Aircon Leaking Water? 5 Common Causes and How to Fix It Fast (2026)

Have you noticed water dripping from your air conditioner? Don't ignore it.

A leaking aircon is one of the most common problems faced by homeowners in Malaysia. While a few drops of water may seem harmless, continuous leaking can damage your walls, ceiling, flooring, and even your furniture. In some cases, it may also indicate a more serious issue inside your air conditioning system.

The good news is that many aircon leaks can be fixed quickly if the problem is identified early.

In this guide, we'll explain the five most common causes of an aircon leaking water, how to fix them, and when it's time to call a professional technician.

Why Is My Aircon Leaking Water?

During normal operation, your air conditioner removes moisture from the air. This moisture collects as condensation and flows through the drain pipe before being safely discharged outside.

If something interrupts this drainage process, water begins to collect inside the indoor unit and eventually leaks into your home.

Let's look at the most common reasons this happens.

1. Clogged Drain Pipe

A blocked drain pipe is the number one cause of water leaking from an air conditioner.

Over time, dust, dirt, mold, algae, and debris accumulate inside the drainage pipe. When the pipe becomes blocked, condensed water cannot flow out properly, causing it to overflow from the indoor unit.

Signs of a clogged drain pipe

• Water dripping from the front of the air conditioner

• Water stains on the wall

• Musty smell from the unit

• Slow drainage

How to fix it

A technician will clean the drain pipe using specialized equipment to remove the blockage and restore proper water flow.

Regular servicing helps prevent drain pipes from becoming clogged.

2. Dirty Air Filters

Air filters play an important role in maintaining airflow through your air conditioner.

When the filters become covered with dust, airflow is reduced. This can cause the evaporator coil to become too cold and freeze.

When the ice eventually melts, it creates more water than the drainage system can handle, leading to leaks.

Signs of dirty filters

• Weak airflow

• Poor cooling performance

• Ice forming inside the unit

• Higher electricity bills

How to fix it

Wash or replace the air filters according to the manufacturer's recommendations.

Most households should clean their filters every two to four weeks, especially in Malaysia's dusty and humid environment.

3. Frozen Evaporator Coil

A frozen evaporator coil is another common reason an air conditioner starts leaking water.

The coil may freeze because of:

• Dirty air filters

• Low refrigerant levels

• Poor airflow

• Faulty fan motor

Once the ice melts, excess water overwhelms the drain tray and leaks from the indoor unit.

Signs of a frozen coil

• Ice visible inside the unit

• Weak cooling

• Water dripping after the aircon has been running

• Unusual noises

How to fix it

Turn off the air conditioner and allow the ice to melt naturally.

If the problem continues, have a qualified technician inspect the refrigerant level and cooling system.

4. Damaged or Rusted Drain Tray

The drain tray collects condensation before directing it into the drain pipe.

Older air conditioners may develop cracks or rust in the tray, allowing water to escape before reaching the drain outlet.

Signs of a damaged drain tray

• Water leaking even when the drain pipe is clear

• Visible rust

• Cracks in the tray

• Water collecting underneath the unit

How to fix it

A damaged drain tray usually needs to be repaired or replaced.

Ignoring this issue can lead to recurring water damage inside your home.

5. Improper Aircon Installation

An incorrectly installed indoor unit can also cause water leaks.

If the unit is not mounted at the correct angle, condensation cannot flow naturally toward the drain pipe.

Instead, water pools inside the unit and eventually drips from the front or bottom.

Signs of poor installation

• Water leaking shortly after installation

• Leaks despite regular servicing

• Uneven indoor unit

• Continuous dripping during operation

How to fix it

A professional technician can reinstall or adjust the mounting angle to ensure proper drainage.

Correct installation is essential for long term performance.

Can You Continue Using a Leaking Aircon?

It is not recommended.

Although the air conditioner may continue cooling, ongoing water leakage can cause:

• Ceiling damage

• Mold growth

• Electrical hazards

• Damaged flooring

• Expensive repairs later

If you notice continuous leaking, switch off the unit and arrange for an inspection as soon as possible.

How to Prevent Aircon Water Leaks

Preventive maintenance is the best way to avoid unexpected leaks.

Follow these simple tips:

• Clean air filters every two to four weeks.

• Schedule professional servicing every six months.

• Keep the drain pipe clean.

• Arrange a chemical wash when heavy dirt builds up.

• Repair small issues before they become major problems.

• Ensure the air conditioner is installed correctly.

Routine maintenance keeps your system running efficiently and reduces the risk of costly repairs.

When Should You Call an Aircon Technician?

Some minor maintenance tasks can be done at home, but professional help is recommended if:

• Water continues leaking after cleaning the filters.

• Ice repeatedly forms inside the unit.

• The air conditioner is not cooling properly.

• You notice refrigerant issues.

• The drain tray is damaged.

• The leak becomes worse over time.

A trained technician can accurately diagnose the problem and prevent further damage.

Frequently Asked Questions

Is it normal for an air conditioner to produce water?

Yes. Air conditioners naturally remove moisture from the air. The water should drain safely through the drainage pipe. It should never drip inside your home.

Can a dirty filter cause water leakage?

Yes. Dirty filters reduce airflow, causing the evaporator coil to freeze. When the ice melts, excess water can overflow and leak from the unit.

How much does it cost to fix a leaking aircon in Malaysia?

The repair cost depends on the cause. Cleaning a blocked drain pipe is usually affordable, while replacing damaged parts or repairing refrigerant leaks may cost more. A technician can provide an accurate quotation after inspection.

How often should I service my air conditioner?

For most Malaysian homes, professional servicing every six months is recommended. Homes that use air conditioning daily may benefit from more frequent maintenance.

Final Thoughts

A leaking air conditioner is more than just an inconvenience. It is often a warning sign that your system needs attention. Whether the problem is a clogged drain pipe, dirty air filters, a frozen evaporator coil, a damaged drain tray, or poor installation, addressing the issue early can prevent costly repairs and extend the life of your air conditioner.

Regular maintenance and timely servicing are the best ways to keep your aircon running efficiently throughout Malaysia's hot and humid climate. If your unit continues leaking despite basic cleaning, it's time to have it inspected by a qualified air conditioning technician.