Resolving Aircon Water Leaks: Causes and Solutions

Aircon leaks can be a real problem, causing damage to your home and making energy bills go up. This happens when things like blocked drain lines, dirty air filters or bad installation stop the aircon from working right.

To make it worse, when air filters get too dirty, they can freeze part of the aircon and lead to more leaking! Keeping your air conditioning system checked and cleaned by a pro is super important to prevent water from escaping where it shouldn’t.

Sometimes even pipes that have gotten old over time can cause trouble by letting water leak through. Knowing what makes an aircon drip and how you can fix it yourself or decide if you need someone’s help will save you lots of headaches.

Fixing frozen parts inside the unit is one way to tackle this issue. Stay tuned as we guide you on how to keep your cool and stop those pesky leaks for good!

Why does an Aircon Leak Water?

Airconditioning units may begin to leak water due to a range of underlying issues, with common culprits including blockages, damage or wear and tear on components. Understanding these causes is essential for both effective solutions and preventative maintenance that ensure your air conditioning system operates smoothly.

Blocked Drain Line

A blocked drain line in your air conditioning unit can cause water to leak. Dirt and debris can stop water from flowing through the pipes. When this happens, the water backs up and spills over.

Your aircon collects moisture from the air, which should flow out through these lines.

To fix a clogged drain line, you must clear out the blockage. You might use a wet/dry vacuum cleaner to suck out any dirt blocking the pipe. For regular maintenance, keep these lines clean to prevent future leaks.

This helps protect your home from water damage caused by an overflowing drainage tray.

Damaged Overflow Pan

Your aircon’s overflow pan catches any excess water that drips down. If this pan is damaged, it can lead to serious water leaks in your system. Cracks or holes in the pan let water escape instead of being safely removed.

Inspect your overflow pan regularly for any signs of damage.

Poor maintenance often causes these problems. Make sure to check and maintain your aircon as needed. If you spot any damage, replace the overflow pan quickly to prevent leaks from damaging your home or office.

It’s a simple fix that keeps your air conditioning unit working well and protects against water damage.

Dirty Air Filter

A dirty air filter can cause big problems for your air con. The filth blocks the flow of cool air over the evaporator coils. This might make the coils freeze up. When they thaw, water leaks out.

Keep your filters clean to stop this trouble. Swap or wash them every few months, and you’ll help keep your air con from leaking. Next, we will discuss “Incorrect Installation” and how it contributes to water leaks in air conditioners.

Incorrect Installation

Just like dirty air filters can cause trouble, an incorrectly installed air conditioner might not function as it should. If the unit is not set up right, air leaks may occur and water can start leaking too.

A unit must sit level so that water drains properly. If it’s tilted or has loose connections, this can mess with how water flows in the system.

A professional should check for issues like damaged drain pans due to poor installation. This problem needs fixing fast to stop leaks. Make sure whoever installs your aircon knows what they’re doing! Proper setup keeps your home cool and stops leaky problems before they begin.

Broken Pump

A condensate pump plays a vital role in an aircon system. It helps to move the condensed water to a proper drainage area. If this pump breaks, water can’t flow out and may start leaking from your aircon unit.

You might hear strange noises or see water pooling around the base of your indoor unit.

To fix a broken condensate pump, you’ll likely need professional help. Aircon technicians have the skills to replace or repair it quickly and safely. Ensure they check for blockages, electrical issues, and pump failure during their visit.

Regular aircon maintenance can reduce the risk of future breakdowns and leaks from happening again.

Leakage in The Condenser Coil

The condenser coil in your aircon can cause leaks if it gets damaged. Tiny holes or cracks let refrigerant leak out. This makes the coils get too cold and water starts to build up on them.

Then, this water can drip and create a puddle.

To stop the condenser from leaking, first look for signs of damage on the coil. If you spot any cracks or rust, it’s time to call in an expert to fix it. They might seal small leaks or replace the whole coil if needed.

Regular checks help prevent big problems later on.

Detailed Explanation of Causes

Understanding the root causes of an aircon water leak is essential for determining the correct solution. This section delves into common issues such as full drain pans, compromised components, and installation errors that could lead to inefficient operation and unwanted water drips.

Full Drain Pan

A full drain pan in your aircon often signals a clog in the condensate drain line. This can happen when dirt and debris build up over time. If water cannot flow through the line, it backs up into the pan.

This overflow leads to leaks that may damage your home or office.

To tackle this issue, first check for blockages. Regular aircon servicing is key to preventing these kinds of problems. During a service visit, technicians will clear out any gunk from your system’s pipes and ensure everything flows smoothly.

Also, addressing refrigerant levels helps stop ice formation on coils that causes extra water to fill the pan quickly. Keep maintenance on schedule to avoid overflowing drainage pans and keep your indoor air quality high without leaking issues.

Damaged or Broken Drain Pan

Your aircon’s drain pan catches condensation from the cooling process. If this pan is damaged or has cracks, water will leak out instead of being safely moved away. This can lead to puddles near your unit.

You need to check the drain pan regularly for any signs of damage. Look for rust, holes, or breaks that could cause a leak.

To fix a leaking drain pan, you might be able to use an epoxy glue as a temporary solution. However, replacing the broken pan with a new one is often the best fix. Make sure the new pan fits properly and is installed correctly to prevent future leaks.

Regular checks on your drain pan will help keep your system running smoothly without water trouble.

Dirty Aircon Filters

Dirty aircon filters are a common cause of water leaks. Over time, they gather dust and dirt which block the airflow over the evaporator coils. This can lead to frost build-up on the coils.

As the ice melts, it may overflow from the drain pan and cause a leak.

To prevent this problem, clean your aircon filters regularly. Check them monthly and wash or replace as needed. This simple step helps maintain proper airflow and stops ice from forming on your evaporator coils.

It keeps water leaks at bay, ensuring your air conditioning system runs smoothly.

Improper Installation of the Aircon

Improper installation of your air conditioner can cause big problems. If it’s not flat, the water may not drain right. The seals need to fit just right too. If they don’t, water could start leaking out.

A pro needs to check if everything is set up correctly.

Make sure the aircon is installed by someone who knows what they’re doing. Sloppy work leads to leaks because parts might not connect well. You want your system running smooth without any dripping issues.

Fixing this fast saves you from bigger headaches later on!

Leaking Refrigerant

Low levels of refrigerant in your aircon can cause big problems. Without enough refrigerant, the pressure drops and makes the evaporator coil get too cold. Once it gets too cold, ice may form on it.

After a while, this ice melts and you see water leaking from your unit.

It’s important to fix a leaky refrigerant quickly. Not only does it make your aircon less efficient, but it can also damage other parts of the system. Call an expert to handle refrigeration repair because dealing with coolant requires special skills and tools.

A professional will find the leak, seal it up, and refill the refrigerant to keep your air conditioning system running smoothly.

Malfunctioning Condensate Pump

Moving from refrigerant issues, a condensate pump can also be the culprit behind water leaks in air conditioning systems. This pump helps to remove the water that your aircon unit collects from the humid air inside your home.

If it breaks or doesn’t work right, water can start building up and might spill out of your aircon. This is more likely if you have an HVAC unit in a basement where gravity can’t help drain away the water.

To fix this, first check if there’s power to the pump. Make sure it’s clean and free of any dirt that could stop it from working. If cleaning doesn’t help, you might need a new pump.

Regular servicing by professionals should keep everything running smoothly and prevent future leaks due to a faulty condensate pump.

Leaking Condenser Coil

A leaking condenser coil is often behind water leaks in air conditioners. If not fixed, it can cause serious damage to your system. Regular servicing catches these issues early on.

A technician can spot corrosion or holes in the coil that let liquids seep out.

To fix a leaky condenser coil, you may need a professional. They will check for refrigerant leakage and repair any damage found. For some systems like split or central air conditioners, this task can be complex.

Don’t wait until your aircon breaks down; have it checked as part of yearly maintenance to prevent leaks and other problems.

Frozen Evaporator Coils

Ice on your aircon’s evaporator coils can cause water to drip and make a mess. This happens because the ice blocks normal airflow, and when it melts, the extra water overflows. High humidity levels in the room can also lead to more frost on these coils.

To fix this problem, first turn off your aircon to let the ice melt.

Clearing out dirt from the filters might help. Dirty filters stop air from moving freely which makes ice form faster. You can clean or change these filters by yourself. If there’s still trouble after you’ve cleaned everything, you might need a pro to do a chemical overhaul for better results.

They will check for any airflow blockage and sort it out so that your system works smoothly again without leaks.

Air Leakage

Air leakage in your aircon can lead to serious problems. If it’s not installed flat or the seals don’t fit right, air can escape. This makes your unit work harder and waste energy.

Holes or cracks in the ducts also cause leaks, letting cooled air slip out.

You need a professional to fix these issues with your ventilation system. They will check for gaps and seal them up properly. Sealed ducts make sure that all the cool air stays where it should be—inside your home!

Old Pipes

Old pipes in your air-conditioning system can cause trouble. They might get clogged or corrode over time. Corroded pipes can’t carry water away properly, leading to leaks. If these leaks are left unchecked, they could lead to mold growth and damage to your home.

To fix old pipe issues, regular servicing is key. An expert can spot problems early and clean the drain lines before they clog up. Sometimes replacing old sections of piping is necessary for a long-term solution.

You may also need a larger condenser pan installed by professionals to catch any excess water and avoid future spills.

Causes and Fixes for Frozen Evaporator Coils

Dirty air filters are a common reason for frozen evaporator coils in air-conditioners. Clogged filters restrict the airflow over the coil, causing it to get too cold and freeze. To fix this, change or clean your air filter every month or as recommended by your HVAC system’s manual.

This ensures proper airflow and prevents ice from forming on the coils.

If you face low refrigerant levels, it could also cause the evaporator coils to freeze. The lack of refrigerant stops the coils from absorbing heat effectively, leading them to drop in temperature and ice up.

You should call a professional technician from an air-con service company because handling refrigerants requires special training and certification. Regular servicing keeps your split system air conditioner running smoothly and can stop leaks before they start.

How to Fix a Leaking Aircon

Addressing a leaking air conditioner head-on will prevent further water damage to your home and ensure the unit operates efficiently. With the right approach and tools, you can troubleshoot and effectively rectify common issues that cause your aircon to leak water, maintaining a cool and comfortable environment in your living space.

Unplugging the air conditioner

Turn off your aircon before you start any repairs. This is a crucial safety step to avoid electric shocks. Pull the plug from the socket or switch off the circuit breaker that powers your unit.

Wait for a few minutes after disconnecting electricity. Letting your air conditioner rest ensures all stored energy dissipates. This makes it safe for you to open up and inspect different parts like filters, coils, and drain pans without risk.

Removing the back of the outdoor unit

To remove the back of the outdoor unit, first shut off the power to your air conditioner. This keeps you safe while working on it. Then, locate all the screws that hold the back panel in place.

Use a screwdriver to take out these screws carefully.

Cleaning the inside compartment

Turn off your aircon before you start cleaning the inside compartment. This is for safety and to prevent damage. Carefully take out the front panel and filters. You might see dust, debris, or even ice if the evaporator coils have frozen over.

Use a soft brush to gently clean all parts of the air-handler that are easy to reach. Make sure you clear any dirt from the cooling fins without bending them.

Look for signs of water in the overflow pan; this could mean there’s a blockage somewhere else. Clear away any debris in this area as well. If dirt has collected on your air filters, it’s probably restricting airflow and causing ice buildup on your evaporator coils – remember, when these melt they can cause leaks! Wash or replace your air filters regularly to keep everything running smoothly and avoid water trouble with your mini-split or reverse cycle air conditioner unit.

Performing the test

Check the aircon is working after you clean it. Plug in the unit and switch it on. Look for water leaks while it runs. If there are no leaks, you did well fixing your air conditioner.

Now, put all parts back where they belong carefully. Make sure every piece fits right to avoid future issues with your aircon system.

Use a bucket or another container to catch any drips during testing if you’re not sure about your fix yet. This will protect floors and furniture from water damage as you check if repairs hold up when the unit is running again.

Keep an eye out for steady water flow that might mean a leak in places like drain lines or overflow pans which need more attention.

Attaching the aircon parts in their former position

Make sure each part of the aircon is dry before you put it back. Fit everything carefully into its original place. Tighten all screws and secure connections. Reconnect any wires or hoses you detached.

Slide the air handler back against the wall if you moved it. Place the cover on tightly so no air leaks out. If your unit is in the attic, be careful not to disturb other equipment around it like ducts or compressors.

Remember, regular maintenance helps avoid these issues in the future.

Professional Vs DIY Solutions

Determining whether to tackle an aircon leak on your own or seek professional help hinges on the complexity of the issue and one’s confidence in their DIY skills. While some may find a certain level of satisfaction in resolving minor problems independently, intricate or persistent leaks typically call for the expertise and equipment that only a seasoned technician can provide.

Fixing A Leaking Aircon Yourself

Turn off your air conditioner before starting any repair work. This is a safety must. Check the drain pan and pipe for blockages or damage, which might cause water leaks. Clean or replace them as needed to stop the water from overflowing.

Look at your air filters next. If they’re dirty, they can block airflow and freeze the evaporator coil, leading to leaks when it melts. Clean or swap out these filters regularly to prevent this issue.

Ensure all inside parts are dry and clean before putting everything back together. Test your aircon after reassembly by turning it on and checking for leaks again. With care and attention, you can often fix simple issues without calling a professional.

Hiring A Professional Aircon Service Company

Fixing a leaking aircon can be tough and sometimes risky. This is where hiring a professional aircon service company comes in handy. Experts have the right tools and knowledge to diagnose and fix leaks quickly.

They ensure your unit runs efficiently, saving you from future headaches. Regular servicing by qualified technicians like those at DW Aircon Servicing Singapore also prevents leaks before they start.

Trust professionals to handle complex tasks like fixing old pipes or sealing leaky condenser coils. They will make sure your air conditioner stays in top shape all year round.

Choose a reliable aircon service for peace of mind. A professional team checks not just the leaks but the entire system including the radiator, air ducts, and other components too.

Quick fixes might seem cheaper now, but expert services save money over time by avoiding bigger issues later on. Investing in skilled care means enjoying cool comfort without unexpected disruptions from water leaks or other malfunctions.

How to Prevent Your Aircon From Leaking

Maintaining a leak-free air conditioning system hinges on proactive measures and timely upkeep. Implementing routine checks and swift action at the first sign of trouble can help safeguard your unit against water leakage issues, ensuring its efficiency and longevity.

Regular Cleaning of Your Aircon

Keep your aircon in top shape with regular cleaning. Dust and debris block important parts like the filter, leading to problems such as water leaks. Clean filters ensure good airflow, preventing the evaporator coil from freezing over.

A frozen coil can melt and cause leaking water. To stop this, take out the filter every month and wash it gently with warm water.

Servicing your aircon also stops leaks before they start. Have a professional inspect your unit yearly. They’ll check for issues like blocked drain lines or old pipes that often lead to spills.

Billy Aircon suggests routine checks will save you money on repairs and electricity bills in the long run by keeping your system efficient and leak-free.

Yearly Aircon Maintenance

To stop your aircon from leaking, have it checked every year. A professional will clean and inspect the whole system. They’ll look for damage or wear and make sure everything is working right.

Yearly service stops small problems from getting big and costly.

They can replace parts like filters and check the refrigerant levels too. This keeps your air conditioner running smoothly and helps prevent leaks before they start. Think about setting up a regular maintenance plan to take care of your AC unit without hassle.

Now let’s explore some common questions you might have about aircon water leaks.

Quick Resolution of Any Issues

After setting up yearly maintenance, you can tackle problems fast if they pop up. Act quickly and fix leaks right away to stop bigger issues. Check your aircon often for warning signs like water puddles or odd noises.

If you spot something unusual, don’t wait; investigate immediately. Regular checks let you find leaks early before they get worse.

Clean filters and clear drain lines help prevent most water leak problems. Replace old pipes as soon as they show wear and tear. Tighten any loose connections that might cause leaks.

By handling these tasks promptly, you can keep your aircon running smoothly all year round.

Common FAQs About a Leaking Aircon

Discover the answers to your most pressing questions about aircon leaks and gain peace of mind by understanding the causes, implications, and solutions to this common issue—continue reading for expert insights.

Is it normal for my aircon to be leaking water?

Your air conditioner might leak a little water outside on hot or humid days. This is normal because it’s removing moisture from the air inside your home. However, if you see a lot of water leaking inside your house, this could be a sign of trouble.

It means there’s likely a problem with the system that needs fixing. Check the drain pan for damage and replace it if needed.

Can I still use my aircon while it’s leaking? Let’s find out next.

Can I still use my aircon while it’s leaking?

Using your aircon while it’s leaking is not advised. Leaks can damage your home and lead to bigger issues with your unit. If you notice water dripping, it’s likely due to a serious problem, like a clogged drain line or frozen evaporator coils which means airflow may be blocked.

The moisture could also come from old pipes that have worn out over time.

The smart move is to turn off the aircon as soon as you spot a leak. This prevents water damage and stops the issue from getting worse. Have a professional check for flat installation problems or faulty seals if improper setup is suspected.

Don’t ignore leaks; they often grow into costly repairs if left untreated and can harm the system’s efficiency in the long run.

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

Turn off your AC immediately if you notice it’s leaking water. This is important to prevent further damage to the system and avoid safety risks, like electrical issues. Leaking water can mean there’s a problem inside, such as a clogged drain line or a dirty air filter that needs attention.

Shutting down your air conditioner stops the flow of water and gives you time to identify what’s wrong. You might find that ice has formed on the coils due to poor airflow from a dirty filter, which melts and leaks when the unit is turned off.

To fix this, clean or replace your filters regularly for smooth operation. If problems persist after these steps, call professional help for proper maintenance and repair.

Do aircon compressors leak water?

Moving from concerns about whether to turn off a leaking air conditioning, there’s another question that often comes up: do air conditioners compressors leak water? In fact, it’s not common for air conditioners compressors themselves to leak water.

They are designed to handle refrigerant, not water. However, issues around the compressor can lead to water leakage.

For example, if the air filter is dirty, this causes the evaporator coil to freeze over. When that ice melts, it may seem like the compressor is leaking water. Also, when drain lines get clogged or there’s a backflow in the drainage tray nearby, you might find water pooling around the compressor area.

An air leak near cooling coils creates moisture condensation which could drip down into areas close to the compressor unit too.

Lastly, low refrigerant levels mean your system isn’t cooling properly and this can result in excess condensation and apparent leaks around the compressor unit as well. It’s key to identify where exactly your AC is leaking from so you can target and fix the real problem directly.

Why does my AC leak after a service?

Your AC might leak water after a service for several reasons. Technicians may have accidentally blocked the drain line while cleaning. This blockage stops water from flowing out, causing it to back up and leak.

They might have also disturbed the overflow pan or not sealed it properly. A little mistake here can lead to big leaks.

Another reason could be an error during the service leaving parts loose or incorrectly fitted. For example, if your air filter isn’t put back right, it can restrict airflow and cause ice to form on coils that later melts into leaks.

Always check that everything is tight and in place after any maintenance work on your AC system. Regular servicing is key to avoiding these issues but make sure you choose a reliable technician who will do a thorough job without making mistakes.


Taking care of your aircon stops leaks and saves money. If water drips, check filters and drain lines first. Remember, a well-installed aircon won’t leak as much. Call an expert when DIY doesn’t fix the drip.

Follow these tips to keep cool without the puddles.


1. What causes water to leak from my aircon?

A blocked drain pipe or faulty condensate pump can cause water leakage from your aircon.

2. How do I stop my aircon from leaking water?

Regularly clean the filters and drain lines, and ensure the unit is level to stop your aircon from leaking water.

3. Can a water leak in my aircon damage my home?

Yes, if not fixed promptly, a water leak can lead to mould growth and damage your property.

4. Should I turn off my aircon if it’s leaking water?

Turn off your unit immediately if you notice it’s leaking water to prevent further issues.

5. Who should I call if I can’t fix an aircon water leak myself?

Contact a licensed HVAC technician if you’re unable to fix an air conditioner’s water leak on your own.

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