How To Fix Air Conditioner Leaking Water Outside? A Step By Step Guide

Having an air conditioner that leaks water outside can be a frustrating and concerning problem. Not only does it create a mess, but it may also indicate an underlying issue with your AC unit. Fortunately, there are several common causes for this problem, and most of them can be resolved with a few simple steps.

I also faced the same issue when I got me new AC. It was dipping water outside my room and all my wall was getting wet. I did not know what to do in that case. Then, one of my friends guided me due to which I was able to get rid of the situation.

In this article, we will explore the reasons behind air conditioner leakage and provide you with practical solutions to fix it. By following these steps, you can restore your AC’s functionality and ensure a comfortable and dry environment in your home.

Causes of Air Conditioner Leaking Water Outside:

1. Clogged or Disconnected Drain Line 

  • A clogged drain line is a common culprit for air conditioner water leakage. The drain line carries the condensation away from the unit. If it becomes clogged with debris or algae, the water can back up and overflow.
  • Solution: Locate the drain line and carefully remove any clogs or blockages. You can use a wet/dry vacuum or a wire to clear the line. Additionally, consider adding an algaecide tablet to the drain pan to prevent future clogs.

2. Dirty Air Filter

  • A dirty air filter restricts the airflow and causes the evaporator coil to freeze. Once the coil thaws, excess water may overflow and leak outside.
  • Solution: Check and replace the air filter regularly, ideally every one to three months or as recommended by the manufacturer. This simple maintenance task can prevent multiple AC issues, including water leakage.

3. Improperly Installed Condensate Pump

  • If your air conditioner has a condensate pump, improper installation can lead to water leakage. The pump is responsible for pumping the condensation out of the unit, but if it is not level or has a faulty float switch, it can cause water to accumulate and leak.
  • Solution: Check the condensate pump’s position and ensure it is level. Verify that the float switch is working correctly and replace it if necessary. Hiring a professional for installation or repairs may be advisable for this component.

4. Low Refrigerant Levels 

  • Low refrigerant levels can cause the evaporator coil to become too cold, leading to condensation that exceeds the drainage capacity. This excess water may leak outside the unit.
  • Solution: If you suspect low refrigerant levels, it is essential to contact a qualified HVAC technician to inspect and recharge the system. Refrigerant handling requires specialized knowledge and equipment.

5. Damaged or Disconnected Drain Pan

  • A cracked or disconnected drain pan can cause water to leak from your air conditioner. The drain pan collects the condensation and channels it towards the drain line. If the pan is damaged or not properly aligned, water can escape.
  • Solution: Inspect the drain pan for any cracks or misalignments. If necessary, replace the pan or ensure it is properly positioned to collect the condensation.

6. Make Sure the Appliance is Installed Properly

This heading refers to the importance of ensuring that your air conditioner unit is correctly installed. Improper installation can lead to various issues, including water leakage.

It involves checking if the unit is securely mounted, the electrical connections are properly made, and the unit is level. If the installation is faulty, it can affect the unit’s performance and cause water to leak outside.

7. Check the Pipe Connections

This heading emphasizes the need to inspect the pipe connections of your air conditioner. The pipe connections are crucial for the proper functioning of the unit and for preventing water leakage.

The two main pipes to check are the refrigerant line and the drain line. Ensure that the refrigerant line is securely connected and free from any leaks or damage. Similarly, examine the drain line to make sure it is properly connected and not clogged, as clogs can cause water to overflow and leak outside.


Q1: Can I fix the air conditioner leakage myself?

  • A1: Depending on the cause of the leakage, some issues can be resolved by homeowners. However, if you are unsure or uncomfortable with the process, it is recommended to seek professional assistance to avoid causing further damage.

Q2: How often should I check and replace the air filter?

  • A2: It is generally recommended to check and replace the air filter every one to three months or according to the manufacturer’s instructions. However, in environments with more dust or allergens, more frequent replacements may be necessary.

Q3: Is it normal for an air conditioner to produce some water?

  • A3: Yes, it is normal for air conditioners to produce condensation as they cool the air. However, excessive water leakage indicates a problem that requires attention.

Q4: Why is water leaking from my air conditioner outside?

  • A4: Water leakage from an air conditioner outside can be caused by various factors, including a clogged drain line, dirty air filter, improper installation, low refrigerant levels, or a damaged drain pan. Identifying the specific cause will help you determine the appropriate solution.

Q5: How can I tell if the drain line is clogged?

  • A5: A clogged drain line can be identified by water overflowing from the drain pan or pooling around the air conditioner unit outside. You may also notice reduced cooling efficiency or water stains near the indoor unit.

Q6: Can I unclog the drain line myself?

  • A6: Yes, you can attempt to unclog the drain line yourself. Start by locating the drain line and removing any visible debris or blockages. You can use a wet/dry vacuum or a thin wire to clear the line. However, if you are uncertain or unable to do it safely, it is advisable to seek professional assistance.

Q7: How often should I clean or replace the air filter?

  • A7: The frequency of air filter cleaning or replacement depends on several factors, such as the type of filter, the environment, and usage. As a general guideline, it is recommended to clean or replace the air filter every one to three months. However, if you have pets, or allergies, or live in a dusty environment, more frequent maintenance may be necessary.

Q8: Can low refrigerant levels cause water leakage outside?

  • A8: Yes, low refrigerant levels can contribute to water leakage outside. When refrigerant levels are insufficient, the evaporator coil may become too cold, causing excessive condensation that overwhelms the drainage system. If you suspect low refrigerant levels, it’s best to contact a qualified HVAC technician to assess and recharge the system.

Q9: What should I do if the air conditioner continues to leak water outside after attempting troubleshooting steps?

  • A9: If the air conditioner continues to leak water outside after performing troubleshooting steps, it is recommended to consult a professional HVAC technician. They have the expertise to diagnose and address complex issues that may require specialized knowledge or equipment.

Also read: How To Fix Water Leak From Air Conditioner – DIY Guide


If you notice water leaking from your air conditioner outside, it’s crucial to take action promptly to prevent further damage. By following the solutions provided in this guide, you can address common causes of air conditioner leakage and restore the functionality of your unit.

Remember to perform regular maintenance tasks, such as replacing air filters and clearing drain lines, to prevent future issues. If you encounter complex problems or feel uncertain, do not hesitate to consult a professional HVAC technician for assistance.

Taking care of your air conditioner will ensure a cool and comfortable environment while prolonging its lifespan.

Talha Hanjra

Hi! I'm Talha Hanjra. I have a natural affinity for cutting-edge technological devices, and I enjoy finding solutions to their difficulties. I'll tell you how to fix various outdated gadgets and where to buy the best products. My research and experience will be of tremendous use to you.

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