Manual for ARUN Series (1Ø, 208/230V, 60Hz)

Brand: LG logo LG

Category: Air Conditioner

Document Type: Manual

Language: EN

Available Languages: EN , ES

Uploaded: Nov. 21, 2025, 7:01 p.m.

Manual Publish Date: 2008-09-01

Warranty Information

Copyrighted material for training and service purposes only.

1. Basic Control: - Normal Operation: Manages compressor, fan, and EEVs for cooling, heating, and stop states. Includes notes on heating operation limits and DIP switch settings for temperature control. - Compressor Control: Utilizes Fuzzy Control to maintain stable evaporating (Te) and condensing (Tc) temperatures. - EEV Control: Operates Electronic Expansion Valves (EEVs) with fuzzy logic to regulate superheat in heating mode and subcooling in cooling mode. 2. Special Control: - Oil Return Control: Recovers compressor oil during cooling and heating modes by operating various components at specific frequencies and pulse settings. - Defrost: Eliminates ice on the heat exchanger to maintain performance, with specific operational sequences for outdoor and indoor units. - Stopping Operation: Details component operations during cooling and heating mode stops, including timing for hot gas bypass valve and 4-way valve. 3. Protection Control: - Pressure Protection Control: Defines high and low-pressure limits and corresponding actions for compressor, fan, and hot gas systems to prevent damage. 4. Other Control: - Initial Setup, Sensor Checking, Refrigerant Auto Charging, Refrigerant Checking, Pump Down, Pump Out, Night Silent Operation, Vacuum Mode, and Black Box Function are listed as other control features.

Troubleshooting and error codes

Error No.	Error Type	Error Point	Main Reasons
52	Transmission error between (Inverter PCB → Main PCB)	Main controller can't receive signal from inverter controller	1. Power cable or transmission cable is not connected 2. Defect of outdoor Main fuse/Noise Filter 3. Defect of outdoor Main / inverter PCB
53	Transmission error (Indoor unit → Main PCB)	In case Main PCB can't receive signal from indoor unit	1. Transmission cables are not connected 2. Transmission cables are short / open 3. Defect of outdoor Main / indoor PCB
60	Inverter PCB EEPROM error	EEPROM Access error and Check SUM error	1. EEPROM contact defect/wrong insertion 2. Different EEPROM Version 3. ODU inverter PCB assembly damage
62	Heatsink High error	Inverter PCB heatsink temperature is over 95°C(203°F)	1. Overload operation (Pipe clogging/ Covering/EEV defect/Ref. overcharge) 2. ODU fan locking 3. Heatsink assembly of INV PCB assemble condition abnormal 4. Defect of temperature sensing circuit part defect of INV PCB
65	Heatsink High error	Inverter PCB heatsink sensor is open or short	1. Heatsink assembly of INV PCB assemble condition abnormal 2. Defect of temperature sensing circuit part defect of INV PCB
67	Fan Lock Error	Fan RPM is 10RPM or less for 5 sec. when ODU fan starts or 40 RPM or less after fan starting.	1. Fan motor defect / assembly condition abnormal 2. Wrong connection of fan motor connector 3. Reversing rotation after RPM target apply 4. Inverter PCB assembly defect
73	AC input instant over current error (Matter of software)	Inverter PCB input power current is over 48A(peak) for 2ms	1. Overload operation (Pipe clogging/Covering/EEV defect/Ref. overcharge) 2. Compressor damage(Insulation damage/Motor damage) 3. Input voltage abnormal (L1,L2) 4. Power line assemble condition abnormal 5. Inverter PCB assembly damage(input current sensing part)
86	Main PCB EEPROM Error	EEPROM Access Error	1. No EEPROM 2. EEPROM wrong insertion
113	Outdoor unit liquid pipe (condenser) temperature sensor error	Abnormal sensor resistance value (Open/Short)	1. Defective temperature sensor connection 2. Defective temperature sensor (Open / Short) 3. Defective outdoor unit PCB
114	Outdoor unit sub-cooling inlet / outlet temperature sensor error	Abnormal sensor resistance value (Open/Short)	1. Defective temperature sensor connecter connection 2. Defective temperature sensor (Open/Short) 3. Defective outdoor PCB
151	Function error of outdoor 4way (reversing valve)	Function error of 4way (reversing valve) in Main	1. Wrong operation of 4way valve because of sludge etc. inflow 2. No pressure difference because of compressor fault 3. Wrong installation of In/outdoor common pipe 4. Defect of 4way valve