Why Is My Air Con Leaking Water Inside? Causes & Solutions
You turn on your air conditioning expecting cool, dry comfort, but instead you notice dripping and a small puddle forming below the indoor unit. It’s not what you want to see on a hot summer day in Perth. If you have found your air conditioner leaking water inside, you’re definitely not alone.
The good news is that most leaks come from small, fixable problems. Catching them early helps you avoid water damage, mould and costly repairs. In this guide, you will learn why your air conditioner is leaking water inside, how to check for simple fixes and when it is best to call in a professional.
Why Air Conditioners Create Water
A little water from your air conditioner is normal. As warm indoor air passes over the cold evaporator coil, moisture condenses and drips into a drain pan. From there, it flows through a small pipe to the outside of your home.
When everything is working properly, this process happens quietly in the background. But if a blockage, crack, or misalignment occurs, that water can leak inside your home.
Common Causes of Your Air Con Leaking Water Inside
Several issues can lead to an air conditioner leaking indoors. Most are straightforward to fix once you know what to look for.
1. Blocked or Clogged Drain Line
This is the most common cause. Dirt, dust, or algae can block the small pipe that carries condensation away. When it clogs, water backs up and overflows the drain pan and escapes into the indoor unit.
What you can do
Turn the unit off and check the drain pipe outside. If water isn’t dripping while the air conditioner runs, a blockage is likely the culprit. Try gently flushing the pipe with warm water or using a wet-dry vacuum to clear it. If it’s still not draining, it’s best to have it professionally cleaned.
2. Damaged or Overflowing Drain Pan
The drain pan sits under your unit and catches condensation before it drains outside. Over time, it can rust, crack or shift out of place. Once that happens, water escapes instead of draining away.
What you can do
If you notice water collecting below the unit, turn it off and dry the area. This issue needs professional attention. The technician can inspect and replace the pan if needed. It is a quick, affordable fix that prevents future leaks.
3. Dirty or Blocked Filters
Airflow is essential for your air conditioner to work efficiently. When filters become clogged with dust or pet hair, air can’t move freely over the coil. The coil gets too cold, freezes over, and when it thaws, the excess water can overflow.
What you can do
Remove and clean the filters every one to three months, depending on how often you use your air con. If you live near the coast or have pets, clean them more frequently. Clean filters help airflow, improve cooling and prevent leaks.
4. Low Refrigerant Levels
When refrigerant levels drop, the system pressure changes. This can cause the coil to freeze, and when it melts, water may leak from the indoor unit.
What you can do
Low refrigerant usually points to a leak. Only a licensed technician can repair this. Turn the system off and book a service instead of trying to top it up yourself.
5. Poor Installation or Uneven Positioning
If your indoor unit is not level or the drain line was not installed correctly, water might not flow properly to the drain. It can pool on one side of the pan and eventually leak inside.
What you can do
Check if your wall-mounted unit is tilted. If it looks uneven, do not try to adjust it yourself. A qualified installer can safely realign and reseal it.
6. Humid Weather and Condensation
In humid conditions, your system naturally produces more condensation. Some dripping outside is normal, but if you see water indoors, it usually means a blocked drain or restricted airflow. High humidity can push a minor issue over the edge.
What to Do If Your Air Con Is Leaking Water Inside
If you have noticed your air con leaking water inside, don’t panic. Try these simple checks before calling for help:
- Turn off the system to stop the leak and stay safe.
- Clean or replace the filters. This is often the easiest fix.
- Check the drain pipe. Look outside for the outlet; if it’s not dripping, a blockage is likely the cause.
- Let the system thaw. If ice has formed on the coil, give it time to melt before restarting.
- Dry the area. Wipe up any standing water to prevent mould or stains.
If the leak continues or you can’t find the cause, it’s time for a professional inspection.
Why Quick Action Matters
Even a small leak can lead to major problems if ignored. Water can soak into walls or ceilings, damage insulation and create the perfect environment for mould. A leaking air conditioner also works harder to cool your home, wasting energy and increasing your power bills.
Fixing the problem early keeps your air conditioner efficient, your home dry, and your repair costs low.
When to Call a Professional
Some causes are simple, but others need a professional touch. You need to book a technician if:
- Water keeps leaking after you clean the filters or the drain line
- There is dampness around the ceiling or walls
- The air con is not cooling as well as it should
- You hear hissing, bubbling or dripping sounds
- You notice a musty smell from the vents
A licensed technician, like any of our team at iBreeze, can check your drain line, test for refrigerant leaks and make sure the system is draining correctly.
How to Prevent Future Water Leaks
A few simple habits can keep your system running smoothly all year round.
1. Schedule Regular Servicing
Have your system serviced once a year, ideally before summer. A technician will clean drains, inspect coils and identify small issues before they cause leaks.
2. Keep Filters Clean
Clean filters keep airflow strong and moisture under control, helping your air conditioner run more efficiently.
3. Maintain Airflow
Keep vents clear of furniture and curtains. Unrestricted airflow improves performance and reduces the chance of leaks.
4. Watch for Early Warning Signs
Drips, unusual noises or patchy cooling often mean something is starting to go wrong. Taking action early saves time and money.
5. Ensure Proper Installation
When installing or replacing a system, always choose a licensed technician. Having a proper drainage setup in place is critical to preventing leaks later on down the line.
Expert Help When You Need It
If your air conditioner keeps leaking water inside even after you have checked the basics, it is time to bring in a professional air conditioning specialist. A qualified technician can find the cause quickly, fix it properly and help prevent it from happening again.
For homeowners and businesses in Mandurah, Rockingham and Baldivis, we provide complete air conditioning maintenance and repairs. From clearing blocked drains to fixing refrigerant leaks, our licensed technicians are here to keep your system running safely and efficiently.
Don’t let a small drip turn into water damage or an unexpected bill. Book your air conditioning service with iBreeze today, and we’ll make sure your system is ready to handle the summer heat.
Frequently Asked Questions
Q. Can I still use my air con if it’s leaking water inside?
Ans. It’s best to switch it off straight away. Continuing to run a leaking air conditioner can cause more water damage and increase the risk of electrical faults. Turn it off, dry the area if needed and contact a professional to check the system before using it again.
Q. What if water is leaking from the ceiling near my ducted vents?
Ans. This usually means water has pooled in the ductwork or ceiling cavity, often due to a blocked drain or a split in the internal unit. Turn the system off immediately and call a licensed technician to inspect it before damage spreads.
Q. Why does my air con only leak when it’s humid?
Ans. High humidity means more moisture in the air. Your system works harder to remove it, producing extra condensation. If the drain is partly blocked or the airflow is restricted, that extra moisture can cause water to leak inside.
