If you’ve noticed water pooling around your unit and you’re wondering why your aircon is leaking water, you’re not alone. Water leaks from air conditioners are a common issue that can stem from several causes. Some are minor, others require professional attention.
Why is water leaking from my air conditioner?
Air conditioners remove humidity from the air as part of their cooling process. The moisture they extract usually drains away through a condensate line. If anything interferes with that process (like a blockage or damage), the water can back up and leak. This is most common in apartments where routine servicing might be neglected, which you’ll need a qualified technician to fix.
Some external water leakage from the outside unit is caused by condensation forming and dripping which is normal, especially in humid conditions, with no action required. However, constant or excessive leaking may indicate a blocked pipe or refrigerant issue which requires a professional to attend to.
Here are the most common causes your air conditioner might be leaking water – inside your home or outside. We’ll also explain when to fix a leaking air conditioner yourself and when it’s time to call in an expert.
5 common causes of your air conditioner leaking water
1. Blocked or clogged drain line
A blocked condensate drain line is one of the most common causes of aircon leaks. Dust, mould or debris can build up and stop water from draining properly, leading it to overflow inside the unit.
2. Dirty or damaged air filters
A dirty filter restricts airflow, causing coils to freeze. When they thaw, the excess water may overwhelm the drip tray and leak.
3. Damaged or rusted drip tray
If your drip tray is cracked or corroded, it can’t hold the water draining from your system, which may explain why your air conditioner is leaking water.
4. Low refrigerant levels
Low refrigerant can cause your system to work harder, leading to freezing coils and excess condensation when they thaw. This may be why your AC is leaking water inside.
5. Evaporative cooling leaking water when off
This could indicate a faulty solenoid valve or a water line not shutting off properly. Turn off the water supply.
Each of these above scenarios require calling a qualified technician to fix.
Is water leaking from an air conditioner dangerous?
While the water itself is usually not harmful, leaks can cause electrical hazards, mould growth or structural damage if left untreated.
When to call a professional to fix your leaking air conditioner
- Constant and or excessive leaks
- Signs of electrical issues or corrosion
- Unusual noises, smells or performance drops
- Leaks from ceiling-mounted or ducted systems
How to prevent future leaks
- Schedule regular servicing (at least once a year)
- Clean or replace filters frequently
- Keep the area around the unit clean and dry
ActronAir support
While some minor problems can be resolved independently, it’s important to recognise when professional assistance is needed to fix the issue before it escalates. For more assistance from ActrionAir or for specific product advice, check out our support page.
