Why Is My Aircond Leaking Water? 7 Causes & Fixes (2026)
You wake up to a wet floor and a damp patch on the wall under the unit. If you are asking "why is my aircond leaking water?", you are not alone. It is one of the most common aircond problems in Malaysian homes, especially once the monsoon brings more humid air.
Most cases come from simple causes, such as a clogged drain pipe or a dirty filter. This guide covers the 7 main causes, how to read the clue of where the water drips, safe first steps and when to call a professional.
Why Is My Aircond Leaking Water? The Short Answer
Your aircond makes water every time it cools a room, because moisture in the air condenses on the cold coil. This water should flow into a drain pan and out through the drain pipe. When the drain pipe is clogged, the pan overflows, the filter is too dirty or the unit is tilted, water spills out into your room.
Here are the 7 most common reasons an aircond leaks water:
Drain pipe clogged with dust, slime or mould
Drain pan dirty, overflowing or cracked
Dirty filter makes the coil freeze, then melt
Unit installed unevenly or drain pipe not sloped
Drain pipe disconnected, kinked or cracked
Low refrigerant gas freezing the coil
Room too humid or temperature set too low
Not sure which one is happening at home? Download the bTaskee app to check the price and book aircond cleaning in KL & Selangor in seconds.
7 Causes of a Leaking Aircond and the Signs of Each
1. A clogged drain pipe
This is the most common cause. Dust that slips past the filter mixes with water into slime, sometimes with mould or algae, and slowly blocks the small pipe at the back of the unit. The sign: a slow drip from the bottom front of the unit after a few hours of running.
The US Department of Energy explains that clogged drain channels stop an air conditioner from reducing humidity, and the extra moisture can discolour walls (US Department of Energy).
2. A dirty, full or cracked drain pan
The drain pan sits under the coil and catches the condensation. When it fills with dirt, water cannot reach the drain pipe, and a cracked pan drips even if the pipe is clear. It is hidden inside the unit, so a technician needs to open it up.
3. A dirty filter that makes the coil freeze
A dust-packed filter starves the coil of airflow, so it gets too cold and ices up. When the ice melts, a lot of water comes down at once and overflows the pan. The sign: weaker cooling and heavy dripping just after you switch off.
4. The unit is tilted or the drain pipe has no slope
Water flows by gravity. If the indoor unit tilts the wrong way, or the drain pipe rises before going down, water pools and overflows. This often shows up after a new installation, a move or renovation work on the wall.
5. A disconnected, kinked or cracked drain pipe
The drain pipe is usually a flexible hose running to an outside wall, balcony or drain. It can come loose at a joint, kink behind a wardrobe or crack in the sun. In terrace houses, a pipe end sitting in a flooded drain or under dry leaves can push water back.
6. Low refrigerant gas
Low refrigerant lowers system pressure and can freeze the coil, just like a dirty filter. The sign: weak cooling even with a clean filter, and frost on the copper pipes. Only a technician should top up gas. On bTaskee, a gas top-up is an add-on to aircond cleaning, at a standard 30 PSI.
7. A very humid room or a temperature set too low
During the northeast monsoon, roughly November to March, indoor air is very humid. With doors or windows open, the aircond pulls far more water from the air than usual. A very low temperature can also cause condensation on the louvres that drips onto the floor.
Where Is the Water Coming From? Find the Cause by Location
Where the water appears is a strong clue. Check this table before you call a technician.
| Where the water appears | Likely cause | What to do |
| Bottom front of the unit, slow and steady drip | Clogged drain pipe or full drain pan | Switch off, check the filter, book a cleaning |
| A lot of water at once after switching off | Frozen coil from a dirty filter or low gas | Clean the filter; if it repeats, have the gas checked |
| Drops on the louvres or water spitting with the air | Condensation from humidity, low temperature or a dirty fan | Close windows, set 26–28°C, book a cleaning |
| Wet wall behind or beside the unit | Drain pipe loose or leaking at a joint | Stop using the unit and call a technician |
| Only after a new installation or a move | Unit tilted or wrong drain pipe slope | Ask the installer to adjust the position |
What to Do When Your Aircond Is Leaking Water
These steps are safe to do yourself and help prevent bigger damage.
Switch off the aircond and its power at the wall switch or circuit breaker before you touch the unit.
Protect your things. Put a towel or container under the unit and move electronics, mattresses and wooden furniture away.
Wipe the floor straight away. Wet tiles are slippery, especially for children and elderly family members.
Check the filter. Lift the front panel; if the filter is full of dust, wash it, dry it in the shade and refit it.
Check the outside end of the drain pipe for leaves, rubbish or standing water. Never lean out of a high-floor window or balcony to check.
Do not pour chemicals into the unit. Bleach or strong cleaners can damage the coil and plastic parts.
Dry the wall and floor. The US EPA advises drying wet areas within 24–48 hours to prevent mould (US EPA).
Still dripping after a filter clean? The problem is probably inside the unit. Book aircond cleaning in the bTaskee app and write "aircond leaking water" in the booking notes.
When Should You Call a Professional?
DIY should stop at washing the filter and checking the drain pipe end. Call a professional if:
Water still drips after the filter is cleaned
There is ice or frost on the coil or pipes
Water runs down the wall or near a socket
The unit smells musty or has black spots on the louvres
The aircond is also not cooling well
bTaskee aircond cleaning is available in KL and Selangor, at the same price for every brand, with a 7-day warranty. Wall-mounted units start from RM144 (below 2HP) and RM173 (2HP and above), and a gas top-up add-on starts from RM70. See the latest aircond cleaning prices for other unit types, or learn how to book aircond service in 60 seconds.
Reference prices, October 2026; may vary by area, peak hours, weekends and public holidays. The exact price is shown in the app.
How to Stop Your Aircond Leaking Again
Most leaks can be prevented with a simple routine, especially before and during the monsoon:
Clean the filter every 2–4 weeks if you use the aircond nightly. The US Department of Energy suggests every month or two in the cooling season, more often in dusty homes, and in Malaysia that season lasts all year.
Service the aircond every 3–6 months, or every 1–2 months in dusty areas and every 2–3 months with heavy use.
Set 26–28°C. It is comfortable and lowers the risk of a frozen coil.
Keep doors and windows closed while the aircond is on.
Check the drain pipe end after heavy rain.
Keep furniture off the drain pipe so it does not get squashed.
A damp home also invites mould, so read our guide to preventing mould at home during the monsoon.
FAQ
Is a leaking aircond dangerous?
The water is only condensation, but it can damage walls and furniture and make floors slippery. The bigger risk is water near a socket or wiring, so switch off the power and call a technician if that happens.
Can I keep using an aircond that is leaking water?
It is better not to, because a wet wall grows mould quickly in humid weather. If it still drips after you clean the filter, book a cleaning so the drain pipe and drain pan can be checked.
Why is my aircond leaking water after servicing?
Sometimes the drain pipe shifts or a panel is not seated properly after a service. bTaskee aircond cleaning comes with a 7-day warranty, so report the problem within that period through in-app chat or the hotline 019-301 7988.
Does a leaking aircond mean it needs gas?
Not necessarily. Most leaks come from a clogged drain pipe or a dirty filter. Low gas usually comes with other signs, such as weak cooling and frost on the pipes, and it has to be checked by a technician.
Aircond Leaking Water? Book a Cleaning Today
A dripping aircond can damage your walls and encourage mould over time. Clean the filter first, and if it keeps leaking, let a bTaskee Tasker clean the unit with clear pricing and a 7-day warranty. Download the bTaskee app and book aircond cleaning in KL & Selangor today.
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