How to Fix an Aircon Not Cooling: Step-by-Step Guide for Malaysian Homes

A malfunctioning air conditioner can turn a comfortable Malaysian home into a hot and humid space. If your aircon is not cooling, it doesn’t always mean you need an expensive repair. Many issues can be diagnosed and fixed with simple troubleshooting steps.

This guide covers common causes, step-by-step fixes, preventive maintenance, and answers frequently asked questions to help your aircon run efficiently all year round.

Common Reasons Your Aircon is Not Cooling

Understanding the common causes of aircon problems helps homeowners troubleshoot efficiently and avoid unnecessary service costs.

Dirty or Clogged Air Filter

A dirty air filter restricts airflow, forcing your aircon to work harder and reducing cooling efficiency. Dust, pet hair, and pollutants build up over time, leading to uneven cooling.

Fix: Remove and wash the filter or vacuum it. Let it dry completely before reinstalling. Schedule regular aircon servicing every 3–4 months to prevent blockages.

Thermostat Settings and Malfunctions

Incorrect thermostat settings or a faulty thermostat can stop your aircon from cooling even when the unit is running.

Fix: Set the thermostat to ‘Cool’ mode, lower the temperature below the current room temperature, and replace or recalibrate the thermostat if necessary.

Low Refrigerant Levels

Low refrigerant prevents the aircon from absorbing heat properly.

Signs: Warm air from vents, ice forming on coils, or hissing/bubbling noises.

Fix: Contact a certified aircon repair technician to refill refrigerant safely and fix leaks.

Dirty Condenser Coils

Dust and debris on the condenser coils reduce heat transfer efficiency, especially in outdoor units exposed to Malaysia’s humid climate.

Fix: Lightly spray water for cleaning or book a chemical aircon service for deep cleaning.

Faulty Fan or Poor Airflow

A malfunctioning aircon fan reduces airflow and causes uneven cooling or warm spots.

Fix: Inspect and clean fan blades. If the fan motor is faulty, schedule a professional service.

Blocked or Leaking Ducts

For aircon systems with ductwork, leaks or blockages can drastically reduce cooling efficiency. Dust, debris, or loose connections in the ducts prevent cool air from reaching rooms effectively.

Fix: Inspect ductwork and seal any leaks. Professional duct cleaning may be required for extensive buildup.

Frozen Evaporator Coil

A frozen evaporator coil stops the AC from cooling. Ice can form due to poor airflow, low refrigerant, or dirty coils, preventing proper heat exchange.

Fix: Turn off the AC to allow ice to melt. Clean filters and check refrigerant levels. Call a professional if the problem persists.

Old or Inefficient Aircon Unit

Older units may no longer cool efficiently during peak Malaysian heat. They also consume more energy and may fail to maintain a consistent temperature.

Fix: Consider aircon installation for better efficiency, lower energy bills, and improved cooling performance.

Electrical or Component Failures

Faulty capacitors, blown fuses, or damaged wiring can prevent the aircon from running properly. Electrical issues may cause intermittent operation or total failure of the cooling function.

Fix: Call a professional aircon repair service to safely diagnose and repair electrical components.

Step-by-Step Troubleshooting Guide

1. Clean or replace the air filter.
    
2. Check thermostat settings and ensure it’s set to “Cool.”
    
3. Inspect the outdoor condenser unit and remove debris.
    
4. Reset the AC by turning off the main power for 5–10 minutes.
    
5. Contact a professional aircon repair technician if cooling doesn’t improve.

Preventive Aircon Maintenance Tips

• Schedule professional aircon servicing every 3–4 months.
   
• Clean air filters monthly and schedule coil cleaning periodically.
   
• Keep doors and windows closed while AC runs.
   
• Use curtains to block direct sunlight.
   
• Consider aircon maintenance packages for hassle-free upkeep.

When to Call a Professional Aircon Service

Call a professional if you notice:

• Faulty compressor or motor
   
• Major refrigerant leaks
   
• Electrical issues
   
• Persistent cooling problems
   

Hire a trusted HVAC service for safe and effective repairs.

FAQ – Common Aircon Issues

Q1: Why is my aircon not cooling but the fan is running?
A: Likely causes include dirty filters, low refrigerant, or a malfunctioning compressor. Check filters first and contact a professional if needed.

Q2: How often should I service my aircon?
A: Every 3–4 months for optimal performance in Malaysia’s humid climate.

Q3: Can I refill refrigerant myself?
A: No, refrigerant handling requires a licensed aircon repair technician for safety.

Q4: How can I prevent my aircon from not cooling?
A: Regular filter cleaning, coil maintenance, proper thermostat settings, and professional servicing prevent most issues.

Conclusion

A non-cooling aircon can often be resolved with troubleshooting, preventive maintenance, and professional help. Following these steps and scheduling aircon servicing ensures your system remains efficient all year.

Contact Sunmoon Aircond & Electrical Sdn Bhd today for expert aircon repair and servicing in Malaysia.