LG air conditioner E3 code: no refrigerant detected (window and portable)

On LG window and portable air conditioners, LG says E3 means the unit has detected that it has no refrigerant. A sealed-system leak is the usual cause, and refrigerant must be added through a repair service.

Likely causes

Listed from most to least common.

1. Refrigerant leak in the sealed system
2. Damage from dropping or tipping the unit
3. Sensor or board fault giving a false reading

How to fix the E3 code

Unplug the air conditioner or switch it off at the breaker before removing any panel or filter.

1. 1

   Step 1: Unplug and restart once

   Unplug the unit for 2 minutes, plug it back in and run Cool. Feel the air from the vents after 10 minutes.

2. 2

   Step 2: Let it settle if it was moved

   If the unit was just carried or laid on its side, leave it upright and off for a few hours before running it again.

3. 3

   Step 3: Stop using it if E3 returns

   Turn it off. Running a unit with no refrigerant can damage the compressor.

When to call a technician

E3 needs a repair service to find the leak and recharge the unit. Never try to add refrigerant yourself.

A typical repair for this code costs $200–$500 in the US, including parts and labor. Prices vary by area and model.

Models this applies to

• Ductless mini-splits (wall-mounted and Art Cool)
• Multi-zone mini-split systems
• Window air conditioners
• Portable air conditioners

Codes can differ slightly between models. Your owner's manual is the final word and is available from LG support.

Common questions