Why do Air Conditioners Leak or Drip Water and How to Check it out

Why Regular Aircon Servicing is Important for Residences in Singapore?
5 Main Reasons Why your Aircon doesn’t Cool your House

Do You Have Leaking Aircon Problem? Or Want to Know Why Aircon Leak Water?

Based on out 25 years of experience, you need to take immediate action when you notice there is water leaking from your air conditioner.

If you do not take the appropriate action at this point, you could find yourself with a broken air conditioner in the heart of hot weather.

There are many common reasons why your air conditioner might be leaking water and you need to know what they are. You should also know what steps you should take based on these common causes.

Quick Overview

In general, here are the 6 common reasons:

  1. Your AC drain line is clogged
  2. The AC’s overflow pan is damaged
  3. A dirty aircon filter
  4. Inproper Installation
  5. A Broken Pump
  6. You AC condenser coil is leaking

Ok. What’s next? Should you check yourself or contact a professional?

The first thing you can do is clean your aircon filter.

Then, let it run for one hour to verify if the problem is solved.

If the leaking doesn’t stop, contact us to get FREE consultation.

Billy Aircon Office

Billy Aircon offers air-conditioning servicing & repair at an affordable price with 25 years of experience. Here are the reasons why customers like us.

  • No Middleman’s Cut
  • Fully-Licensed Aircon Service Company
  • Over 25 Years of Experience
  • 90 Days Workmanship Warranty
I owe this guys a review. They know what they are doing. One of my blowers were not cold (due to too much gas) and they diagnose it nicely. Finally, I did 5 x chemical washes (3 x blowers and 2 x compressors) which I had not done for over 3 years. Now they are humming like new. I will definitely call them back in June/July for yearly contract.read more
Mun Wai Chiang
Mun Wai Chiang
06:51 18 May 18
Excellent response time! I sent my enquiry at 9am in the morning and they were able to schedule a midday servicing for me. The technician was very professional and accurately identified and rectified the problems with my air conditioning.Highly recommended! 👍read more
Raymond Lee
Raymond Lee
07:00 30 May 18
Thanks! I thought the unusually high heat coming out of my AC was going to burn my house eventually. It was actually a big clogging problem. They penciled me in for a full Aircon chemical cleaning. Ah hao sent proceeded with his work and I was even more impressed with how they did it with all the safety procedures and everything.read more
Pasquale Crona
Pasquale Crona
10:48 18 Apr 18
The customer service of Billy Aircon is outstanding. Their staff was really friendly and gave me the right information to book their service.read more
Lee Kins
Lee Kins
14:57 25 May 18
Had a hard time booking an appointment for aircon service the whole week because I wasn't' able to get off work. Heard about this new online service from a friend. I tried Billy Aircon and I got a quick response. I was scheduled for the weekend because that was what I preferred because I was at home. Sure enough, they were there ready to do their work. Happy I found a convenient option. For a busy guy, like me, that's gold!read more
Earl Pollard
Earl Pollard
16:09 26 Jun 18
Choosing Billy Aircon in Singapore was the best decision I ever made! Friendly staff and even better aircon service and repair. No regrets!read more
Brendon Gleichner
Brendon Gleichner
21:20 10 Jul 18
Very helpful. Able to attend our immediate request on Sunday afternoon. Daniel helped us to diagnose the cause of error is due to thermostats and able to give us advices. Excellent services.read more
Weng Koon Wong
Weng Koon Wong
09:37 12 Aug 18
I thought that it would be hard to find an aircon service. Singapore had a lot of scammers they said. Well... I found the perfect company that addressed the repair needs of my air-conditioner. I was not disappointed with their services.read more
Jaron Hagenes
Jaron Hagenes
09:21 17 Aug 18
I needed aircon installation for our new air-conditioner at home. But, I am new here and don’t have any contact. After googling some time, I hired Billy aircon. I was very impressed on how efficient they were, and you could clearly see they knew what they were doing. My new air-conditioning system is running smoothly, and I didn't even have to break a sweat. Thanks!read more
Julius Schiller
Julius Schiller
21:26 25 Aug 18
I rely on this company all the time for my aircon cleaning service. They even have professional aircon installation which is great for households with new air-conditioners. If your AC is experiencing problems, give them a call. You will not be disappointed.read more
Rolando Stroman
Rolando Stroman
14:46 09 Sep 18
Mok from Billy Aircon did a very good job, he explained the details and chemical overhauled my blowers to brand new condition, he even make sure the gas is at the optimum pressure as well as the wind blown out is at the coolest condition.My Panasonic blowers are now running like new. , well done Billyaircon. Please keep up the good work.read more
Wish Vv
Wish Vv
04:31 06 Oct 18
Very friendly,The price is very reasonablegood service!!! Thank you for solving my aircon problem😊😊😊read more
Chirs Gan
Chirs Gan
10:27 09 Dec 18
Great service whatsapp response fast and their service crew very efficient and professional. Will definitely use their services again.read more
Jeremy Tan
Jeremy Tan
09:14 27 Dec 18
A truly professional aircon service company. They came in with expert knowledge and they left their make-shift repair area at home clean as a whistle. I was very happy with their service.read more
Zi Ling Lim
Zi Ling Lim
12:51 03 Jan 19
One of the most professional service providers I've encountered as an expat here in Singapore . Hats off to the team!
Sekandor Jeni
Sekandor Jeni
13:11 03 Jan 19
It was a bit hard to locate our home, but the team really took an effort to let us know they were on their way. Our aircons are now cooling off the place impressively.read more
Rs kumaran
Rs kumaran
09:27 11 Jan 19
They use modern equipment when fixing your air-conditioner. It was a job well done.
YK Choi
YK Choi
14:23 15 Jan 19
I got professioanal service from the Billy Aircon Company. They got in as scheduled and fixed it quickly enough to not be a hassle. Happy customer here!read more
Benita L.
Benita L.
02:53 16 Jan 19
Our home is found at the end of Singapore which made it difficult to find a service company that were willing to go here. Good thing we found Billy Aircon online. We now have AC's running smoothly again.read more
usha nantheni
usha nantheni
13:48 15 Jan 19
The specialist here are one of the most knowledgeable staff I encountered. I had lots of questions about our office aircon system and they were able to really help us out, in the midst of conducting the regular cleaning stuff.read more
nisha dharan remix
nisha dharan remix
04:01 19 Jan 19
Punctual efficient n patience. Can wait to confirm air cond.run normally. I will continue to use his services in the future n share with others too. Thank u.read more
Ng Robett
Ng Robett
10:02 25 Jan 19
Happy with Billy Aircon Services, as usual. Their aircon specialists are really courteous and also care to explain what’s going on with our unit. We will book with them next time!read more
Dylan Christy
Dylan Christy
08:28 31 Jan 19
Great help for us in deciding what aircon to install! I also like that they have warranty for their services. Trustworthy company!read more
08:25 31 Jan 19
Fast response! Last minute booking and manage to get a timeslot in Saturday after negotiating with Chris. Thumbs up!
Tan J
Tan J
11:13 11 Feb 19
One of the Billy Aircon's Repairman have some sort of trouble with me. The company then offer me free charge for better service tomorrow. At least the company is honest and try to repair one of their mistakes to satisfy me as a customer.read more
Phil Pilgrim Scotish
Phil Pilgrim Scotish
10:25 16 May 18

Now let’s dive in more about aircon leaking here…

1. A Clogged Drain Line

The most common reason for air conditioners to leak water is a clogged drain line.

As the name suggests, the drain line is the pipe that links the overflow pan to the outside or the drainpipe depending on the setup of your air conditioner.

There are a few reasons why this line might become clogged and a few things that you can do to remedy this.

The first step that you need to take is to look at where the water is coming from.

  • If the water leak is from the front of your unit, it is possible that the unit was not installed correctly.This is a problem that many people face with window air conditioners which tilt to the front when they are installed incorrectly. In these cases, the unit will need to be taken out and installed correctly to stop the leak.
  • If the water is not coming from the front, you should check the tubing leading from the unit for any debris and dirt. If you feel any resistance in the tubes, you should clear the blockage so the water can move freely.It is important to note that many modern units will have an emergency shutoff feature which will protect the device when there is a clog in the drain line.
  • If your unit has suddenly turned off for no reason, you should look at the drain line.

2. The Overflow Pan Is Damaged

While you are checking the drain line, you should also look at the overflow pan in your unit.


This pan is located underneath the unit and could be the cause of your water leaks.

When this pan is damaged, the water will spill out onto the floor.

When inspecting the pan, you should look at each corner carefully. You should also look along the edges for any holes, cracks or notches. Any of these issues will allow water to flow from the pan to your floor.

Small holes in the pan can be easily fixed with epoxy, but you might want to replace the entire pan for the best and longest lasting results.

3. The Air Filter Is Dirty

There are many people who do not realise that a dirty air filter can cause a water leak.

The air filter in your air conditioner will need to be changed regularly and leaving a filter for too long will impede the air flow in the unit.

When this happens, the air around the evaporator coils will become too cold and this will cause the coils to freeze over.

When the coils freeze, ice will form inside the unit. The heat from the outside air will then cause the ice to melt and this will lead to a leak.

It is important to note that a dirty air filter is not the only reason why your coils might freeze, but it is the most common.

Air conditioner filters will generally last 1 to 2 months before they should be replaced.

When you have a water leak, you should check your filters and see if they are dirty.

You should also consider when the last time they were changed was and replace them if you are unsure about this. Changing your filter could prevent a lot of problems with your unit that you will want to avoid.

4. Incorrect Installation

If your air conditioner is new, the drain lines and filters will generally not be the cause of the water leak. Incorrect installation could be to blame for your sudden water problem.

There are a number of points that you should consider regarding the installation that could cause water to leak from the unit.

The first point that you need to look at is whether or not the air conditioner is on a flat surface.

When the unit is not level, the water in the overflow pan will leak and the drain line will not work correctly. If the unit is not level, you should look at adjusting it or getting the person who installed it to adjust it.

If you have a window air conditioner, you should consider if the seals that secure the unit to the window are loose.

When the seals are not done correctly, the warm air from outside will meet the cold air from the condenser. This will cause condensation and will eventually cause a water leak.

If you are handy enough, you will be able to fix these seals yourself or you will need to contact the installer.

5. A Broken Pump

When your air conditioner has a broken pump, the water from the overflow pan will not be drawn into the drain line. This will cause the pan to overflow and the excess water to leak onto the floor.

You will only be able to determine if this is the problem after you have determined that the drain line is clear of any blockages.

To test if you have a broken pump, you will need to pour some water into the overflow pan.

If the water does not drain, the pump could be the cause. If you have a broken pump, you will need to call a professional to assess the pump and replace it.

When you have water leaking from your air conditioner, there are a number of causes that you need to investigate.

The most common cause will be a blocked drain line or a dirty filter. These problems can be dealt with easily, but if the pump is broken you will have to call a professional.

6. Leakage in The Condenser Coil

The condenser unit of your air conditioner is usually located outside of your house.

The unit comprises of a blower fan, the compressor, and the condenser coil.

This outdoor unit is more likely than the indoor unit to accumulate dust, dirt, and grime, and may even get damaged due to any outside particle getting stuck inside the condenser.

Any leakage in the condenser coil and aircon pipe are also common.

If you notice any leaks in the condenser coil, pipe leaking or leaking water in front part, you should immediately seek professional help for aircon servicing in Singapore.

However, some leaks could be hidden or too minor to provide any visual sign.

If you suspect any leakage in the condenser coil, you can perform a simple test at home to be sure about whether the coil is leaking.

5 Steps to Take to Determine if the Aircon Condenser Coil is Leaking

Ideally, you should clean your air conditioner blower and condenser coil every few months and check for any leakage in it as well.

If you notice any severe damage in the coil, you should get it replaced by professionals.

However, before you contact professional aircon service, you can take the following steps to determine if the coil is leaking.

A. Unplug the air conditioner

The first thing to do is to turn off the Aircon and unplug it. You may need to turn off the circuit breaker or fuse controlling the power supply to the Aircon.

B. Remove the back of the outdoor unit

You need to use a screwdriver to take the screws off from the back of condenser unit located outside of your home.

Now pull off the back vent, so that you can view the inside of the unit.

C. Clean the inside compartment

The next step is to clean the inside of the aircon unit with a brush.

If you want to clean hard-to-reach parts of the aircon, you should use a blower or a vacuum cleaner.

Once you clean the outdoor unit inside out, you should be able to see through the condenser coil connected to blower assembly.

In general, you’ll find the blower assembly the edges of the outdoor unit.

You can use a flashlight to check for any leakage in the condenser coils.

D. Perform the test

Now you need to roll a dry tissue paper and run it through the condenser coils.

After some time, pull the paper out and check it for any traces of liquid.

If you notice that the dry paper has soaked in any liquid, you can consider this a clear sign of leakage from your condenser coil.

E. Attach the aircon parts in their former position

Reattach the back vent with screws.

You will need to use the screwdriver again for the job. Keep the Aircon unplugged till an expert technician comes and checks it.Call  9456 0875 if you need our help

It is always a good idea to call expert Aircon technicians for repair a leaking aircon.

Make sure you do a proper background check before choosing an air conditioner repair service provider for the job who are familiar with the type of aircon you have. The common aircon brand is Mitsubishi and Panasonic.

Find out this video to learn more about how to fix leaking aircon.

Aircon Leaking Inspection
User Rating
4 based on 15 votes
Service Type
Aircon Leaking Inspection
Provider Name
Billy Aircon,
Billy aircon has over 25 years of experience in aircon servicing & repairing. We have professional team ready to help you do the thorough aircon leaks inspection and fix any leaking problem immediately. All works come with 90 days workmanship warranty.

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