A leaking air conditioner can disrupt cooling, raise indoor humidity, and lead to expensive repairs. Water accumulation may cause structural damage, promote mould growth, and lower air quality.
If not addressed, ongoing leaks can strain the system, reducing efficiency and increasing energy costs. Identifying the cause early prevents long-term damage and ensures the unit functions correctly.
Common Causes and Solutions of Water Leaks
1. Clogged Drain Line
The condensate drain line removes excess moisture from the unit. Over time, dust, debris, and mould can accumulate, blocking the water flow. When this happens, water backs up and leaks from the system.
Solution:
- Use a wet/dry vacuum to remove blockages
- Flush the drain line with a mix of water and vinegar to prevent buildup
- Install a drain line trap to reduce obstructions
- Have a professional inspect if the blockage persists
2. Dirty Air Filter
Air filters trap dust and particles, preventing them from entering the system. A clogged filter restricts airflow, causing the evaporator coil to freeze. When the ice melts, excess water overflows from the drain pan.
Solution:
- Replace filters every one to three months based on usage
- Clean reusable filters regularly to maintain efficiency
- Check filters more frequently during heavy usage periods
3. Damaged Drain Pan
The drain pan collects condensation and directs it to the drain line. If it is rusted, cracked, or misaligned, water can leak.
Solution:
- Inspect the drain pan for cracks, rust, or corrosion
- Replace if there are visible signs of damage
- Apply a protective coating to extend the pan’s lifespan
4. Low Refrigerant Levels
Refrigerants help cool the air. When levels are low, system pressure drops, causing the evaporator coil to freeze. As the ice melts, water may overflow the drain pan.
Solution:
- Listen for bubbling or hissing sounds indicating a refrigerant leak
- Contact a professional to check refrigerant levels
- Avoid handling refrigerant without proper certification
5. Faulty Condensate Pump
Air conditioners with condensate pumps rely on them to expel water. If the pump fails, water builds up and leaks.
Solution:
- Check if the pump is receiving power and operating correctly
- Clear any debris in the pump’s tubing
- Replace the pump if it no longer functions properly
6. Air Leaks Around the Vent
Gaps around vents allow warm air to enter, creating condensation. This moisture can accumulate and drip near the unit.
Solution:
- Inspect ducts for gaps and seal them properly
- Ensure vents are securely installed and aligned
7. Improper Installation
Improper installation can prevent water from draining properly, leading to leaks.
Solution:
- Ensure the unit has a slight tilt directing water toward the drain line
- Have a professional assess and correct improper installation
8. Poor Maintenance
Routine maintenance prevents blockages and extends the unit’s lifespan. Without maintenance, dirt, dust, and bacteria build up, leading to inefficient operation and water leaks.
Solution:
- Schedule professional servicing annually
- Clean and inspect drain lines, filters, and evaporator coils as needed
- Monitor refrigerant levels and replace worn components as needed
Additional Issues That Can Cause Water Leaks
Frozen Evaporator Coil
If an air conditioner runs continuously without enough airflow, the evaporator coil may freeze. Once it thaws, excess water can overwhelm the drain pan.
Solution:
- Ensure the air filter is clean and airflow is unrestricted
- Avoid running the system at excessively low temperatures
- Have a technician inspect for airflow restrictions
High Humidity Levels
In humid climates, excess moisture can accumulate, overloading the drainage system and causing leaks.
Solution:
- Use a dehumidifier to reduce indoor humidity
- Set the air conditioner to an appropriate temperature
- Clean the drain line more frequently in humid conditions
Preventative Measures to Avoid Water Leaks
- Clean air filters once a week to maintain airflow
- Flush the drain line periodically to prevent blockages
- Ensure the unit is correctly installed with a slight tilt for drainage
- Monitor refrigerant levels to prevent coil freezing
- Inspect and replace damaged drain pans and condensate pumps
- Schedule annual maintenance to keep the system in good condition
When to Seek Professional Help
Persistent leaks signal deeper system issues that need immediate attention. Ignoring them can cause water damage, increased energy bills, and potential system failure. A professional diagnosis ensures the problem is resolved correctly, preventing further complications and extending the lifespan of your air conditioner.
At Hogan Hot Water & Air Conditioning, we provide expert servicing to keep your system running efficiently. Call us today at 0488 029 618 to schedule an inspection and get your air conditioner back in top shape.