# Why Is My Aircon Leaking Water? | PG1 Aircond Penang

> Aircon dripping water? Causes — clogged drain line, dirty coil, bad install slope — how urgent it is, and what a technician checks.

URL: https://aircondservicepenang.com/aircon-leaking-water/
Last-Modified: 2026-06-08

Aircon Guide

# Why Is My Aircon Leaking Water?

Aircon dripping water? Causes — clogged drain line, dirty coil, bad install slope — how urgent it is, and what a technician checks.

![Water dripping from a wall aircon onto a towel](/images/misc/water-dripping-from-wall-aircon-onto-towel-in-pena.webp)

You walk into your living room, step on a soggy patch of flooring, and realise you have an aircon leaking water indoors.

Our team at PG1 Aircond has spent over 15 years resolving cooling issues for local residents. That dripping water is actually a sign that your unit is doing its job by removing moisture, but the drainage system has failed.

Malaysia’s humidity hovers around 80% on most days. We need to break down the four most common reasons your unit is overflowing right now, look at the data, and explore a few practical ways to respond. If it does turn out to need a callout, here’s 

what to expect from an aircon repair

[/guide/what-to-expect-aircon-repair/ →](/guide/what-to-expect-aircon-repair/)

.

## Why your aircon makes water in the first place

Your air conditioning unit functions as a giant heat exchanger. The indoor evaporator coil gets extremely cold during operation. Warm air from your room cools down rapidly as it passes over this icy coil.

This temperature drop causes the moisture in the humid air to condense right on the metal, just like water beading on a cold glass of teh tarik. That liquid runs off the coil into a designated water tray. Gravity then pulls it from the tray through a small drain line to the outside of your building.

We see a typical 1.0 HP unit in Penang pull up to two litres of water per hour from the indoor air, based on local humidity data. That steady trickle proves the system is working perfectly. A leaking unit produces that exact same volume of water but simply cannot push it outside.

> **Pro Tip:** If your aircon is dripping water indoors, it is almost never a plumbing leak. It is simply trapped condensation that needs a clear exit path.

## Cause 1: Clogged drain line (most common)

The drain line is a narrow, flexible tube tasked with carrying condensation from the indoor unit to the outdoors. Over months of heavy use, this pipe becomes blocked.

Our technicians pull all sorts of strange things out of these pipes. The constant dampness creates a perfect breeding ground for blockages.

Here are the most common culprits we find during service calls:

-   **Algae and Biofilm:** The wet environment grows a thick, gelatinous slime that coats the pipe interior.
-   **Mould Buildup:** Dark, damp conditions near the drain outlet encourage heavy mould growth.
-   **Dust and Pet Hair:** These particles bypass dirty filters and wash down into the tube.
-   **Insect Nests:** We frequently clear out nests from mud wasps and drain flies that build inside exposed outdoor piping.
-   **Physical Kinks:** The flexible line can easily bend or pinch behind the indoor casing.

A pressure-flush clears the line completely. This takes about five minutes with professional tools and is included in any standard chemical wash.

You can attempt a temporary fix by blowing into the drain line from the outside outlet using a small straw. This quick trick sometimes dislodges the clog, but it often just pushes the blockage further upstream.

![Diagram of aircon drain line and water tray](/images/misc/diagram-of-aircon-drain-line-and-water-tray-labell.webp)

## Cause 2: Dirty water tray and coil (very common)

The water tray sits directly beneath the evaporator coil to catch every drop of falling condensation. This tray channels the liquid straight into the drain line.

Over time, this plastic pan gets coated with the exact same algae and mould that clogs the piping.

This buildup creates three distinct problems for your system:

1.  It physically restricts water from entering the narrow drain hole.
2.  The slime creates surface tension that holds water inside the tray.
3.  The drain point eventually closes up entirely.

A dirty coil also contributes heavily to this issue. Dust on the coil causes water to drip irregularly instead of channelling smoothly into the pan below. These combined factors result in a rapid overflow.

We highly recommend a full chemical wash to solve this. The technician will flush the tray, scrub the coil, and pressure-clear the drain line all in a single visit. This service easily resolves the vast majority of aircon leaking water complaints for popular brands like Daikin, Panasonic, and Midea.

| Component Status | Water Flow | Risk of Leaking |
| --- | --- | --- |
| Clean Tray & Coil | Smooth, continuous drainage | Very Low |
| Minor Dust Buildup | Irregular dripping, slow drainage | Moderate |
| Heavy Algae/Biofilm | Water pools and overflows tray | High |

## Cause 3: Wrong installation slope (less common but persistent)

Your indoor unit requires a very specific mounting angle to function properly. The side containing the drain connection must sit slightly lower than the opposite end.

This slight slope allows gravity to pull the condensation straight into the exit pipe. An air conditioner mounted perfectly level will allow water to pool, and a unit sloped in the wrong direction is guaranteed to overflow on your wall.

You can often diagnose this specific issue through a few clear signs:

-   The leak remains constant during heavy use.
-   A recent chemical wash did not fix the dripping.
-   The water pools heavily on the side opposite the drain pipe.

Fixing this requires re-mounting the entire indoor unit. A technician must unmount the system, reposition the metal bracket on the wall, and secure the unit at the correct downward angle.

If you are dealing with an aircon water leak, Penang service data shows that proper re-mounting typically costs between RM250 and RM350, depending on the unit size and wall type. This is a bigger job than a standard cleaning service, but it permanently solves the pooling issue.

![Technician pressure-flushing an aircon drain line](/images/misc/technician-pressure-flushing-aircon-drain-line-to-.webp)

## Cause 4: Frozen coil (uncommon, more serious)

Ice forming on your indoor evaporator coil is a major red flag. This freezing usually occurs due to severely restricted airflow or low R32 refrigerant gas.

The ice builds up while the compressor runs. When the unit cycles off, that solid block of ice melts very rapidly, overwhelming the tray and spilling directly out of the casing.

We usually identify this issue by asking about the leak pattern.

You will typically notice these specific symptoms:

-   The system stays completely dry for hours.
-   A sudden and massive gush of water follows.
-   The room experiences a severe drop in cooling power.

Repairing a frozen coil requires professional diagnostics. A system with low gas needs a thorough leak trace and a proper refrigerant refill.

A system suffering from blocked airflow usually requires an intensive chemical overhaul. Both of these solutions fall strictly into professional 

aircon repair

[/aircon-repair/ →](/aircon-repair/)

 territory.

## How urgent is it?

An indoor water leak rarely qualifies as a midnight emergency. You can usually manage the situation until normal business hours.

Some situations do require immediate action to prevent costly property damage. Shut the system down immediately if you notice any of these critical warning signs:

-   Water is dripping directly onto televisions, computers, or near electrical sockets.
-   Moisture is soaking into a wooden floor or a plaster ceiling.
-   The unit is located in a commercial retail space where slipping is a hazard.

A typical leak onto a tiled bedroom floor can wait a few days for a scheduled service slot. Just do not ignore the problem for weeks on end.

Persistent moisture around your air conditioner leads to secondary issues.

You will eventually face:

-   Blistering paint on the surrounding walls.
-   Dark mould spreading across your plaster.
-   Permanent structural staining.

## Temporary holding measures

You need to protect your floors and walls while waiting for a professional technician. A few simple steps will keep your room safe from water damage.

Our service teams recommend taking these immediate actions before help arrives:

-   **Deploy a catch container:** Place a wide bucket or thick towels directly beneath the main drip point.
-   **Cut the power:** Switch the unit off at the wall if the overflow is heavy or erratic.
-   **Limit usage:** Only run the cooling system in short bursts if you absolutely must use it.
-   **Empty the tray:** If you can safely reach the indoor water pan, gently soak up the standing water with a sponge. Be careful, as these plastic parts become very brittle over time.

## Booking

Deciding between a simple repair and a full cleaning service is usually straightforward. 

Book a repair

[/aircon-repair/ →](/aircon-repair/)

 if your unit is freezing up, flashing error lights, or suffering from a poor installation angle.

Schedule a 

chemical wash

[/chemical-wash/ →](/chemical-wash/)

 if your system is just dripping water and has not been thoroughly cleaned in the last twelve months. We always start with a chemical wash to fix an aircon leaking water, as the included drain flush and tray scrub resolve the vast majority of blockages.

Snap a quick photo of your indoor unit showing exactly where the water is escaping. WhatsApp that image to our support line with a rough estimate of the leak volume. The team will review the situation, identify the likely culprit, and secure your next available service slot.

## Frequently asked questions

Why is my aircon dripping water indoors?

Most commonly a clogged condensate drain line or a dirty water tray backing up. Less commonly, a wrong installation slope. All three are fixable — usually during a chemical wash.

Is a leaking aircon urgent?

Moderately. It's not a same-day emergency unless the water is dripping onto electronics or causing ceiling damage. But it does need fixing within a week or two — water leaks lead to wall staining and mould.

Can I fix the leak myself?

Minor temporary fixes yes — empty the water tray if accessible, or clear visible debris from the drain outlet outside. Persistent leaks need a technician with a pressure flusher and chemical wash setup.

## Need to act on what you just read?

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