LG Air Conditioner Service Manual Download

The LG Air Conditioner Service Manual provides comprehensive technical documentation for LG air conditioning systems, including installation procedures, troubleshooting guides, maintenance schedules, repair instructions, and technical specifications. This manual covers various LG AC models with detailed schematics, wiring diagrams, error codes, and service protocols for HVAC technicians and service professionals.

1. Features at a Glance 2. Installation Procedures 3. Technical Specifications 4. Control Systems 5. Electrical Connections 6. Refrigerant Handling 7. Maintenance Schedule 8. Error Codes & Diagnostics 9. Safety Precautions 10. Regulatory Compliance 11. Troubleshooting Guide

Features at a Glance

Key components: Compressor unit, evaporator coil, condenser unit, control board, refrigerant lines, drain system, and remote control.

Feature	Description
Compressor Type	Inverter technology for energy efficiency
Cooling Capacity	9,000 - 24,000 BTU models available
Energy Rating	ENERGY STAR certified models
Control System	Smart remote with LCD display
Air Filtration	Multi-stage filtration system
Operating Modes	Cool, Heat, Fan, Dry, Auto
Noise Level	Low dB operation for quiet performance
WiFi Connectivity	SmartThinQ compatible models
Installation Type	Window, wall-mounted, split system
Warranty	Standard 1-10 year limited warranty

Installation Procedures

Proper installation ensures optimal performance and energy efficiency.

Site Preparation: Select appropriate location with proper clearance and support.
Mounting: Secure indoor and outdoor units according to manufacturer specifications.
Refrigerant Lines: Connect copper lines with proper insulation and routing.
Electrical Wiring: Connect power supply and control wiring per electrical codes.
Drain System: Install condensate drain line with proper slope and termination.
Vacuum & Charge: Evacuate system and charge with specified refrigerant type.

WARNING! Installation must be performed by certified HVAC technician. Incorrect installation may void warranty.

Technical Specifications

Cooling Capacity: 9,000 - 24,000 BTU/h
Heating Capacity: 9,500 - 26,000 BTU/h (heat pump models)
Power Supply: 115V/230V, 60Hz
Refrigerant Type: R410A
Operating Temperature: 14°F to 115°F
Air Flow: 350 - 750 CFM
Dimensions: Varies by model (indoor/outdoor units)
Weight: 45-150 lbs depending on model
Sound Level: 19-55 dB
EER Rating: 10.0 - 12.5

Control Systems

Access control settings via remote or unit display panel. Front Panel: POWER, MODE, FAN SPEED, TEMPERATURE, TIMER.

Remote Control: POWER, MODE selection, TEMPERATURE adjustment, FAN SPEED, TIMER settings, SWING control, SLEEP mode, RESET function.

Temperature Control: 60°F - 86°F adjustable range. Fan Speed: Auto, Low, Medium, High, Turbo. Mode Selection: Cool, Heat, Fan, Dry, Auto. Timer Settings: 1-24 hour programmable timer. Smart Features: WiFi connectivity, voice control compatibility, energy monitoring.

Electrical Connections

Power supply requirements and control wiring specifications.

Disconnect power before servicing electrical components.
Verify voltage and amperage requirements match power supply.
Connect power cables to designated terminals (L1, L2, N, GND).
Install dedicated circuit with proper fuse/breaker protection.
Connect control wiring between indoor and outdoor units.
Verify all connections are secure and properly insulated.

CAUTION! Electrical work must comply with local codes and be performed by qualified electrician.

Refrigerant Handling

Proper refrigerant procedures for service and maintenance.

Recovery: Use approved recovery machine to remove refrigerant.
Evacuation: Pull vacuum to 500 microns or less.
Charging: Weigh in specified refrigerant amount.
Leak Testing: Use electronic leak detector or bubble solution.
Pressure Testing: Verify system holds pressure per specifications.
Documentation: Record refrigerant type and amount on service tag.

WARNING! EPA 608 certification required for refrigerant handling. Use proper PPE and follow safety protocols.

Maintenance Schedule

Regular maintenance ensures longevity and efficiency.

Frequency	Maintenance Task
Monthly	Clean or replace air filters
Seasonal	Clean condenser and evaporator coils
Annual	Check refrigerant charge and pressures
Annual	Inspect electrical connections and components
Annual	Clean drain line and pan
Annual	Verify thermostat calibration
Biannual	Lubricate moving parts (if required)
As needed	Clean outdoor unit of debris

Error Codes & Diagnostics

Common error codes and diagnostic procedures.

Error Code	Description	Resolution
CH 01	Room temperature sensor error	Check sensor resistance and wiring
CH 03	Pipe temperature sensor error	Inspect sensor and connections
CH 07	Communication error	Check wiring between indoor/outdoor units
CH 09	Outdoor unit error	Inspect outdoor PCB and components
CH 12	Compressor overload	Check compressor windings and capacitors
CH 15	IPM module error	Inspect power module and drivers
CH 21	DC fan motor error	Check fan motor and control board
CH 35	Refrigerant leak detection	Perform leak test and repair

Safety Precautions

Essential safety measures for installation and service.

Always disconnect power before servicing electrical components.
Use proper PPE including gloves and safety glasses.
Follow lockout/tagout procedures during maintenance.
Ensure proper ventilation when brazing or working with refrigerants.
Verify unit is properly grounded before energizing.
Use approved lifting equipment for heavy components.

WARNING! Failure to follow safety procedures may result in serious injury or death.

Regulatory Compliance

UL/ETL listed for safety standards. EPA compliance for refrigerant handling. ENERGY STAR certification for energy efficiency. Meets ASHRAE standards for performance. CARB compliance for California regulations. For technical support, visit www.lg.com or contact LG Customer Service at 1-800-243-0000.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Unit not cooling	Dirty filters/low refrigerant	Clean filters; check refrigerant charge
Unit not turning on	Power supply/thermostat	Check circuit breaker; verify thermostat settings
Water leakage	Clogged drain line	Clear drain line; check drain pan
Unusual noises	Loose parts/fan issues	Tighten components; inspect fan blades
Poor airflow	Dirty coils/blower	Clean evaporator coil; check blower wheel
Ice formation	Low refrigerant/dirty filters	Check charge; clean filters and coils
Error codes displayed	Sensor/control issues	Refer to error code chart; check sensors
Remote not working	Batteries/IR sensor	Replace batteries; clean IR sensor

Reset Procedure: Disconnect power for 5 minutes, then reconnect.

Service Support: 1-800-243-0000; www.lg.com