Why Is My Aircon Leaking Water Inside the House?

It always happens at the worst time. You walk into the lounge room, look up at the split system, and there is water running down the wall. Maybe it is pooling on the floorboards, maybe it is bubbling out of the front of the unit, maybe it is quietly soaking your gyprock.

The good news: in 9 cases out of 10, this is not a refrigerant problem or a dead aircon. It is a drain problem and it is very fixable.

What Is the Number One Cause of a Leaking Aircon?

Your split system pulls litres of moisture out of FNQ's humid air every day. That water is meant to run out a small drain pipe, usually exiting somewhere out the back wall.

Over time, that pipe fills with algae and biofilm that thrives in our warm climate, tropical dust, pollen and cane particles, mould fragments shedding from the evaporator, and the occasional unfortunate gecko.

Once the pipe blocks, the water has nowhere to go but back into the unit and then onto your floor.

What Other Causes Do We See in FNQ?

Not every leak comes from a blocked drain. Other causes we regularly find on the Cassowary Coast include:

• Dirty evaporator coil: a thick layer of mould and dust causes ice to form, which then melts and overflows the drip tray
• Incorrect installation slope: the unit needs to tilt very slightly toward the drain side and many older installs do not
• Cracked drip tray: UV and time take their toll, especially in coastal homes
• Frozen coil from low gas: less common, but possible if the unit is also blowing warm air
• Drain line exit underwater: we have found drain lines buried in wet-season puddles that are siphoning water back into the house

A professional aircon inspection will identify which of these is causing the leak and fix it in a single visit.

Is a Leaking Aircon Dangerous?

Yes, if left running. Water dripping inside the unit can reach electrical components quickly. A leaking aircon that runs unattended risks short circuits, ceiling damage, mould growth in wall cavities, and warped or stained floorboards.

The longer it runs while leaking, the more expensive the secondary damage becomes. Turn it off at the wall until it has been inspected.

What Should You Do Right Now?

If your aircon is leaking water inside the house, follow these steps immediately:

1. Turn the unit off at the wall
2. Place a towel or container under the drip
3. Do not run it again until it has been looked at

Do not poke wires or sticks up the drain line yourself. It is easy to puncture the line inside the wall cavity and that turns a simple drain flush into a much bigger repair.

How Do We Fix a Leaking Aircon on the Cassowary Coast?

When we attend a leaking aircon callout in Tully, Innisfail, Mission Beach, El Arish, Silkwood, Cardwell or anywhere on the Cassowary Coast, we typically:

• Pressure-flush the drain line from inside and outside
• Inspect and clean the drip tray
• Check the slope and condition of the line run
• Hydro-chemical clean the coil if it is contributing to ice or overflow
• Test the unit through a full cool cycle before we leave

Most leaking aircon callouts are resolved in a single visit. For units with heavy mould or coil contamination contributing to the leak, see our full aircon mould cleaning service for what that process involves.

How Do You Stop It Leaking Again?

A yearly hydro-chemical clean keeps the drain line and coil clear. Most leaks happen to units that have never been professionally serviced, because the build-up happens gradually and there are no obvious warning signs until the water appears.

Building a professional clean into your annual wet-season prep is the simplest way to avoid a repeat. Read our full guide on wet season aircon preparation for the Cassowary Coast to see what that involves and when to book.

Frequently Asked Questions

Why is my aircon leaking water inside the house?

The most common cause is a blocked drain line. When the drain pipe fills with algae, dust or mould, water backs up into the unit and overflows inside. A dirty coil that causes ice build-up and a cracked drip tray are also common causes in FNQ.

Can I fix a leaking aircon myself?

You can place a towel under the drip and turn the unit off, but drain line blockages and coil issues require professional equipment to fix properly. Attempting to clear the drain line yourself risks puncturing it inside the wall cavity.

How quickly can ACcleanQLD attend a leaking aircon?

Use our online booking tool to select the next available slot. Our two local technicians cover the full Cassowary Coast and most leaking aircon callouts are resolved in a single visit.

Will my aircon leak again after it is fixed?

Not if the underlying cause is properly treated. A hydro-chemical clean that clears the coil and drain line removes the source of the problem. Annual servicing prevents the build-up from recurring.

Does a leaking aircon mean I need a new unit?

In most cases, no. The majority of leaks on the Cassowary Coast come from drain blockages or coil contamination, both of which are fully repairable. Refrigerant or compressor faults are far less common.

Ready to Stop the Drip Today?

If your aircon is leaking right now, do not wait it out. Jump on our online booking tool, pick the next available slot, and one of our two local techs will be out to sort it.

Easier than mopping it up twice.

ARC Licensed – Lic. L194280