Leaking AC Unit? Here’s What Might Be Causing It

Air conditioning units are essential for maintaining comfort in Australian homes, especially during the scorching summer months. However, a common issue many homeowners face is a leaking AC unit. While it might seem like a minor inconvenience, a leaking AC can lead to significant problems, including water damage, mould growth, and reduced system efficiency. In this article, we’ll explore the possible causes of a leaking AC unit, why it’s essential to address the issue promptly, and how to prevent it in the future.

Signs Your AC Unit Might Be Leaking

Identifying a leak in your AC unit early can save you time and money on repairs. Here are some tell-tale signs that your air conditioner might be leaking:

  • Water Pooling Around the Unit: Puddles of water near your AC unit, either indoors or outdoors, are a clear indication of a leak.
  • Unusual Dripping Sounds: A consistent dripping noise could signal that water isn’t draining properly.
  • Reduced Cooling Efficiency: If your AC isn’t cooling as effectively as before, a leak might be causing underlying issues.
  • Musty Odours: The presence of mould or mildew caused by excess moisture can result in unpleasant smells.

Two big outdoor units of AC installed on the wall near the ground

Possible Causes of a Leaking AC Unit

Several factors can contribute to a leaking AC unit. Understanding these causes can help you diagnose and address the problem effectively.

1. Clogged Drain Line

The drain line is responsible for carrying away condensation from your AC unit. Over time, dirt, debris, and mould can build up and block the line, causing water to back up and leak out of the unit. 

Solution: Regularly clean the drain line using a wet/dry vacuum or a specialised cleaning solution. For persistent clogs, it’s best to call a professional.

2. Frozen Evaporator Coils

Evaporator coils are a critical component of your AC system, as they absorb heat from the air. When airflow is restricted, or there’s an issue with refrigerant levels, these coils can freeze. As the ice melts, it can lead to water leakage.

Solution: Check for airflow obstructions, such as dirty air filters or closed vents. If the problem persists, a technician may need to inspect the refrigerant levels.

3. Dirty or Damaged Air Filters

Dirty air filters restrict airflow, causing the evaporator coils to freeze. As the ice thaws, the excess water can overwhelm the drainage system and lead to leaks. 

Solution: Replace or clean your air filters every 1–3 months, depending on usage and environmental factors like dust or pet hair.

4. Low Refrigerant Levels

When your AC’s refrigerant levels are too low, the system struggles to maintain proper pressure, causing the coils to freeze and eventually leak water during the thawing process. 

Solution: Contact a professional to check for leaks in the refrigerant lines and refill the refrigerant if needed.

5. Improper Installation or Levelling

If your AC unit isn’t installed correctly or isn’t level, water may not drain properly from the drainage pan, leading to leaks. 

Solution: Ensure the unit is professionally installed and check that it’s level. A technician can adjust the placement if necessary.

6. Cracked or Rusted Drain Pan

Older AC units often have worn-out drain pans that can crack or rust, causing water to leak instead of being collected and drained away.

Solution: Replace the damaged drain pan with a new one to prevent further leaks.

Why You Should Address a Leaking AC Unit Quickly

A leaking AC unit is more than just a nuisance. Ignoring the problem can lead to several serious consequences:

  • Water Damage: Persistent leaks can damage walls, ceilings, and floors, resulting in costly repairs. Left unchecked, this water can seep into structural elements, weakening your home’s foundation over time. Even small leaks can lead to significant issues if they spread to hidden areas.
  • Mould Growth: Excess moisture creates the perfect environment for mould and mildew, which can negatively impact indoor air quality and cause health issues. Mould spores can trigger allergies, asthma, and other respiratory problems, making it essential to address leaks quickly to protect your family’s health.
  • Reduced Efficiency: A leaking unit often struggles to cool effectively, leading to higher energy bills. The extra strain on the system means it has to work harder to maintain your desired temperature, which not only increases costs but also shortens the lifespan of the unit.
  • Component Damage: Prolonged leaks can damage internal AC components, leading to expensive repairs or even system replacement. Moisture can corrode electrical parts, damage the compressor, or cause permanent harm to the motor. These types of damages can render your AC unit completely inoperable.
  • Increased Humidity: A leaking AC unit may fail to regulate indoor humidity effectively, leading to discomfort in your living space. High humidity can also cause wood furniture to warp, paint to peel, and electronics to malfunction. Addressing the issue promptly can save you from these potential headaches and extend the lifespan of your AC unit. It also ensures your home remains a comfortable and healthy environment for you and your family.

When to Call a Professional

While some AC leaks can be resolved with simple DIY fixes, others require professional expertise. Here’s when you should call a technician for AC servicing:

  • Refrigerant Issues: Handling refrigerant requires specialised knowledge and equipment.
  • Persistent Clogs: If you’ve cleaned the drain line but the leak persists, a professional may need to use advanced tools to remove blockages.
  • Complex Repairs: Issues like faulty components, electrical malfunctions, or installation errors should be handled by a licensed technician. To find a reliable professional in Australia, look for licensed HVAC technicians with good reviews and transparent pricing.

An outdoor unit of an AC installed on a house

Preventative Maintenance Tips

Preventing AC leaks is often easier and more cost-effective than repairing them. Here are some maintenance tips to keep your system in top shape:

  1. Regular Servicing: Schedule professional maintenance at least once a year to ensure all components are functioning properly.
  2. Clean or Replace Filters: Dirty filters are a leading cause of airflow issues. Keep them clean or replace them regularly.
  3. Inspect and Clean Drain Lines: Periodically check the drain line for clogs and clean it to prevent build-up.
  4. Ensure Proper Ventilation: Make sure there’s adequate airflow around your indoor and outdoor units.
  5. Monitor Refrigerant Levels: Have a technician check refrigerant levels during routine maintenance.
  6. Clear Debris from Outdoor Units: Keep leaves, dirt, and other debris away from the outdoor unit to ensure proper drainage and airflow.

Releated Questions

While you can technically use an AC that’s leaking water, it’s not recommended. Prolonged use may lead to more severe damage, including electrical issues, mould growth, or inefficiency, which could increase repair costs.

 

Conclusion

A leaking AC unit is a common but manageable problem. By understanding the causes and taking preventative measures, you can keep your system running efficiently and avoid costly repairs. If you notice persistent issues or are unsure about the cause of the leak, don’t hesitate to contact a professional. Regular maintenance is key to ensuring your AC unit remains reliable and effective, keeping your home cool and comfortable all year round. 

Experiencing AC leaks? Don’t wait until the problem worsens. Contact our trusted air conditioning repair today to diagnose and repair your system. Stay cool and worry-free!