LS Aircon Servicing Singapore

Central Aircon Problems

8 Common Central Aircon Problems and How to Fix Them

Homeowners need to be aware of central aircon problems to resolve them promptly. Central aircon systems are a staple in many homes, providing efficient cooling during hot summers. However, like any complex system, they can encounter problems that affect their performance. In this guide, we’ll explore eight common central air conditioning problems and provide simple solutions to fix them.

How to Fix Central Aircon Problems?

Central air conditioning is crucial in maintaining indoor comfort, especially in warm climates. However, central system aircon issues can arise over time due to wear and tear, lack of maintenance, or other factors. Before you repair central aircon issues, understanding these common problems and knowing how to address them can help a lot. This section will explain eight common central aircon problems and their solutions. 

1. Insufficient Cooling

Problem: Your central aircon doesn’t cool your home as effectively as it used to, leading to discomfort.

Solution: Check and clean the air filters regularly to ensure proper airflow. Additionally, inspect and clean the outdoor condenser unit to remove debris hindering cooling efficiency. If the problem persists, consider hiring a professional to check for refrigerant leaks or compressor issues.

2. Uneven Cooling

Problem: Some rooms in your home feel cooler than others, creating temperature imbalances.

Solution: Check and adjust the vents in each room to ensure proper airflow distribution. Also, consider installing a zoning system to control temperatures independently in different areas of your home. Insulate ductwork to prevent air leaks and maintain consistent cooling throughout the house.

common Central Aircon Problems

3. Noisy Operation

Problem: Your central aircon makes loud noises during operation, such as banging, rattling, or whistling.

Solution: Inspect the air handler for loose or damaged parts and tighten or replace them. Clean the blower fan and motor to reduce noise caused by debris buildup. If the noise persists, consult a technician to diagnose and resolve the issue.

4. High Energy Bills

Problem:  If your energy bills have increased significantly, it indicates inefficiency in your central aircon system.

Solution: Regularly check and replace air filters to improve airflow and reduce energy consumption. Schedule annual maintenance with a professional to clean coils, check refrigerant levels, and ensure all components work efficiently. If your current system is old or outdated, you may need to upgrade to a newer, more energy-efficient system.

5. Thermostat Issues

Problem: Your central aircon doesn’t respond accurately to thermostat settings. This results in temperature inconsistencies.

Solution: If the thermostat is not functioning correctly, calibrate or replace it. To prevent false readings, ensure the thermostat is located away from heat sources and exposed to direct sunlight. Consider upgrading to a programmable thermostat for better temperature control and energy savings.

6. Frozen Evaporator Coils

Problem: The evaporator coils in your central aircon freeze up, restricting airflow and reducing cooling capacity.

Solution: Check and replace dirty air filters to prevent debris buildup on the coils. Ensure proper airflow by keeping vents unobstructed and cleaning ductwork regularly. If the coils continue to freeze, consult a professional to check for refrigerant leaks or airflow problems.

7. Leaking Refrigerant

Problem: Your central aircon is losing refrigerant, causing decreased cooling performance and potential environmental hazards.

Solution: Schedule a professional inspection to detect and repair refrigerant leaks. Ensure all connections and components are properly sealed to prevent future leaks. Avoid adding refrigerant yourself, and always hire a licensed technician like LS Aircon Servicing Singapore, which offers aircon installation, aircon general service, and aircon repair services.

fix Central Aircon Problems

8. Electrical Problems

Problem: Your central aircon experiences electrical issues, such as frequent tripping of circuit breakers or malfunctioning components. Electrical problems are the most frequently occurring central aircon problems and must be addressed promptly.

Solution: Check and replace faulty wiring, switches, or capacitors. Ensure electrical connections are secure and free from corrosion. If you need to become more experienced with electrical work, hire a qualified electrician or HVAC technician to diagnose and fix electrical problems safely.


In conclusion, central aircon problems are easier to resolve if you have the proper knowledge and tools. Maintaining a well-functioning central air conditioning system requires regular maintenance and prompt attention to common problems. By addressing these eight common issues and implementing the suggested solutions, you can ensure your central aircon operates efficiently, provides consistent cooling comfort, and lasts for years to come. If you encounter complex or persistent problems, feel free to seek professional help from experienced HVAC technicians.

Frequently Asked Questions

Some of the most common reasons a central air system stops working are low coolant levels, blocked or dirty air filters, frozen coils, or electrical issues. The above sections explain the common problems in detail.
One significant disadvantage of central air conditioning is the high upfront cost associated with professional installation.
This typically suggests grime buildup within the compressor but could also indicate a more complex refrigerant leak.