Split Ac Water Leakage

Why Does Water Leak from the Copper Tube of a Split AC


Split air conditioning systems are popular for their ability to provide efficient cooling in residential and commercial spaces. However, it’s not uncommon for users to encounter water leakage from the copper tubes of their split AC units. In this article, we will explore the reasons behind this issue and provide insights into how it can be resolved.

Understanding the Split AC System

Before diving into the causes of water leakage, let’s briefly understand how a split AC system works. A split AC consists of two main components: an indoor unit and an outdoor unit. The indoor unit typically mounted on a wall or ceiling, contains the evaporator coil responsible for cooling the air. The outdoor unit houses the compressor and condenser coil.

Condensation and Water Accumulation

During the cooling process, the evaporator coil of the indoor unit extracts heat from the air, causing the moisture present in the air to condense on the coil’s surface. This condensation typically drips into a drainage tray or pan below the coil and is then channelled out through a drain pipe. The drainage system is designed to handle the water efficiently and prevent any leakage.

Common Causes of Water Leakage

1. Clogged or Disconnected Drainage Pipe

One of the primary reasons for water leakage is a clogged or disconnected drainage pipe. Over time, dust, dirt, and debris can accumulate in the pipe, obstructing the flow of water. This blockage can cause the water to overflow and leak from the copper tube.

2. Improper Installation

Incorrect installation of the split AC system can also lead to water leakage. If the drainage pipe is not installed at the appropriate angle or is poorly connected, it may fail to effectively channel the water out. As a result, the water can find its way out through the copper tube.

3. Frozen Evaporator Coil

If the evaporator coil becomes excessively cold, it can lead to ice formation on the coil. When the ice melts, it can overwhelm the drainage system, causing water to leak from the copper tube. Several factors can contribute to the freezing of the evaporator coil, such as dirty air filters, low refrigerant levels, or issues with the airflow.

4. Improper Sizing

In some cases, water leakage can occur due to an AC unit that is either oversized or undersized for the space it is cooling. An oversized unit tends to cool the air too quickly, resulting in inadequate dehumidification and excessive condensation. Conversely, an undersized unit may struggle to handle the moisture load, leading to water leakage.

5. Damaged or Corroded Components

Over time, certain components of the split AC system, including the copper tubes, may develop cracks, leaks, or corrosion. These issues can disrupt the proper functioning of the system and cause water to leak from the copper tube.

Resolving Water Leakage Issues

If you are experiencing water leakage from the copper tube of your split AC, here are some steps you can take to address the problem:

  1. Check the Drainage System: Inspect the drainage pipe for any clogs or disconnections. Clean the pipe thoroughly to remove any obstructions.
  2. Verify the Installation: Ensure that the drainage pipe is installed correctly, with the appropriate angle and secure connections. If necessary, seek professional assistance to rectify any installation issues.
  3. Inspect and Clean the Filters: Dirty air filters can impede airflow and lead to the freezing of the evaporator coil. Regularly clean or replace the filters as recommended by the manufacturer.
  4. Maintain Proper Refrigerant Levels: Low refrigerant levels can cause the evaporator coil to freeze. Schedule regular maintenance checks to ensure the refrigerant levels are adequate.
  5. Seek Professional Help: If you’ve tried the above steps and the water leakage persists, it’s advisable to contact a professional HVAC technician. They will have the expertise to diagnose and resolve complex issues with your split AC system.


Water leakage from the copper tube of a split AC can be a frustrating problem for users. By understanding the underlying causes and taking appropriate measures, you can prevent and resolve this issue effectively. Regular maintenance and professional assistance can go a long way in ensuring the optimal performance of your split AC system.