The LG Arnu is a high-performance air conditioning unit featuring advanced cooling technology, energy efficiency ratings, smart connectivity options, and user-friendly controls. This service manual provides comprehensive information for installation, maintenance, troubleshooting, and repair procedures for certified technicians. Below are key sections covering technical specifications, installation guidelines, operational procedures, maintenance schedules, and diagnostic troubleshooting.
Key components: Compressor unit, evaporator coil, condenser unit, control board, remote controller, temperature sensors, refrigerant lines.
| Component | Description |
|---|---|
| Compressor | High-efficiency rotary compressor with inverter technology |
| Evaporator Coil | Copper tubing with aluminum fins for optimal heat exchange |
| Condenser Unit | Outdoor unit with fan motor and heat exchanger |
| Control Board | Main PCB with microprocessor and safety circuits |
| Remote Controller | Wireless remote with LCD display and programming functions |
| Temperature Sensors | Room and coil temperature monitoring sensors |
| Refrigerant Lines | Copper piping for refrigerant flow between units |
| Drain System | Condensate removal with pump option |
| Air Filters | Washable and replaceable filtration system |
| Electrical Connections | Power input and communication terminals |
Proper installation is critical for optimal performance and safety.
WARNING! Only certified technicians should perform installation. Incorrect installation may void warranty.
Power supply requirements and connection specifications.
| Terminal | Specification | Wire Size |
|---|---|---|
| L1, L2, N | 230V AC Power Input | 2.5 mm² minimum |
| Communication | Indoor-Outdoor Signal | Shielded cable 0.75 mm² |
| Ground | Protective Earth | 2.5 mm² green/yellow |
| Control Wiring | Remote/External Control | 0.75 mm² multi-core |
CAUTION! Disconnect power before servicing. Verify voltage matches unit specifications.
Operating modes and control functions available.
Refrigerant circuit specifications and service procedures.
WARNING! R410A operates at higher pressures than R22. Use appropriate gauges and tools.
| Component | Frequency | Procedure |
|---|---|---|
| Air Filters | Every 2 weeks | Clean with water, dry completely |
| Outdoor Unit | Every 3 months | Clean coil fins, check for debris |
| Indoor Unit | Every 6 months | Clean evaporator, check drain |
| Electrical | Annually | Check connections, measure voltage |
| Refrigerant | As needed | Check pressure, leak test if required |
| Fan Motors | Annually | Lubricate bearings if applicable |
Common error codes and their meanings.
| Code | Description | Possible Cause |
|---|---|---|
| E1 | Room temp sensor fault | Sensor disconnected or faulty |
| E2 | Evaporator temp sensor fault | Sensor wiring or connection issue |
| E3 | Communication error | Indoor-outdoor communication failure |
| E4 | System abnormality | Refrigerant pressure or flow issue |
| E5 | Over current protection | Compressor or fan motor overload |
| E6 | Compressor drive error | Inverter board or compressor fault |
| E7 | Outdoor fan error | Fan motor or driver circuit |
| E8 | Voltage error | Power supply voltage out of range |
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Unit not starting | Power supply, remote batteries | Check circuit breaker, replace batteries |
| Poor cooling | Dirty filters, low refrigerant | Clean filters, check refrigerant charge |
| Water leakage | Clogged drain, improper slope | Clear drain line, adjust slope |
| Unusual noise | Loose parts, fan obstruction | Tighten mounting, clear obstructions |
| Remote not working | Batteries, signal obstruction | Replace batteries, ensure line of sight |
| Error code displayed | Sensor or system fault | Refer to diagnostic codes section |
| Unit cycles on/off | Thermostat, dirty coils | Check sensor placement, clean coils |
Common replacement parts and procedures.
NOTE: Use only genuine LG replacement parts for optimal performance.
Essential safety guidelines for service technicians.
WARNING! Failure to follow safety procedures may result in injury or equipment damage.