How to Troubleshoot a Split AC Not Cooling but Fan Is Running

In the scorching summer heat, a malfunctioning split air conditioner can turn your home into an oven. If you find that your split AC's...
HomeTechnology NewsHow to Troubleshoot a Split AC Not Cooling but Fan Is Running

How to Troubleshoot a Split AC Not Cooling but Fan Is Running

In the scorching summer heat, a malfunctioning split air conditioner can turn your home into an oven. If you find that your split AC’s fan is running, but it’s not cooling as it should, you’re not alone. This common issue can be frustrating, but fear not, as we’ll guide you through the troubleshooting process step by step. In this article, we’ll explore the reasons behind this problem and provide you with valuable solutions and tips to get your split AC back to cooling your space efficiently.

How Does a Split AC Work?

To effectively troubleshoot the problem, it’s essential to understand the basic operation of a split AC system.

The Role of the Fan

The fan inside your split AC is responsible for circulating the air within the room. It doesn’t directly cool the air but assists in distributing the cold air produced by the evaporator coil.

The Cooling Mechanism

The cooling process primarily relies on the refrigeration cycle and the refrigerant, which absorbs heat from the indoor air and releases it outside.

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

Common Reasons for a Non-Cooling Split AC

Low Refrigerant Levels

One of the most common reasons for a split AC not cooling is insufficient refrigerant. We’ll delve into why this happens and how to address it effectively.

Dirty or Blocked Filters

Clogged air filters can significantly impact the AC’s performance. We’ll discuss the importance of clean filters and how to maintain them.

Faulty Thermostat

The thermostat is responsible for maintaining the desired temperature. A malfunctioning thermostat can result in improper cooling. We’ll explore thermostat issues and their solutions.

Refrigerant Leaks

Refrigerant leaks not only reduce cooling but are also harmful to the environment. We’ll examine the signs of a refrigerant leak and what to do about it.

Electrical Problems

Issues with the electrical components of your AC, such as capacitors or relays, can hinder its cooling capacity. We’ll discuss troubleshooting these problems.

Blocked Condenser Unit

An obstructed condenser unit can impede the heat dissipation process. We’ll provide tips on keeping the condenser unit clean.

Solutions and Tips

Regular Maintenance

Regular maintenance is the key to keeping your split AC in top condition. We’ll outline a maintenance schedule and the steps involved.

Cleaning or Replacing Filters

Maintaining clean filters is crucial. We’ll guide you on how to clean or replace them, depending on the type of filter your AC uses.

Refrigerant Recharge

If your AC is low on refrigerant, we’ll explain how to identify it and the steps for safely recharging the refrigerant.

Thermostat Calibration

Proper thermostat calibration is vital for maintaining the desired temperature. We’ll provide a step-by-step guide on how to calibrate it.

Professional Help

For complex issues, it’s always advisable to seek professional assistance. We’ll discuss when it’s time to call in an HVAC technician.


In conclusion, when your split AC’s fan is running, but it’s not cooling, several factors could be at play. By understanding the basics of how your AC operates and identifying common issues, you can take the necessary steps to troubleshoot and resolve the problem. Regular maintenance and addressing issues promptly can ensure your split AC provides you with the cooling comfort you need, especially during the scorching summer months.

Frequently Asked Questions

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

Regularly cleaning or replacing filters is recommended every 1-3 months, depending on the type and usage of your AC.

Can I recharge the refrigerant in my split AC on my own?

Refrigerant recharge should be performed by a qualified HVAC technician to ensure safety and effectiveness.

What is the ideal thermostat temperature setting for energy efficiency?

Setting your thermostat to 78°F (25-26°C) is generally considered energy-efficient for cooling.


Why is it important to keep the condenser unit clean?

A clean condenser unit allows for effective heat dissipation, enhancing your AC’s cooling efficiency and prolonging its lifespan.


How can I find a reliable HVAC technician for AC repairs?

You can find a reputable HVAC technician through referrals, online reviews, or by contacting local HVAC service providers.