LG Air Conditioner Water Full [Problem Solved]

Do you have an LG air conditioner water full problem? It does not necessarily mean there is a big problem, but emptying the air conditioner as quickly as possible is crucial.

LG Air Conditioner Water Full Error – Quick Fix

When you see the E5 error on your LG air conditioner, whether it is a window, wall, or portable unit, it means there is water stored to overflow in the unit. The first step is to empty the unit of the water. Open the unit’s drain cap and allow the water to flow out until none is left. 

Ensure you position the air conditioner close to a drain hole or connect a hose to channel the water out of the house or into a container. If necessary, slightly tilt the air conditioner so that all the water drains completely. Then, replace the drain cap.

LG Air Conditioner Keeps Saying Water Full – How to Fix

If you find that your LG air conditioner keeps saying that the water is full, there are a few things to consider as possible causes. But first, you must empty the unit of the stored water before checking the potential sources of the problem. 

Put a pan under the drain port to collect the water when you open the drain cap. Another option is to use a hose to channel the water out. Next, open the drain cap at the bottom back of the air conditioner and allow the water to flow out until everything drains out. Dry the port before replacing the cap. Afterward, run the air conditioner and use the Dry mode of operation if available.

High humidity causes the air conditioner to fill with water too quickly, and it is a primary reason you will find your unit always indicating that the water is full. Other possible causes are a dirty filter and an obstructed condensate drain line, and you will notice this more in portable air conditioners. The LG Support Center is always available to render service and answer your questions.

LG Portable Air Conditioner Keeps Saying, Water Full

If you always have to empty the water collection tank of your LG portable air conditioner, it is a sign that the humidity is high. Not only will it throw up an error, but it will also cause the unit to stop cooling as it should.

You can run the portable unit in the Dry operation mode to act as a dehumidifier or purchase a dehumidifier for that purpose. It will reduce the moisture in the air, consequently reducing the number of times you have to empty the tank.

If the portable air conditioner is not draining water, it may be that the drain line is obstructed by dirt. It is even worse when there is high humidity; the water will only flow out of the unit in trickles. So, if you notice the ‘water full’ error and the humidity is not exceptionally high, check the drain line. A shop vacuum will suck the blockage out, or you can water and vinegar or bleach to clear the line.

One of the primary causes of a clogged drain line is a dirty air filter. Typically, you should remove the air filter and clean it every two weeks unless you do not frequently use the air conditioner or live in an area with particularly clean air. Otherwise, the dirt will distribute to different components, including the evaporator coil, blower, and drain pan, clogging it.

If your air conditioner has an installed condensate pump, it may be faulty. Condensate pumps have the job of collecting condensate from the air conditioning unit. That way, the unit does not have a water error. However, a faulty pump cannot function. Hire a certified HVAC repair technician to check the pump and clear the hose if it is obstructed.

In addition, the error may stem from the fact that you are using the air conditioner for the first time in your home. If it is a new installation, you will notice the water tank filling too quickly because the unit is absorbing the moisture in the air, on the floor, and everywhere else. It is just a way of reducing the high humidity in your home, and after a few uses, the humidity level will drop, and you will not get the error again.

How to Remove Water from a Portable Air Conditioner

If you must manually empty the water collection tank in your LG portable air conditioner, you will need a pan to collect the water and a drain hose. The hose may not be necessary in some cases, especially if you have a floor drain. 

In this article, we extensively discuss the steps to remove water from a portable air conditioner, but remember to turn the unit off and disconnect it from electric power before you begin.

Check out these other articles…

LG Air Conditioner Not Working [Problems Solved]

LG Air Conditioner Tripping Breaker [Quick Fix]

LG Air Conditioner Not Heating/Heating [Issues & Solutions]

LG Air Conditioner Beeps [How to Fix]

LG Air Conditioner Filter [How to, Issues & Solutions]

LG Air Conditioner Thermostat Not Working [Solution]

LG Air Conditioner Shutting Off [Problems Solved]

Why Do Portable Air Conditioners Need Water?

Not all portable air conditioners need water. Most models use an exhaust hose, which means they can evaporate the water in the tank. Using the Dry operation mode, they absorb moisture from the air, collect it in a tank, and eventually drain it out. The only water you will find inside such units is the one they absorb from humid air.

However, there are ventless air conditioners that require water to operate. These units work by drawing the water up through a fan system and blowing it out into the room as mist. That way, the room cools. They can also work without water, but they cannot efficiently cool the room as when they use water.


Clear the water in your LG air conditioner if you get an error message signifying the tank is full. Too much water in the air conditioner will affect components and reduce the functional capacity of the unit.

It is crucial to service the unit regularly. That way, you will know when the condensate drain line is clogged, or the air filter is significantly dirty so that you can fix them. An LG air conditioner water problem can be avoided if a service technician runs checks every month.

Leave a Comment