Common Causes of Indoor AC Unit Water Leaks and How to Fix Them

Know why is your AC unit leaking water learn effective ways to fix them. Learn expert tips, troubleshooting ways to keep your ac running smoothly and prevent future leaks. Check out exclusive offers on top AC brands and upgrade to a better cooling solution today.
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3 min
25-Sep-2025

Water dripping from a split AC indoor unit is a common issue that troubles many users. You may notice it during hot summers, daily use, or even when the unit is new. For some, it disrupts comfort at home, while for others it affects productivity in offices or shops.

If the issue persists and you decide to buy a new AC, check your loan eligibility first. It helps you understand your budget and narrow down your options. Once you have a budget in mind, explore the latest models on Bajaj Mall. Simply visit any of Bajaj Finserv’s 1.5 lakh partner stores in over 4,000 cities, choose the model you want, and convert your purchase into Easy EMIs of up to Rs. 5 lakh. With Easy EMIs and zero down payment on select models, bringing home the right AC is simple and stress-free.

Common reasons for indoor AC water leaks

Indoor AC water leaks can be caused by several common issues. A clogged condensate drain line is one of the primary reasons, as it prevents water from draining properly. Low refrigerant levels can also cause the evaporator coil to freeze and then thaw, leading to water overflow. Additionally, a dirty air filter can restrict airflow, causing the evaporator coil to freeze. Poor installation or a malfunctioning condensate pump may also lead to leaks.

For temporary cooling solutions, consider a portable ACs as an alternative.

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How to fix a leaking indoor AC unit

  • Check the condensate drain line: Ensure that the drain line is not clogged. Use a wet/dry vacuum or a stiff brush to clear any blockages.
  • Inspect the air filter: A dirty air filter can cause the evaporator coil to freeze. Replace the filter if it is dirty.
  • Check refrigerant levels: Low refrigerant can cause the coil to freeze and then thaw, leading to leaks. Contact a professional to check and refill refrigerant if needed.
  • Examine the condensate pump: Ensure that the pump is working correctly. If it is malfunctioning, it may need to be repaired or replaced.
  • Verify proper installation: Ensure that the unit is installed correctly, with no tilting or misalignment that could cause water to leak.
  • Maintain regular service: Schedule regular maintenance to prevent issues that can cause leaks.

For smaller spaces, consider a 1-ton ACs.

Preventing water leaks in your AC

  • Regular maintenance: Schedule periodic maintenance checks to ensure your AC are functioning correctly and prevent leaks.
  • Clean the condensate drain line: Regularly clean the drain line to prevent blockages that can cause water leaks.
  • Replace air filters: Change the air filters every 1-3 months to maintain proper airflow and prevent the evaporator coil from freezing.
  • Check for refrigerant leaks: Ensure that there are no refrigerant leaks that can cause the coil to freeze and lead to water overflow.
  • Proper installation: Make sure that your AC unit is installed correctly to avoid water leakage issues.

If considering an upgrade, explore options like a 1.5-ton AC for better efficiency.

Also read - How wi-fi-enabled ACs work and their benefits

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Frequently asked questions

Why is my split AC dripping water inside?

Your split AC may be dripping water inside due to a clogged condensate drain line, causing water to back up and overflow. Other common reasons include dirty air filters, low refrigerant levels causing the evaporator coil to freeze and thaw, or issues with the installation or condensate pump. Regular maintenance can help prevent these problems.

Why does water drop from an AC indoor unit?

Water drops from an AC indoor unit when the condensate drain line is clogged, preventing proper drainage. Additionally, dirty air filters can restrict airflow, causing the evaporator coil to freeze and then thaw, leading to water leakage. Low refrigerant levels and improper installation can also contribute to this issue. Regular maintenance helps prevent these occurrences.

Should I turn off my AC if it is leaking water?

Yes, you should turn off your AC if it is leaking water to prevent further damage to the unit and your home. Water leakage can indicate underlying issues such as a clogged drain line, dirty air filter, or low refrigerant levels. Turning off the unit and addressing the problem promptly can help avoid more significant damage.

Can we use an AC when water is leaking from an indoor unit?

It is not advisable to use your AC when water is leaking from the indoor unit. Operating the AC while it leaks can cause further damage to the unit and potentially your home. Address the issue by turning off the AC and checking for common problems like a clogged drain line or dirty filter, and consider contacting a professional for repairs.

Can I buy ACs on EMIs?

Yes, you can purchase ACs with Bajaj Finserv’s Easy EMI options.

If you are an existing user of the Bajaj Finserv Insta EMI Card:

  • Explore a wide range of ACs on Bajaj Mall

  • Choose the preferred model and visit a Bajaj Finserv partner store to check it out in person

  • Use your EMI Network Card and avail of Easy EMIs for affordable monthly payments

  • Enjoy your new AC on Easy EMIs

If you do not have one, there is no need to worry. Check your eligibility for an Insta EMI Card and take the first step towards enjoying the affordability and convenience of Easy EMIs.

How do I get moisture out of my AC indoor unit?

Moisture inside your AC indoor unit usually collects due to blocked drain pipes or dirty filters. You can reduce this by cleaning the filters every few weeks and ensuring the drain pipe is not clogged. Running the fan mode for a while after cooling can also help dry out the moisture. If the problem continues, you may need a technician to check the insulation or refrigerant levels. Regular servicing prevents moisture build-up and keeps the AC working well.

How to stop inside of an AC unit from leaking water?

To stop water leakage inside your AC unit, first check and clean the drain pipe. Remove dust from the air filter to improve airflow and reduce excess condensation. Make sure the AC is installed correctly and that the unit is level. Keep the area around the drain clear so water can flow out easily. If leakage continues, contact a professional service to inspect the evaporator coil and insulation. Timely care reduces leakage and protects your walls and floors.

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