Why Is Your AC Leaking Water? Causes and Quick Solutions

As temperatures soar in India, air conditioners turn into an essential survival tool. But while enjoying cool comfort, you may suddenly spot water pooling beneath your indoor unit. It can be alarming and confusing. If you’ve been wondering, “What are the main causes of AC leaking water?”, this blog will help you decode the problem and fix it before it leads to more serious damage.

In Indian homes, especially during peak summer or humid monsoons, AC water leakage is quite common. Whether it’s a split AC or window unit, water should ideally flow through the drainage pipe—not into your living room! Let’s understand why this happens and how to tackle it efficiently.

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Key Reasons of Water Leaking from AC

Water leakage is often a sign of an internal issue in your AC system. Let’s explore the most common causes of AC leaking water, the warning signs to watch out for, and simple steps you can take to fix the problem.

1. Clogged Drain Pipe

Over time, dust, dirt, mold, and even insect nests can clog the AC’s drain pipe. When this happens, the condensed water cannot escape, and it starts backing up into the unit.

Symptoms: Water dripping from the indoor unit, damp smell, mold growth.

Solution: Use a wet/dry vacuum to suck out the blockage or flush the pipe with a mild bleach solution. Some modern ACs have alarms for blocked drainage.

Cost in India: ₹200 to ₹600 (if done by a technician).

2. Frozen Evaporator Coils

Evaporator coils are meant to absorb heat from the air, not freeze. But due to low refrigerant levels or dirty air filters, the coils can ice up. When the ice melts, water drips out uncontrollably.

Symptoms: Weak airflow, frost build-up on indoor unit, AC not cooling efficiently.

Solution: Turn off the AC to let it defrost. Clean the air filter or have a technician check refrigerant levels.

Cost in India: Cleaning – ₹300 to ₹500; Gas refill – ₹1,500 to ₹3,000.

3. Low Refrigerant Levels

Your AC’s cooling efficiency drops when the refrigerant is low. This causes the temperature around the coils to drop too low, leading to freezing. Once the ice melts, it results in water leakage.

Symptoms: Gurgling noises, less cooling, frozen coils.

Solution: Recharge refrigerant only through an authorized service professional. Avoid DIY here.

Cost in India: ₹2,000 to ₹3,500 depending on gas type.

4. Poor Installation

If your AC was installed without proper tilt towards the drainage outlet, water won’t flow out naturally and will begin leaking.

Symptoms: New unit leaking within days of installation.

Solution: Reinstall or adjust the angle of the indoor unit so it slopes gently toward the drainpipe.

Cost in India: ₹400 to ₹1,000 (depending on reinstallation).

5. Rusted or Cracked Drain Pan

In older ACs (more than 8–10 years), the drain pan may corrode. Water collects in this tray before exiting through the pipe. A crack here means water leakage.

Symptoms: Water marks on the wall, constant dripping, old unit.

Solution: Replace the drain pan. Most brands sell replacements specific to model numbers.

Cost in India: ₹500 to ₹1,200

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6. Dirty Air Filters

Blocked filters obstruct air circulation, causing the coils to freeze. Once the ice melts, water leaks out of the vents or unit casing.

Symptoms: Dusty smell, uneven cooling, water drips.

Solution: Wash filters every 2–3 weeks in peak season. Replace once every year.

Cost in India: ₹200–₹500 (for replacements).

7. Extreme Humidity Levels

High humidity regions like Mumbai or Chennai experience constant moisture in the air. Your AC works overtime to dehumidify, and if the drainage system isn’t fast enough, water spills over.

Symptoms: Dripping even when cooling is working.

Solution: Use the Dry Mode on humid days. Get a technician to check drainage speed.

Cost: No cost unless the drain line needs upgrading.

Quick Solutions for AC Leaking Water

Note: Prices vary based on location and the type of service.

Preventive Maintenance Tips

Now that you know the reason for AC water leakage, it’s just as important to follow preventive maintenance tips to help avoid the issue altogether.

• Schedule annual AC servicing before summer begins.
• Use a water alarm sensor to detect early leaks.
• Clean filters every 15-30 days in peak usage.
• Ensure your AC is installed on a level surface.
• Check the drainage system every few months.

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When to Call a Professional

If water leakage persists even after basic cleaning, it’s best to call a certified technician. Tampering with refrigerants or internal parts without expertise can worsen the issue.

Features of Modern ACs That Reduce Water Leakage

• Self-Clean Technology: Prevents mold and blockage inside coils.
• Hydrophilic Fins: Allow faster drainage of water.
• Auto Drain Function: Eliminates excess moisture buildup.
• Smart Sensor Alerts: Warn about clogs or freezing.

Description vs Features

Description: Most ACs today are equipped with anti-fungal filters, copper condensers, and advanced thermostat controls to optimize cooling and durability. They also prioritize energy efficiency through star ratings.

Features:

• Copper condenser for better heat exchange
• Anti-bacterial coating for hygiene
• 3-in-1 convertible modes for energy saving
• Smart app connectivity for remote monitoring

Conclusion

The reason of water leaking from AC can range from simple blockages to more technical malfunctions like refrigerant loss. Addressing small signs early—like strange noises, low cooling, or a minor drip—can help you avoid expensive repairs later. In India’s diverse climate, your AC has to work hard. Treat it with care.

And if your current air conditioner is beyond repair or requires frequent maintenance, consider exploring verified second-hand ACs on OLX. It’s a smart, budget-friendly way to upgrade without compromising on quality.

Ready to fix your leaking AC? Visit OLX today and make cooling worry-free again!

Frequently Asked Questions

What is the most common reason for AC water leakage?

The most common reason is a clogged drain pipe. Dirt or mold can block the pipe, causing water to back up and leak.

How do I know if my AC’s refrigerant is low?

If your AC is not cooling properly and you see water leaking or ice on coils, it may be due to low refrigerant levels.

Can I fix AC leakage myself?

You can clean filters and check for drain clogs, but for refrigerant issues or internal damage, professional help is recommended.

Does regular maintenance stop water leakage?

Yes. Scheduling AC servicing every 6–12 months helps prevent drain blockages, rust formation, and refrigerant issues — all common causes of water leakage.

Is water leaking from AC dangerous?

While the water itself isn’t harmful, it can damage walls, furniture, and cause mold, making it important to fix quickly.

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