Coming home to find water dripping from your aircond onto the floor, furniture, or worse — your expensive electronics — is every Malaysian homeowner's nightmare. It's one of the most common aircond complaints we get, and the good news is that most causes are fixable without major expense.
Understanding why your aircond is leaking water inside the room helps you determine whether it's an emergency or something that can wait for a scheduled service call.
How Your Aircond Produces Water
First, some background. Your aircond doesn't just cool air — it also removes moisture from it. Warm, humid Malaysian air passes over the cold evaporator coil, and the moisture in the air condenses on the coil surface (just like how a cold drink glass gets wet on the outside). This condensation water drips into a collection tray (drain pan) underneath the coil and flows out through a drain pipe to the outside of your building.
A healthy aircond in Malaysia produces 1-3 litres of condensate water per hour, depending on humidity. When everything works, this water quietly exits through the drain. When something goes wrong with this drainage process, the water has nowhere to go — so it overflows inside your room.
Common Causes of Indoor Water Dripping
1. Clogged Drain Pipe (Most Common)
This accounts for about 70% of all indoor water drip cases. Over time, the drain pipe accumulates dust, algae, and slime — a result of the warm, wet environment inside the drain line. Eventually, the pipe gets partially or fully blocked, and water backs up into the drain pan until it overflows.
Fix: Professional drain flushing. A technician will use pressurised water or a pump to clear the blockage. Cost: RM80-150 as a standalone service, or included in regular servicing.
2. Dirty Evaporator Coil
When the evaporator coil is coated in dust, the water doesn't drip cleanly into the drain pan. Instead, it clings to the dust and gets directed along the coil fins in unpredictable directions — some of it misses the drain pan entirely and drips from the edges of the unit.
The most common cause of indoor water drips is a clogged drain line, which happens when dust and algae accumulate over time. This is easily preventable with regular professional servicing that includes drain line flushing.
Fix: Evaporator coil cleaning. This is part of standard aircond servicing.
3. Frozen Evaporator Coil
When the evaporator coil freezes over (due to low gas, restricted airflow from clogged filters, or a faulty fan), a thick layer of ice forms on the coil. When the aircond cycles off or the ice gets too thick, it melts rapidly — producing a large volume of water all at once that overwhelms the drain pan.
You can identify this by checking the coil when the aircond is running — if you see ice formation, turn the aircond off and call a technician. Read more about this in our detailed leaking water guide.
4. Tilted or Misaligned Indoor Unit
The indoor unit must be mounted with a very slight tilt towards the drain side — this ensures water flows towards the drain outlet. If the unit has been bumped, if the wall bracket loosened, or if the installation was done incorrectly, the unit may tilt the wrong way, sending water towards the opposite end where it drips from the unit.
Between professional services, you can take steps to prevent drain blockages yourself. Our guide on maintaining your aircond between services includes tips for keeping the drain path clear.
Fix: Re-levelling the indoor unit. A technician adjusts the mounting bracket to restore the correct tilt.
5. Cracked or Disconnected Drain Pan
In older units (7+ years), the plastic drain pan can crack from thermal cycling — repeated heating and cooling makes plastic brittle over time. A crack allows water to drip directly from the pan instead of flowing to the drain outlet.
Fix: Drain pan replacement (RM100-300 depending on model availability).
6. Insulation Issues on Piping
The copper pipes connecting your indoor and outdoor units carry very cold refrigerant. These pipes are wrapped in insulation foam to prevent condensation on the pipe surface. If the insulation is damaged, degraded, or was poorly installed, moisture from the air condenses on the cold pipe — and drips inside the wall or from the pipe entry point.
Sometimes water dripping is actually caused by a frozen coil that's melting faster than the drain pan can handle. If you see ice on the unit before the dripping starts, the root cause is likely a frozen evaporator coil rather than a drain issue.
🚨 Emergency vs Non-Emergency
Can wait for scheduled service: Slow drip, small amount of water, unit still cooling normally
Call a technician soon: Steady drip, water pooling on floor, happening every time unit runs
Turn off immediately: Large volume of water, ice visible on coil, water near electrical outlets or equipment
Quick Temporary Fix
While waiting for a technician, you can try this: turn off the aircond and locate the drain pipe outlet outside your building. Use a wet vacuum or even just blow into the pipe (carefully) to dislodge minor blockages. If water starts flowing freely from the outlet, the blockage was in the drain pipe and you've temporarily cleared it.
This is a temporary fix — the blockage will likely recur without proper professional cleaning.
Prevention
Regular servicing is the best prevention. During each service, the technician flushes the drain line, cleans the drain pan, and checks the coil condition. With quarterly servicing, drain blockages are caught and cleared before they cause water damage.
Our aircond repair service handles all water leak issues across Tropicana and the wider KL/Selangor area.
Aircond Dripping Water Inside?
Water damage gets expensive fast. Get it fixed before it ruins your ceiling, walls, or furniture.
In a separate case in Mont Kiara, the drainage pipe itself had been installed with an incorrect slope, causing water to pool and overflow. Read how we re-routed the drainage.
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