If your aircon is making strange noises, struggling to cool your room, or shutting down unexpectedly, your compressor may be overheating. This is one of the most common issues in Singapore homes, and if ignored, it can cause permanent damage, reduce efficiency, and increase electricity bills. Fortunately, most causes can be prevented with simple steps, and in this article, we explain why compressors overheat and how to fix the problem safely.
1. Dirty Air Filters and Coils
Dirty filters or clogged evaporator coils can block airflow. As a result, the compressor has to work harder, which generates extra heat.
Watch for these signs:
Weak airflow
Poor cooling performance
Strange humming or buzzing sounds
To fix this, clean your aircon filters every 2–4 weeks. Also, schedule professional servicing to clean the coils and other internal parts. By doing so, airflow stays smooth, and the compressor experiences less strain — helping your aircon run efficiently and last longer.
2. Low Refrigerant Levels
Another common cause of overheating is low refrigerant (gas). When there isn’t enough, the aircon struggles to transfer heat efficiently. Consequently, the compressor can overheat and may even fail.
Watch for these signs:
Room takes longer to cool
Frost forming on the evaporator coil
Hissing or bubbling noises
To fix this, call a licensed technician to check and refill the refrigerant safely. Importantly, never try DIY topping — it is both unsafe and illegal in Singapore.
3. Electrical Issues
Sometimes, aircon overheating is caused by electrical problems. For example, faulty wiring, voltage fluctuations, or malfunctioning capacitors can make the compressor draw too much current. As a result, the unit may overheat and trip safety switches.
To prevent this, have a professional inspect the electrical components during regular servicing. This way, you reduce the risk of dangerous overheating and potential fire hazards.
4. Overworking Your Aircon
Running your aircon at very low temperatures for long periods can stress the compressor. In fact, Singapore’s tropical heat often makes units work overtime, which increases the risk of overheating. To prevent this, you can take simple steps to protect your system.
First, set your aircon to 24–26°C. Next, use the ‘Auto’ fan mode to balance cooling and efficiency. Additionally, during extreme heat, give the unit short breaks if possible.
By following these tips, you reduce strain on the compressor and help it last longer. As a result, your aircon stays efficient, safe, and cools your home effectively.
5. Poor Installation or Blocked Outdoor Unit
Finally, the installation and placement of your aircon’s outdoor unit matters a lot. For instance, units exposed to direct sunlight or placed in enclosed spaces tend to overheat faster. In addition, leaves, debris, or poor ventilation can block airflow and make the problem worse.
To prevent this, make sure your outdoor unit has enough space and good ventilation. Also, keep the area clean and shaded whenever possible. By taking these steps, you can greatly reduce the risk of overheating.
Tips to Prevent Compressor Damage
Here’s a quick summary for Singapore homeowners:
✔ Schedule professional aircon servicing at least once a year
✔ Clean filters and check for dust regularly
✔ Monitor refrigerant levels and refill safely when needed
✔ Avoid running the unit at extremely low temperatures for long periods
✔ Ensure outdoor units are properly installed and ventilated
By following these tips, your compressor will last longer and work more efficiently.
📞 Book Your Aircon Service Today
At Lion City Air Conditioner Services, we help prevent and fix aircon compressor issues safely. Our team offers professional aircon servicing, installation, and repair in Singapore, keeping your units cool, efficient, and long-lasting.
📞 Call: +65 8818 5781
🌐 Book online: lioncityaircon.sg
With regular professional maintenance, your aircon compressor stays healthy — and your home stays comfortably cool all year round.
