Why Is My Aircon Leaking Water After Servicing?

Author : Letscool Aircon | Published On : 14 Sep 2026

Aircon Water Leaking

Air conditioning is essential for maintaining a comfortable indoor environment, especially in Singapore’s hot and humid climate. However, discovering water dripping from your aircon shortly after servicing can be frustrating. Many homeowners assume that servicing should eliminate every problem, so they may wonder why their aircon is still leaking water.

The truth is that water leakage after servicing can happen for several reasons. It may be caused by a blocked drainage pipe, an incorrectly positioned drain pan, improper installation, or an existing problem that was not fully resolved during maintenance. Understanding the possible causes can help you take the right action before the issue damages your walls, furniture, or electrical components.

In this article, LetsCool Aircon explains why your aircon may leak water after servicing, what you should do, and how regular maintenance can prevent repeated problems.

1. Why Does an Aircon Leak Water After Servicing?

An aircon produces condensation when warm indoor air passes over its cold evaporator coil. This moisture collects in a drain pan and flows through a drainage pipe to an appropriate outlet. Under normal conditions, the water should leave the system without entering your room.

After servicing, leakage may occur if the drainage system is not functioning correctly or if another underlying fault remains. Several factors can contribute to this issue:

A partially blocked or disconnected drainage pipe.
A drain pan that is not properly positioned.
Dirt or sludge remaining inside the drainage system.
An evaporator coil that becomes excessively cold and causes ice formation.
Incorrect aircon installation or poor drainage slope.
A damaged drain pan or loose internal component.
Improper reassembly after cleaning.

Although servicing is intended to improve performance, it does not automatically guarantee that every part of the aircon system is fault-free. A proper inspection is important when water leakage continues after maintenance.

2. Blocked Drainage Pipes: A Common Cause of Water Leakage

One of the most common reasons for aircon water leakage is a blocked drainage pipe. Dust, algae, mould, and accumulated sludge can build up inside the pipe over time. This is particularly common in Singapore, where warm and humid conditions encourage biological growth in damp drainage systems.

During aircon general servicing, technicians typically clean the filters, inspect the indoor unit, and check the drainage system. However, if the blockage is deep inside the pipe or the drainage line requires more extensive cleaning, a basic service may not completely resolve the problem.

When the drainpipe is blocked, condensation cannot flow away normally. Water may accumulate in the drain pan until it overflows from the indoor unit.

Signs of a blocked drainpipe

Water dripping from the bottom of the indoor unit.
Water leaking down the wall.
Gurgling sounds from the drainage pipe.
Water collecting around the aircon.
Leakage that becomes worse after the aircon runs for a long time.

If your aircon is leaking after servicing, ask the technician to inspect the complete drainage line rather than simply wiping away the visible water. Professional aircon repair Singapore services can help identify and clear persistent blockages.

View more: Professional Aircon Servicing in Singapore

3. Improper Cleaning or Reassembly During Servicing

Aircon servicing involves removing dust and dirt from various internal components. Depending on the type of maintenance, the technician may remove filters, covers, fan components, or other parts of the indoor unit.

If the drain pan is not fitted correctly after cleaning, water may not flow into the drainage outlet as intended. Similarly, a loose connection, displaced pipe, or incorrectly installed component can cause water to escape from the wrong location.

In some cases, water may also enter the unit during cleaning if protective covers are not used properly. If moisture reaches electrical components or remains trapped inside the unit, additional problems may develop.

A reliable servicing provider should inspect the indoor unit after cleaning and ensure that all components are securely reassembled. At LetsCool Aircon, customers should always request a clear explanation when leakage occurs after maintenance so the possible cause can be investigated instead of assuming that the issue is normal.

4. Low Refrigerant Levels and Frozen Evaporator Coils

Another possible cause of water leakage is a refrigerant-related cooling problem. When an aircon has insufficient refrigerant because of a leak or another system fault, the evaporator coil may become abnormally cold under certain operating conditions.

This can lead to ice formation on the coil. When the aircon is switched off, or when the ice melts, excess water may collect in the drain pan and overflow.

Low refrigerant is not always the direct cause of leakage, so a proper diagnosis is necessary. A blocked filter, restricted airflow, or malfunctioning blower fan can also contribute to coil freezing.

What should you check?

If your aircon is leaking water and is also not cooling properly, look for other warning signs:

Ice forming on the indoor coil or copper pipe.
Weak airflow from the indoor unit.
The room taking longer to cool.
Unusual hissing sounds.
Water dripping after the aircon has been switched off.

Do not assume that a gas top-up is the solution. Refrigerant does not normally disappear simply because an aircon is old. If the level is low, a technician should check for leaks, repair the underlying fault, and recharge the system according to the manufacturer’s specifications.

Professional aircon gas topup services should include appropriate checks rather than adding refrigerant without identifying the reason for the low level.

5. Poor Installation, Drainage Slope, or Damaged Components

Sometimes, the reason for leakage after servicing has nothing to do with the cleaning itself. The aircon may have an existing installation or component problem that becomes noticeable during normal operation.

The indoor unit must be positioned correctly, and the drainage pipe should have a suitable route and slope to allow condensation to flow away. If the pipe is bent, sagging, disconnected, or installed incorrectly, water may accumulate and leak from the unit.

Other possible causes include:

Cracks in the drain pan.
Loose drainage connections.
Damaged insulation around pipes.
Incorrectly positioned indoor unit.
A drainage pipe that is too narrow or poorly routed.
Water entering through an opening around the installation area.

If leakage repeatedly occurs after servicing, it may be necessary to inspect the installation rather than repeating the same cleaning procedure. Aircon installation Singapore professionals can assess drainage routes, pipe connections, and indoor unit positioning when an installation-related problem is suspected.

6. What Should You Do When Your Aircon Leaks After Servicing?

Taking immediate action can help prevent further damage. Follow these steps if you notice water dripping from your aircon.

Switch off the aircon

Turn off the aircon to reduce further condensation and prevent water from reaching electrical components. If water is close to electrical sockets, switches, or wiring, avoid touching wet electrical equipment and seek professional assistance.

Protect your furniture and flooring

Move furniture, electronics, and other valuable items away from the leaking area. Place a container or towel beneath the drip temporarily to collect water.

Check the aircon filter

A heavily clogged filter can restrict airflow and contribute to poor cooling or coil freezing. If the filter is accessible and safe to remove, follow the manufacturer’s cleaning instructions. However, filter cleaning alone may not resolve a drainage blockage.

Contact the servicing company

If the leakage began immediately after servicing, contact the company that performed the maintenance. Explain when the leakage started, where the water is coming from, and whether the aircon is still cooling normally.

A technician should inspect the drainpipe, drain pan, indoor coil, and relevant connections to identify the actual cause.

7. How Can Regular Aircon Servicing Prevent Water Leakage?

Regular maintenance can reduce the likelihood of drainage blockages and other aircon problems. However, the frequency and type of servicing should depend on usage, indoor conditions, and the system's condition.

For many homes, aircon general servicing every few months can help maintain filters, coils, airflow, and drainage performance. Homes with pets, heavy dust, or frequent aircon usage may need more frequent attention.

When basic maintenance is insufficient, an aircon chemical wash may be recommended to remove stubborn dirt and buildup from suitable components. A chemical overhaul is a more extensive service you may consider when the indoor unit has severe contamination or persistent performance problems.

Maintenance may also include:

Cleaning air filters and accessible components.
Checking the drain pan and drainage system.
Inspecting the evaporator coil.
Checking airflow and cooling performance.
Examining unusual noises or warning lights.
Identifying signs of refrigerant leakage.
Inspecting relevant electrical and mechanical parts.

Choosing the best aircon servicing Singapore provider means selecting a company that performs proper inspections instead of focusing only on surface cleaning. LetsCool Aircon can help homeowners understand the condition of their systems and determine whether general servicing, a chemical wash, or aircon repair is appropriate.

8. When Should You Call a Professional Aircon Repair Service?

Minor condensation is normal inside an aircon, but water dripping into your room is not something to ignore. Persistent leakage can damage paint, plaster, ceilings, flooring, and furniture. In severe cases, water may reach electrical components and create a safety risk.

You should arrange a professional inspection if:

Water continues leaking after servicing.
The aircon is not cooling properly.
Ice forms on the indoor unit or pipes.
There is a strong musty smell.
The leakage occurs repeatedly.
The indoor unit makes unusual sounds.
Water is leaking near electrical connections.
The drainage pipe appears damaged or disconnected.

Avoid dismantling the indoor unit or attempting to repair refrigerant-related problems yourself. Aircon repair requires appropriate tools, technical knowledge, and safe handling procedures.

Conclusion

If your aircon is leaking water after servicing, the problem may be related to a blocked drainpipe, an incorrectly fitted drain pan, poor drainage, frozen coils, or an existing installation fault. Servicing can help improve system cleanliness and performance, but a recurring leak requires a proper diagnosis.

The best solution is to switch off the affected unit, protect your property, and contact a qualified technician for inspection. With regular aircon general servicing, suitable cleaning, and timely repairs, homeowners can reduce the risk of water leakage and maintain a more comfortable indoor environment.

For professional aircon servicing, aircon chemical wash, aircon repair Singapore, aircon installation Singapore, and other aircon maintenance needs, LetsCool Aircon is a service provider to consider. Proper maintenance and early attention to warning signs can help keep your aircon operating efficiently throughout the year.

Aircon Installation Singapore

11 Mandai Estate,

#05-15 Eldix,

Singapore 729908

Mail ID: [email protected]

Service -WhatsApp Call: +65 9862 3678

Installation - WhatsApp Call: +65 94507178

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