-pressure jet wet servicing. Our technicians use customized pressure washing kits to deep-clean coils without bending the delicate aluminum fins.

    • 3. Low Refrigerant Gas (Freon Leakage)

    Refrigerant gas is what actually transfers heat from the inside of your room to the outside environment. An AC does not "consume" gas; if the gas is low, there is a leak in the copper pipelines.

  • The Problem: Low gas levels cause the compressor to strain, ice to form on the copper lines, and the air coming out of the vents to feel lukewarm.
  • The Fix: Simply topping up gas on a leaking system is a waste of money. Our technicians perform nitrogen pressure tests, detect and braze the leak points, vacuum the system, and complete a full refrigerant charge (R32, R22, or R410) with a 90-day warranty.

    • 4. Faulty Capacitor or Relay Switch

    The compressor in your outdoor unit requires a massive burst of electrical energy to start running. This energy is stored and delivered by the run capacitor.

  • The Problem: Due to voltage fluctuations or extreme outdoor temperatures in Kolkata, capacitors frequently swell up and fail. When this happens, you will hear a humming sound from the outdoor unit, but the fan and compressor won't turn on.
  • The Fix: This involves working with high voltage. Our doorstep technicians carry standard 35mfd to 50mfd capacitors and replace them safely in under 15 minutes.

    • 5. Thermostat Setting Errors

    Sometimes, the simplest issues are overlooked.

  • The Problem: The AC remote may have accidentally been switched to "Fan Mode" or "Dry Mode" instead of "Cool Mode", or the set temperature is higher than the room temperature.
  • The Fix: Make sure the remote shows a snowflake icon (Cool Mode) and the temperature is set to a comfortable 24°C for optimum cooling and energy efficiency.

    • Need Professional AC Service in Kolkata?

    If you've cleaned your filters and checked your remote, but your AC is still not cooling, don't sweat it! Book a same-day doorstep AC inspection with Appliance Service Kolkata for only ₹299 (completely adjusted in your repair bill). Call us at +91 8240528725 today!