Troubleshooting error code 02 on an LG air conditioner

Is your LG air conditioner displaying error code 02? Don’t worry, this is a problem that you can fix yourself without the need for a costly service call, and we’re here to help!

If you find out that you need any replacement parts for your appliance while you’re troubleshooting, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

The troubleshooting information provided in this article may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.

What the error code means

Error code 02 on an LG multi split air conditioner indicates a problem with the indoor unit coil inlet thermistor. The coil inlet thermistor is a temperature sensor that monitors the temperature of the refrigerant entering the indoor unit’s heat exchanger coil.

The purpose of this thermistor is to provide the air conditioner’s control system with information about the temperature of the refrigerant entering the coil. This data is used by the control system to regulate the operation of the compressor, expansion valve, and other parts to maintain the desired temperature and humidity levels in the conditioned space.

When the control system detects that the resistance of the coil inlet thermistor is outside of the expected range, it triggers the error code 02 to alert the user that there is a problem with this part. This could be due to the thermistor being faulty or disconnected..

Safety precautions

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind: 

• Always power off and unplug your appliance or switch off the circuit breaker before attempting any maintenance or replacement work. This keeps you safe by preventing any risk of injury from electric shock.
• Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.
• Take your time and don’t rush while working to prevent accidents and personal injuries.
• Work in a well-lit area so you can clearly see and access the interior parts.
• Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with bare wet hands. Make sure the work area is completely dry.
• Check your user manual to see if there are specific installation or safety instructions for your part or appliance. 
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.
• Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury. 
• If the appliance has recently been used, give it plenty of time for any heating parts to cool down before working on it. 
• Take pictures or make a note of wiring terminals or other connections before disconnecting to prevent any problems with reassembly.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.

Tools and materials needed

• Multimeter
• Screwdrivers

Important: The specific tools required may vary depending on the model of your appliance and the type of fasteners used on it. Always consult the user manual or refer to any specific instructions provided by the manufacturer for the recommended tools for your appliance model.

Troubleshooting steps

1. The indoor unit coil inlet thermistor is typically located near the inlet of the indoor unit’s coil.
2. Locate the connector where the thermistor is plugged into the indoor unit’s circuit board. Carefully unplug the thermistor from the connector.
3. Using a digital multimeter, measure the resistance of the thermistor. The resistance should be approximately 5 kΩ (5,000 ohms) at 70°F (21°C). 
4. If the resistance is significantly different from this value, the thermistor is faulty and needs to be replaced.

Additional information

Thank you for reading! We hope this guide helped you get your LG multi split air conditioner working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos. 

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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Keep Reading: 

How to Clean Your Air Conditioner the Easy Way  

How to get better air quality from your window air conditioner

What is a Ductless Mini-Split Air Conditioner And How Does it Work?