When your AC starts leaking water, it can be frustrating—and sometimes even scary—especially if it’s dripping inside your home. Whether your air conditioner is leaking water inside the house, around the AC vent, or the AC unit is leaking water outside, the problem usually points to a few common issues.

In this guide, you’ll learn why your AC leaks water, the most common causes, and what you can do before calling a technician. These tips work for split AC, window AC, and central air systems.

Why Is My AC Leaking Water?

Your AC naturally creates water while cooling. Normally, this water drains safely through a pipe.
But when something blocks, breaks, or freezes, the water has nowhere to go—so it leaks.

Here are the most common reasons your AC unit is leaking water:

 1. Clogged Drain Pipe

This is the number one reason behind AC water leakage.

Dust, algae, or dirt can block the drain pipe, causing water to overflow and drip inside the room.

 Signs: 

• AC water dripping from indoor unit

• Water leaking from air vent

• My AC is leaking water even when turned off

  
  

Fix:

Try cleaning the drain outlet gently from outside. If water still doesn’t flow, call a technician.

2. Dirty Air Filter

If the filter is clogged, airflow reduces. When the coil doesn’t get enough air, it freezes.
When ice melts — your AC starts leaking water inside the house.

Fix:

Clean or replace filters every 30 days during summer.

3. Low Refrigerant (Gas Problem)

Low refrigerant cools inefficiently, causing coils to freeze. Once they melt, you’ll see AC vent leaking water.

Signs:

• Weak cooling

• Hissing or bubbling noise

• AC water leak inside house

Fix:

Only a technician can refill gas properly.

 4. Loose or Damaged Drain Pan

If your air conditioning unit is leaking water from the bottom, the drain pan may be cracked or rusty.

Fix:

A drain pan replacement is needed—usually quick and affordable.

5. Improper Installation

If your AC unit is tilted, water won’t flow correctly, causing it to drip indoors.

Fix:
Adjusting the indoor unit’s level usually solves it.

6. Frozen Evaporator Coils

Ice build-up melts and creates excess water.

This often happens in:

• Central air conditioners

• Split AC units

• Window AC units

  
  

Fix:
Turn off AC for 2–3 hours, then restart. If freezing repeats, call atechnician.

AC Leaking Water Inside vs. Outside — What’s Normal?

AC Leaking Water Inside the House

❌ Not normal

Usually means blocked drainage, dirty filters, or gas issues.

AC Unit Leaking Water Outside

✔ Normal — but only when AC is running

❌ Not normal if:

• Water flows continuously

• AC isn't cooling

• Water smells or is muddy

When to Call a Professional?

You should call a technician immediately if:

• Water leakage is constant

• AC isn’t cooling

• Water is leaking from the air vent

• You see ice on the outdoor or indoor unit

• Your AC keeps turning on/off automatically

A professional will:

✔ Clean drain pipe
✔ Test refrigerant pressure
✔ Service coils & filters
✔ Check electrical components
✔ Prevent future leakage

Need Fast AC Repair in Kathmandu, Lalitpur, or Bhaktapur?

If your AC water is leaking, Digital Marmat provides:

• AC servicing

  AC repairGas

  refillCoil

  cleaning

  Emergency leak fix

• 6-month service warranty

• Service in 3 hours

• 
  

We cover Kathmandu, Lalitpur, and Bhaktapur.

 Frequently Asked Questions (FAQs)

1. Why is my AC leaking water inside the house?

Blocked drainage or dirty filters are the most common causes.

2. Is it safe to use AC if water is leaking?

No. It can damage internal components and create mold.

3. My AC unit is leaking water outside — is this normal?

A small amount is normal. Excessive leakage is not.

4. Can gas leakage cause AC water leakage?

Yes. Low refrigerant can freeze coils, causing water overflow.

5. How do I fix AC water leakage at home?

Clean filters, check the drain pipe, turn off AC to melt ice. If leakage continues, call a technician.

 Final Thoughts

An air conditioner leaking water is a sign that something is wrong.
Fixing it early prevents bigger damage and saves money.

If you need help, Digital Marmat is always ready to solve your AC problems quickly and professionally.