Why is my air conditioner leaking water?
Most AC problems come down to water. Here are the four most common reasons your split unit drips, and when to call a technician.
Most problems with air-conditioning systems involve water leaking. Even a small drip, left alone, can stain walls, damage ceilings and grow mould. Here are the usual suspects.
1. A blocked drain line
Your AC removes moisture from the air and drains it away through a small pipe. Dust, algae and even insects can block it, so the water backs up and drips from the indoor unit. This is the most common cause, and a technician can usually clear it during a routine service.
2. Dirty air filters
When filters are clogged, less warm air passes over the cooling coil. The coil gets too cold, freezes, then melts, and that water overflows the tray. Clean your filters every 2–4 weeks in the dry season.
3. Low refrigerant (gas)
Low gas also makes the coil freeze. If your AC blows weak or warm air and leaks, you may need a gas refill and a leak check.
4. Poor installation
If the indoor unit isn’t level, or the drain pipe doesn’t slope downwards, water can’t drain properly. This often shows up in the first weeks after installation.
When to call a pro
Switch the unit off and book an AC technician if:
- water is dripping onto electrical points or sockets,
- you see ice on the pipes or coil,
- the unit is making new noises or smells.
A service every 3–6 months keeps your AC efficient, saves power and helps it last longer.
