You’ve just had your aircon serviced, expecting cool, refreshing air, but it still feels warm or uneven. Frustrating, right? Many homeowners in Singapore face this issue, even after a professional cleaning. The truth is, regular servicing doesn’t always fix every underlying problem.
Let’s explore the most common reasons your aircon isn’t cooling properly even after servicing, and what you can do about it.
1. Incorrect Gas or Refrigerant Levels
One of the most common culprits is low or incorrect refrigerant pressure. Even if your technician cleaned the unit, the system won’t cool efficiently if the gas charge isn’t balanced.
- Too little gas: the cooling coil can’t absorb enough heat.
- Too much gas: the system loses pressure efficiency.
What to do: Ask for a pressure check during servicing to ensure your refrigerant levels are accurate.
2. Clogged or Damaged Condenser Coil
While indoor units are often cleaned during servicing, the outdoor condenser can be overlooked. A dirty or damaged coil prevents heat from escaping, reducing the system’s cooling efficiency.
What to do: Request full system cleaning that includes both indoor and outdoor units, especially for older systems or outdoor condensers exposed to debris.
For more on recognising the early signs of aircon issues, see How do I know if my AC needs servicing in Singapore?
3. Faulty Thermostat or Temperature Sensor
If your aircon cycles on and off too often or fails to reach the set temperature, the thermostat could be reading the room incorrectly.
What to do: Calibrate or replace the thermostat if it’s inaccurate. In newer systems, a technician can easily test and adjust the temperature sensor.
4. Weak Airflow or Fan Motor Issues
Sometimes the air feels cool near the vent but doesn’t circulate well throughout the room. This could mean your fan motor is running slow or your blower is clogged with dust.
What to do: Have the fan motor checked and lubricated. Strong airflow is just as important as cooling power.
5. Hidden Refrigerant Leaks
Even if refrigerant was topped up, a tiny leak in the piping can slowly release gas over days or weeks, causing the system to lose cooling capacity again.
What to do: Ask your technician to perform a leak test using a pressure gauge or electronic detector. It’s a quick way to find and seal leaks before refilling gas again.
6. Poor Installation or Aging System
If your aircon is fairly new but never cooled properly since day one, improper installation may be the real reason, such as incorrect piping or insulation. On the other hand, older units (8–10 years or more) can simply lose efficiency over time.
What to do: A qualified aircon repair service in Singapore can inspect the setup, insulation, and overall condition to see if replacement might be more cost-effective.
This is one reason why regular aircon servicing is so important – it helps detect these deeper issues early, before they escalate.
7. Electrical or Control Board Problems
A faulty circuit board can interrupt communication between components, causing the compressor or fan to shut off prematurely. These issues often go unnoticed during a basic cleaning.
What to do: If your aircon switches off randomly or doesn’t respond to settings, get an electrical check by a licensed technician.
8. Incomplete Servicing or Missed Components
Not all servicing packages are equal. Some companies only perform basic cleaning without checking refrigerant, drainage, or electrical systems. This can leave bigger issues unresolved.
What to do: Always confirm what’s included in your service package and ensure it covers inspection, cleaning, and testing for full performance.
Conclusion: Proper Diagnosis Matters More Than Basic Servicing
When your aircon still doesn’t cool after servicing, it usually means there’s an underlying issue that simple cleaning can’t fix. A detailed inspection and repair by an experienced team can quickly identify the root cause and prevent repeated breakdowns.
For reliable aircon installation and repair in Singapore, contact Techtimia Engineering Pte. Ltd. Our technicians handle everything from troubleshooting to full system restoration, ensuring your aircon works exactly as it should.
