Split AC Not Cooling: 9 Causes and Fixes

23 September, 2026 | by admin

A split AC that fails to cool could cause you a lot of discomfort when living in a very warm area. This is because it may make you look for AC repair services by calling technicians for “AC repair Dubai near me“. However, it would be important to have knowledge about some possible faults. The good news is that there are many simple faults that can be solved easily.

In this article, you will find out the causes of the breakdown of your split AC unit. There are many different reasons, but we have selected the 9 most common. Each of the reasons will be explained with instructions on how to identify them. Some issues can be solved within a couple of minutes, while others, such as gas leakage, require professional help.

Top Reasons Your Split AC is Not Cooling Properly and Its Fixes

Your AC is working but still not providing cool air? There could be multiple reasons for the issue, ranging from clogged filters to insufficient refrigerant levels. Here are 9 probable reasons why your AC is not providing cool air and their solutions.

Dirty air filters

Once the filters get clogged with dust particles, they will obstruct the flow of air in your air conditioning unit. The result of this is that the air that comes from your air conditioning unit may be warm instead of being cool as expected. For efficient running of your air conditioning unit and maintaining comfort within the premises, you need to change your filters on a monthly basis.

Blocked outdoor unit

Proper space should be provided for the outdoor unit in order for heat dissipation to occur effectively. It is imperative to note that the unit may fail to function effectively if there are dust particles or leaves that obstruct its operation. Therefore, any material that may cause obstruction should be removed from the surroundings of the unit. Many people in Dubai call for AC cleaning services in Dubai when their unit fails.

Faulty thermostat

Faulty thermostats will give you incorrect temperatures. This could mean that your air conditioner assumes that the room is cold while it is not. In order to try and solve this problem, check the batteries in your thermostat. Batteries that have become weak or are no longer working at all could be the cause of this problem. If this does not work, consider installing a new thermostat.

Bad compressor

The compressor is the core component of your air conditioning unit. Refrigerants are pumped around all the components using the compressor. If the compressor fails, it will affect the functionality of the air conditioning unit since it will not be able to cool down the air anymore, and hence you will be getting warm air coming from the vents. This is a sure sign that something is wrong with the unit.

Old or undersized AC

With time, air conditioners become less effective and efficient. As a result, you will experience discomfort in your living areas. In cases where your air conditioner is not big enough for the room, it will have problems maintaining an optimal temperature, particularly when it is very hot. If your air conditioner is more than ten years old, you should buy a new one because it will save energy.

Low refrigerant gas

Your air conditioner will not be able to cool the room in case of a gas leak. There will be a hissing noise indicating the loss of the coolant. It is imperative to have a qualified professional recharge the system and also address all other issues in the air conditioner. Do not attempt to repair it yourself, as it might lead to further complications.

Dirty condenser coils

If the air conditioning coils become dirty, they will absorb heat and thus become ineffective at cooling. It may cause poor cooling efficiency and increased electricity bills. In order to ensure proper functioning of your air conditioning system, you should have the coils cleaned by professionals. It will not only help improve cooling but also increase the life of your AC.

Clogged drain line

When the drain line gets clogged, there is a possibility that there could be some water leaks that would reduce the ability of the air conditioner to cool the environment. The first thing you should do to solve this problem is to flush out the drain line with water.

Frozen evaporator coil

In the event that your air conditioning machine lacks sufficient refrigerant or has dirty filters, the coil will freeze. The formation of ice will cause the blockage of airflow, and therefore, your machine will not cool your area. What you need to do is turn off the air conditioning machine and allow all the ice to melt before taking further steps.

Conclusion

The solution to most cooling problems is relatively simple. Make sure to clean your filters and coils frequently. Inspect your thermostat and outside compressor unit. Should these efforts not work, seek a professional technician.