Troubleshooting Guide

 

 

 

 

 

Error

Title

Cause of error

Check point & Normal condition

 

code

 

 

 

 

 

 

 

 

 

 

 

 

 

• Power input AC 230V.(Outdoor, Indoor)

 

 

 

 

• The connector for transmission is disconnected.

 

05 / 53

Communication

 

• The connecting wires are misconnected.

 

(Indoor Outdoor)

• Communication poorly

• The GND 1,2 is not connected at main GND.

 

 

 

 

 

 

• The communication line is shorted at GND.

 

 

 

 

• Transmission circuit of outdoor PCB is abnormal.

 

 

 

 

• Transmission circuit of indoor PCB is abnormal.

 

 

 

 

 

 

Check Point

1.Check the input power AC 230V.(Outdoor, Indoor)

2.Check the communication wires are correctly connected.

Adjust the connection of wire

Confirm the wire of "Live", "Neutral".

3.Check the resistance between communication line and GND.(Normal : Over 2M)

4.Check the connector for communication is correctly connected.

5.Check the connection of GND1, GND2, and main GND.

6.If one indoor unit is operated normally, outdoor PCB is no problem.

Check the another indoor unit.

* CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.

Service Manual 73

Page 73
Image 73
LG Electronics AMNC123DEA0(LMN120CE) Power input AC 230V.Outdoor, Indoor, Communication line is shorted at GND

A3UH363FA0(LMU360HE), AMNC123DEA0(LMN120CE), AMNC093D4A0(LMN090CE), AMNH123DEA0(LMN120HE), A3UC363FA0(LMU360CE) specifications

LG Electronics is renowned for its innovation in the home appliance sector, particularly in air conditioning systems. Among its diverse range, the AMNC123APM0, A3UC363FA0, AMNH123DEA0, AMNC093D4A0, and AMNC123DEA0 model series stand out for their advanced features and energy efficiency.

The AMNC123APM0, also referred to as LMAN120CNS, offers a powerful air conditioning solution ideal for medium to large spaces. Featuring a sleek design, it combines aesthetics with functionality. This model utilizes LG's inverter technology, which helps maintain a consistent temperature while significantly reducing energy consumption. Additionally, it comes equipped with a dual inverter compressor that operates quietly, making it perfect for residential settings.

The A3UC363FA0, or LMU360CE, is another standout model that caters to the installation needs of multi-zone systems. Its flexibility allows users to connect multiple indoor units, ensuring efficient air distribution across different spaces. This model also features advanced filtration systems that improve indoor air quality by reducing allergens and other harmful particles.

AMNH123DEA0, branded as LMN120HE, introduces enhanced energy efficiency through its intelligent energy management systems. This unit is designed with user-friendly controls and smart technology to optimize performance based on user preferences. Its compact design makes it suitable for smaller spaces while still delivering powerful cooling and heating functions.

The AMNC093D4A0, known as LMN090CE, is perfect for residential applications where space is a consideration. It boasts a high SEER (Seasonal Energy Efficiency Ratio) rating, indicating low energy consumption while still providing optimal cooling. The model is equipped with a variety of operational modes, including dehumidification and fan-only options.

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