Why Is My Aircon Dripping Water? The Complete 2026 Singapore Guide
Stepping into a cold puddle on your bedroom floor or noticing damp patches and mould on the wall behind your unit is frustrating. Water dripping from the indoor fan coil unit is the single most common problem homeowners face in Singapore.
Most aircon leaks are fully fixable in a single visit. However, ignoring a leaking unit can lead to peeling paint, warped flooring, mould growth, and even severe electrical damage if water reaches the indoor unit’s Printed Circuit Board (PCB).
The 6 Primary Causes of Aircon Water Leaks
Your aircon naturally produces 1 to 3 litres of condensation per day during normal operation in Singapore’s humid climate. Water leaks occur when this condensation cannot exit properly:
- Clogged Drain Pipe (Most Common): Dust, bacteria, and algae combine in the humid drain line to form a thick gel-like sludge, causing condensation to back up and overflow from the drip tray.
- Dirty Air Filters: Clogged mesh filters restrict airflow, causing the evaporator coil to freeze into a block of ice. When the system is switched off, the melting ice floods the drip tray.
- Low Refrigerant Gas: Slow gas leaks drop system pressure, causing coils to freeze over. The resulting meltwater overpowers the drainage system.
- Damaged or Misaligned Drip Tray: Cracks from heat stress or a slight tilt in the drain pan cause water to spill over the sides instead of flowing down the drain pipe.
- Poor Installation Gradient: If the drain pipe lacks a proper downward slope (at least 1 cm drop per 1 m run), water sits flat and leaks out through the indoor unit.
- Uninsulated Copper Piping: Deteriorated foam insulation on refrigerant lines allows warm air to hit cold metal, creating external wall condensation that mimics an internal leak.
Matrix: DIY Immediate Action vs. Professional Repair
| Issue / Symptom | Immediate DIY Action | Professional Repair Solution |
|---|---|---|
| Active Water Dripping | Turn OFF unit immediately; place a bucket or towel underneath. | High-pressure vacuum flush or chemical drain clearing. |
| Coil Freezing / Ice Melt | Turn off unit to allow complete ice defrosting; clean air filters. | Perform chemical wash to clean deep coil fins and restore airflow. |
| Weak Cooling + Leaking | Verify if indoor filters are clean and free of dust build-up. | Nitrogen pressure test, locate gas leak, repair pipe, and recharge gas. |
| Uneven Water Spilling | Inspect indoor unit visually to see if it hangs level on the wall. | Realign or replace cracked drip tray with genuine manufacturer parts. |
| Wall Condensation | Wipe down wet surfaces and improve room air ventilation. | Replace damaged foam pipe insulation and re-wrap line sets securely. |
How to Prevent Future Aircon Leaks
Preventing water leaks requires consistent maintenance rather than waiting for a backup to flood your room. Routine quarterly servicing clears out accumulating sludge before it creates a complete blockage.
Key Maintenance Best Practices:
- Monthly Filter Cleaning: Wash mesh filters every 2 to 4 weeks to prevent airflow restriction and coil freezing.
- Quarterly Drain Flushing: Ensure your regular maintenance includes a high-pressure vacuum flush of the outdoor drain line.
- Annual Chemical Servicing: Schedule a chemical wash or overhaul once a year to clear stubborn bacteria and biofilm from internal coils and drip trays.
Need Professional Aircon Repair in Singapore?
If your air conditioner is dripping water or failing to cool properly, get expert support to restore your system and protect your property from water damage.
Contact Our Experts Today:
- Company Name: Aircon Servicing & Repair Singapore
- Address: 269 Bukit Batok East Ave 4, Singapore 650269
- Phone: +65 9855 3721
- WhatsApp: Chat on WhatsApp
