LS Aircon Servicing Singapore

Aircon Overheating

Top 7 Reasons Why Your Aircon Overheating and Effective Solutions

An aircon overheating disrupts indoor comfort and indicates potential system issues that require immediate attention. Understanding the underlying reasons behind air conditioner overheating and how to address these issues effectively can prevent costly repairs and ensure optimal performance. This comprehensive guide delves into the top seven reasons why your aircon may be overheating and provides actionable solutions to rectify these problems.

Fix Overheated Aircon

Air conditioner overheating is a common issue in the hot and humid conditions of Singapore. This issue if not dealt with in the initial phase can result in aircon overheating and shutting down. Therefore, homeowners must scroll through the possible reasons and solutions for AC overheating.

1. Dirty or Clogged Air Filters

Dirty or clogged air filters are a common cause of aircon overheating. When air filters become laden with dust, dirt, and debris, they obstruct airflow, forcing the system to work harder to cool the air. This increased workload can lead to overheating of the aircon’s components.

Solution: Regularly clean or replace air filters according to the manufacturer’s recommendations, typically every 1-3 months. This ensures unrestricted airflow and optimal cooling efficiency, preventing overheating issues.

2. Blocked or Restricted Air Vents

Blocked or restricted air vents impede the cool airflow into the room, causing the aircon to strain and overheat. Common causes of blocked vents include furniture placement, obstructions, or closed vents.

Solution: Ensure all air vents are clear of obstructions and open to allow unrestricted airflow. Rearrange furniture or remove obstacles obstructing the vents to promote efficient cooling and prevent overheating.

prevent Aircon Overheating

3. Insufficient Refrigerant Levels

Low refrigerant levels can cause the aircon coils to freeze, leading to overheating as the system tries to compensate for the lack of cooling capacity. Refrigerant leaks or improper charging are typical causes of insufficient refrigerant levels.

Solution: Conduct a professional inspection to check refrigerant levels and identify leaks or issues. Technicians can recharge refrigerant levels and repair leaks to restore optimal cooling performance and prevent overheating.

4. Dirty or Blocked Evaporator and Condenser Coils

Accumulation of dirt, dust, or debris on the evaporator and condenser coils restricts heat transfer and airflow, causing the aircon to overheat. Additionally, blocked condenser coils hinder the dissipation of heat from the system.

Solution: Regularly clean evaporator and condenser coils as part of routine maintenance. Use a soft brush or vacuum to remove dirt and debris from the coils, ensuring efficient heat transfer and preventing the aircon compressor from overheating.

5. Faulty or Failing Components

Malfunctioning components such as capacitors, fan motors, or thermostats can contribute to aircon overheating. These components regulate airflow, temperature control, and overall system operation.

Solution: If you suspect faulty components, consult a qualified HVAC technician for diagnosis and repair. Prompt replacement of malfunctioning parts restores the system’s functionality and prevents overheating issues.

6. Inadequate Airflow or Ventilation

Insufficient airflow or poor ventilation within the aircon system can lead to overheating. This may occur due to blocked ducts, damaged blower motors, or improper system design.

Solution: Keep ducts clean and unobstructed to ensure proper airflow and ventilation. Repair or replace damaged blower motors and address any design flaws that hinder airflow to prevent overheating.

Why Aircon Overheating

7. Overloaded or Inadequate Electrical Supply

An overloaded electrical supply or inadequate wiring can cause the aircon to overheat due to excessive electrical load or insufficient power supply. This is particularly common in older homes with outdated electrical systems.

Solution: Consult a licensed electrician to assess and upgrade your electrical supply. Avoid overloading circuits and ensure the aircon’s electrical requirements are compatible with your home’s electrical infrastructure to prevent overheating and electrical hazards.


An aircon overheating indicates underlying issues that require prompt attention and resolution. By addressing the top 7 reasons for aircon overheating outlined in this guide and implementing effective solutions, you can restore optimal performance, prevent costly repairs, and ensure consistent indoor comfort. Regular maintenance, timely inspections, and professional assistance when needed are key to maintaining a healthy and efficient aircon system.

Frequently Asked Questions

Q1: What happens when your AC overheats?

As your aircon heats up, it increases the probability of a breakdown or triggering your circuit breaker. Specifically, overheating can damage the components like compressors.

Q2: How do I stop my AC from overheating?

  • Increase the thermostat setting.
  • Ensure regular replacement of your air filter!
  • Schedule a maintenance appointment for your aircon.
  • Explore innovative cooling methods.
  • Minimize sources of indoor heat.

Q3: Why do air conditioners get hot?

These issues can arise from clogging, electrical faults, insufficient refrigerant levels, malfunctioning evaporator coils, or compressor issues.