A dripping indoor unit is one of the most common aircon problems in Malaysian homes — and one of the most searched. The good news: some causes are simple. The bad news: ignoring a leak can damage walls, flooring and the unit itself. This guide explains why your aircon is leaking water, what you can safely check yourself, and when it’s time to call a technician for professional aircon repair.
Why aircon units drip water in the first place
Condensation is completely normal. Warm, humid air hits the cold evaporator coil, water droplets form, and that water should drain away harmlessly through the drainage pipe to the outside. A leak simply means that water is escaping somewhere it shouldn’t — the drainage path is blocked, overwhelmed, or broken.
7 common causes of an aircon leaking water
Almost every indoor leak comes down to one of these seven causes:
- Blocked drainage pipe (most common). Dust, algae and jelly-like slime build up inside the drain pipe — fast in Malaysia’s humidity — until the water has nowhere to go and overflows indoors.
- Dirty air filter or dirty coil. Restricted airflow lets ice form on the coil; when it melts, the excess water overflows the drain pan.
- Clogged or dirty drainage pan. The pan that catches condensation gets gunked up and can’t channel water to the pipe.
- Low refrigerant (gas). Low gas pressure makes the coil freeze, and the resulting meltwater overwhelms the drainage system.
- Poor installation. If the unit isn’t level or the drain pipe slopes the wrong way, water pools instead of flowing out — a classic cause when a newly installed unit leaks.
- Damaged or cracked drain pan, or a loose drain connection. Physical damage lets water escape before it ever reaches the pipe.
- High humidity plus a very low temperature setting. Running at an extremely low temperature for hours in humid weather creates condensation faster than the drain can handle.
Safe DIY checks before you call anyone
These checks are safe for any homeowner — no tools or technical skills needed:
- Switch off and clean the air filter. A clogged filter is the easiest fix of all. See our guide on how often to service your aircon in Malaysia for the right schedule.
- Look for visible ice on the coil. If the coil has iced up, switch the unit off and let it melt fully before restarting.
- Check the drain hose outlet. Find where the drain hose exits (usually at a balcony or outdoor wall) and make sure it isn’t blocked, kinked or submerged in water.
- Don’t run at an extremely low temperature for hours. Give the drainage system a chance to keep up.
Safety note: do NOT open the unit casing or touch any electrical parts. Refrigerant work and internal cleaning must be handled by a trained technician.
When a leak is serious (call a technician)
Call a professional if any of these apply:
- Water keeps dripping even after you’ve cleaned the filter
- Ice keeps forming on the coil
- The leak comes with weak cooling or strange smells
- Water is already damaging your wall paint or flooring
- The unit is newly installed and leaking (likely an installation slope problem)
A technician will find the real cause — whether it needs aircon repair, a deep-clean chemical wash, or simply overdue aircon servicing — and fix it before the damage spreads.
What does it cost to fix an aircon leaking water in Malaysia?
Based on 2026 market surveys of Malaysian aircon providers, here are the typical market price ranges for leak-related fixes. Please note: these are market ranges, not CoolFix’s own prices:
- Drain pipe cleaning/flushing: RM80–RM150
- General servicing (often solves dirty-coil leaks): RM80–RM150 per unit
- Chemical wash (deep clean): RM120–RM250 depending on HP
- Drain pan repair/replacement: RM100–RM300
- Gas top-up (if low refrigerant is the cause): RM100–RM250
Prices vary by unit size and condition — a proper inspection finds the real cause first. CoolFix Aircon offers free inspection, so you’ll know exactly what’s wrong before spending a sen.
How to prevent leaks
- Service every 4–6 months in Malaysia’s humidity — see how often to service your aircon in Malaysia.
- Book a chemical wash when cooling weakens or musty smells appear.
- Keep filters clean monthly — a two-minute job that prevents most blockages.
- Insist on proper installation with the correct drainage slope — see our aircon installation service.
Conclusion
An aircon leaking water is rarely an emergency, but it’s never something to ignore — what starts as a drip can end as damaged walls, flooring, or a burnt-out unit. Work through the safe checks above, and if the leak persists, get a technician to diagnose it properly.
For the best aircon service in Petaling Jaya, WhatsApp CoolFix Aircon today for free inspection and 100% satisfaction, guaranteed.
