Fan Running, but Split AC not Cooling– Unraveling the Causes

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By janifer

In the scorching heat of summer, a malfunctioning air conditioner can quickly turn your living space into an unbearable sauna. One common issue that perplexes many homeowners is when the AC’s fan is running, but the split AC refuses to cool the room adequately. Let’s dive into the intricacies of this problem and explore the possible causes behind it.

Understanding the Basics

Before delving into the reasons why your split AC might not be cooling despite the fan running, it’s essential to grasp the basics of how these systems operate. A split AC comprises two main units – the indoor unit with the evaporator coil and the outdoor unit containing the condenser and compressor. The fan plays a crucial role in circulating air, contributing to the cooling process.

Common Reasons for a Fan Running but No Cooling

Low Refrigerant Levels

Explanation: Inadequate refrigerant levels hinder the cooling process.

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Solution: Professional inspection and refilling of refrigerant.

Dirty or Clogged Air Filters

Explanation: Restricted airflow due to dirty filters affects cooling efficiency.

Solution: Regularly clean or replace air filters as part of routine maintenance.

Issues with the Thermostat

Explanation: Incorrect thermostat settings can lead to improper cooling.

Solution: Calibrate the thermostat to the desired temperature.

Read more from: Why Split AC Not Cooling But Fan Is Running? Reason And Steps

Faulty Compressor

Explanation: A malfunctioning compressor can’t circulate refrigerant effectively.

Solution: Professional assessment and potential compressor replacement.

Refrigerant Leakage

Explanation: Leakage leads to reduced refrigerant levels, impacting cooling.

Solution: Identify and fix leaks, followed by refilling refrigerant.

Problems with the Condenser Coil

Explanation: A dirty or damaged condenser coil hampers heat exchange.

Solution: Regularly clean the coil and address any damage promptly.

Troubleshooting Tips

Addressing these issues might not require a technical background, as some troubleshooting steps can be performed by homeowners.

Checking Refrigerant Levels

Ensure refrigerant levels are adequate for optimal cooling.

Cleaning or Replacing Air Filters

Regularly clean or replace filters to maintain proper airflow.

Calibrating the Thermostat

Adjust thermostat settings to match your comfort requirements.

Assessing Compressor Functionality

Listen for unusual sounds; seek professional help if needed.

Identifying and Fixing Refrigerant Leaks

Look for signs of leakage, such as oily stains or hissing sounds.

Cleaning the Condenser Coil

Keep the condenser coil clean for efficient heat exchange.

When to Seek Professional Help

While DIY solutions are beneficial, certain signs indicate the need for professional intervention.

Signs DIY Solutions Might Not Suffice

Unresolved issues despite troubleshooting efforts.

Persistent warm air despite fan running.

Importance of Timely Professional Intervention

Timely repairs prevent further damage and ensure long-term efficiency.

Preventive Measures

Regular maintenance is key to preventing AC malfunctions.

Regular AC Maintenance

Schedule routine professional maintenance to keep your system in top condition.

Monitoring and Addressing Issues Promptly

Be vigilant for signs of trouble and address them promptly to avoid major breakdowns.


In the battle against the summer heat, a malfunctioning split AC can be a significant adversary. Understanding the reasons behind a running fan but insufficient cooling is crucial for maintaining a comfortable living space. By following the outlined troubleshooting tips and seeking professional help when necessary, you can ensure your split AC operates at peak performance.

Frequently Asked Questions

Why is my split AC fan running but not cooling the room?

This issue can be attributed to various factors, including low refrigerant levels, dirty filters, or a faulty compressor. Refer to the troubleshooting tips in the article for possible solutions.

Can I fix the refrigerant leakage issue myself?

It’s recommended to seek professional assistance for refrigerant leakage issues, as handling refrigerants requires expertise and proper equipment.

How often should I clean or replace my AC’s air filters?

Air filters should be cleaned or replaced every 1 to 3 months, depending on usage and the environment.

What are the signs that my AC’s compressor is faulty?

Unusual sounds, inadequate cooling, or frequent on-off cycles are indicators of a faulty compressor. Consult a professional for a thorough assessment.

Is regular professional maintenance necessary for split ACs?

Yes, regular maintenance by a professional is crucial to keep your split AC functioning efficiently and to address potential issues before they escalate.

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