Why Your Aircon Stops Cooling Suddenly

Aircon Repair

There’s nothing more frustrating than switching on your air conditioner on a hot Singapore afternoon—only to realise it’s blowing warm air instead of cooling your room. When your aircon suddenly stops cooling, it disrupts your comfort and can even affect your productivity. But what exactly causes this issue? Understanding the reasons behind it can help you know when to troubleshoot and when to call the professionals.

At Aircool Aircon, a trusted aircon servicing company in Singapore, we’ve helped countless homeowners and businesses fix aircon cooling problems quickly and efficiently. In this article, we’ll explain the most common causes of poor cooling performance, how to prevent them, and what you can do to keep your aircon running efficiently all year round.

Our Common Aircon Problems

Aircon not cold

Daikin Aircon Not cold

Mitsubishi Aircon not cold

Midea Aircon Not cold

Aircon error code

Daikin Aircon error Code

Mitsubishi Aircon Error code

Midea aircon Error code

Aircon light Blinking

Mitsubishi Aircon light blinking

Daikin Aircon Light Blinking

Midea Aircon Light Blinking

Daikin Aircon water leaking

Mitsubishi Aircon water leaking

Midea aircon water leaking

1. Dirty or Clogged Air Filters

One of the most common reasons your aircon stops cooling suddenly is a dirty or clogged air filter. Over time, dust and debris accumulate in the filter, restricting airflow and preventing cool air from circulating properly. When airflow is blocked, the aircon has to work harder, which can cause overheating and even ice buildup on the coils.

Solution:

Clean or replace your air filters every 2–4 weeks, depending on how often you use your aircon. Regular aircon servicing by professionals like Aircool Aircon ensures that filters are properly cleaned or replaced, helping maintain strong and efficient cooling performance.

2. Low Refrigerant Levels

The refrigerant (also known as coolant or gas) is the lifeblood of your air conditioning system—it’s what absorbs heat from the air and releases cool air into your room. If your aircon is running but not cooling, it may be due to low refrigerant levels caused by a leak.

Signs of a refrigerant issue include:

• Weak or no cool air

• Hissing or bubbling sounds from the indoor or outdoor unit

• Ice forming on the evaporator coils

Solution:

Do not attempt to refill refrigerant gas on your own—it requires professional equipment and handling. Contact Aircool Aircon in Singapore to inspect and fix any refrigerant leaks safely. Our technicians can accurately detect the leak, repair it, and refill the system with the correct amount of refrigerant to restore efficient cooling.

Aircon gas topup

3. Faulty Compressor

The compressor is the heart of your air conditioning system. It’s responsible for circulating refrigerant between the indoor and outdoor units. If the compressor fails, your aircon will stop cooling altogether, even if the fan and other parts seem to be working.

A faulty compressor may result from electrical problems, wear and tear, or insufficient maintenance.

Solution:

Compressor issues should always be handled by professionals. At Aircool Aircon, our expert technicians can assess whether the compressor can be repaired or needs replacement. With proper diagnosis and quality parts, we’ll ensure your system is restored to full efficiency.

Aircon Servicing Contract

4. Dirty Condenser Coils

The condenser coils in the outdoor unit play a key role in releasing the heat absorbed from your indoor air. However, being outdoors means they are exposed to dirt, dust, and debris. When these coils get dirty, heat cannot dissipate properly, forcing your aircon to overwork and reduce its cooling power.

Solution:

Schedule regular aircon servicing with Aircool Aircon to ensure your condenser coils are thoroughly cleaned. This helps your unit perform efficiently, prolongs its lifespan, and saves energy in the long run.

HDB/BTO Aircon Service

Condo Aircon Service

Commercial Aircon Service

5. Thermostat Issues

Sometimes, your aircon itself may not be the problem—the thermostat could be the culprit. If the thermostat is faulty or not calibrated correctly, it may send incorrect signals to the system, causing it to turn off before reaching the desired temperature.

Solution:

Check if your thermostat is set to the correct cooling mode and temperature. If the issue persists, have it inspected by a professional from Aircool Aircon to determine whether it needs recalibration or replacement.

1. Aircon Promotion

2. aircon trunking

6. Blocked Airflow or Obstructed Vents

If your aircon is running but your room still feels warm, check your air vents. Sometimes, furniture, curtains, or decorations may block airflow. In other cases, internal duct blockages might restrict air circulation.

Solution:

Ensure that nothing is blocking the air vents. If airflow still seems weak, contact Aircool Aircon to inspect your air ducts and vents for internal obstructions or damages. Proper airflow ensures even cooling throughout your space.

1. Daikin Aircon vs Mitsubishi Aircon

2. Most Long-Lasting Aircon Brand

3. Aircon Piping Installation

7. Electrical or Circuit Board Problems

Air conditioners rely on a range of electrical components to function properly. A malfunctioning circuit board, blown fuse, or faulty wiring can disrupt power to key parts of the aircon, leading to sudden cooling failure.

Solution:

Never attempt to fix electrical components yourself—it’s unsafe and could cause more damage. Aircool Aircon offers safe and reliable electrical diagnostics and repairs to get your system running again quickly.

Preventing Sudden Cooling Failures

The best way to avoid sudden aircon cooling problems is through regular maintenance and servicing. In Singapore’s humid climate, air conditioners work extra hard, so scheduling professional servicing every 3–4 months can make a huge difference.

Aircon chemical wash

Aircon Chemical overhaul

Aircon gas topup

Commercial Maintenance Plans

Aircon Servicing Contract

Aircon Installation

At Aircool Aircon, we offer comprehensive aircon servicing packages that include filter cleaning, coil washing, refrigerant checks, and system inspections. Regular servicing not only prevents costly breakdowns but also improves cooling performance and energy efficiency.

Conclusion

When your aircon stops cooling suddenly, it’s often a sign of deeper issues like clogged filters, low refrigerant, or mechanical faults. While basic cleaning can help, many problems require professional attention to ensure your unit is safe and efficient.

For reliable aircon servicing and repair in Singapore, Aircool Aircon is your trusted partner. Our experienced technicians provide fast, affordable, and high-quality solutions to restore your cooling comfort in no time.

Contact Information

Call: +65 90050975 (or) WhatsApp us: https://wa.me/6590050975

11 Mandai Estate, #03-09 Eldix

Singapore 729908

Mail ID: Airconaircool@gmail.com

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