Why Is Your Air Conditioner Leaking Water Only On Rainy Days?

January 8, 2026

A soft “toc toc” dripping sound comes from the air conditioner… it’s easy to ignore at first, until the quiet makes every drop feel louder. Yes, your residential commercial air conditioning Gold Coast is leaking water only on rainy days. Discover the truth behind and find the solution with DEEPCHILL, your trusted air conditioning Gold Coast partner. 

Explore top 4 reasons why your AC leaking water only on rainy days

The drain line is clogged

Inside your air conditioner, condensation water is meant to flow out through a small drain pipe. But on rainy days, dust, leaves and dirt can get washed into the pipe. When it becomes blocked, the water has nowhere to go, therefore your AC leaking water only on rainy days.

The drain pan is damaged or overflowing

Beneath the cooling coil, there’s a tray that catches water before it drains away. If this tray is cracked, rusty or already full, the water can no longer drain properly. This often happens on humid, rainy days or when the commercial air conditioning Gold coast runs for long hours, causing water to spill over the edge and drip into your room.

A dirty air filter causes the coil to freeze and melt

When the air filter is very dirty, airflow is restricted. This makes the cooling coil get too cold and freeze into ice. Later, when the ice melts, usually after long use or when the weather shifts, a large amount of water is released at once. The pan and drain can’t keep up and the excess water leaks out.

Installation or drain hose issues (rainwater flowing back)

If the indoor unit isn’t level or the drain hose is poorly positioned, water can’t drain properly. During heavy rain, outside water may flow back into the unit, making it look like the AC is leaking inside.

Air conditioner leaking water on rainy day from indoor unit, highlighting drainage problems in air conditioning Gold Coast homes and commercial spaces.

AC leaking water only on rainy days? Here’s what helps

When your residential air conditioning Gold Coast leaking water only on rainy days, there are a few simple and safe things you can do first before calling a technician. 

Turn everything off and protect your room

First, turn off the AC using the remote or thermostat. If you can, switch off the breaker too. This helps stop more water from forming and keeps the system safe. Place towels, a basin or a bucket under the leak. Then, move nearby furniture or electronics out of the way to avoid water damage.

Take a quick look at the drain line

Find the small plastic drain pipe that carries water from the indoor unit to the outside.
If it’s easy and safe to reach, check whether the pipe is bent or blocked by dirt, algae or insects. If you have a small wet or dry vacuum, you can gently try to clear the blockage from the end of the pipe.

Stand to the side and see if the indoor unit looks level. If it’s noticeably tilted, water may not flow toward the drain and can leak inside. This isn’t something to fix yourself, but it’s worth noting for a technician.

When to stop DIY and call a technician

  • Call a technician if: the filter and drain line are clean but it still leaks, you see ice on the coil, you cannot reach parts safely, or water is damaging the wall/ceiling.
  • Do not open electrical panels, do not add gas/refrigerant and do not try big repairs yourself – this needs a trained AC technician and keeps your warranty safe.​

Fixing residential and commercial air conditioning Gold Coast leaking water only on rainy dayshelps prevent mold growth, water damage and unnecessary health risks in your home. Don’t let a small leak turn into a bigger problem. Call DEEPCHILL and let our trusted technicians take care of it!

Category: AC Repairing

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