LG split air conditioner error codes

Problem

Indoor Room Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check room temperature thermistor.
• Replace if open/short.

Problem

Indoor Pipe Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check pipe thermistor on evaporator.
• Replace if faulty.

Problem

Remote Control Communication Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check remote signal receiver and wiring on indoor printed circuit board.

Problem

Indoor/Outdoor Communication Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check communication wire between indoor unit-outdoor unit.
• Verify power to both units.

Problem

Outdoor DC Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check current sensor on outdoor printed circuit board.

Problem

Outdoor Pipe Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check outdoor pipe thermistor and wiring.

Problem

Outdoor Fan Motor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check outdoor fan motor and capacitor.

Problem

Compressor Discharge Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check discharge temperature sensor.

Problem

Outdoor DC Peak Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check compressor winding and inverter printed circuit board.

Problem

Current transformer sensor error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check the current transformer sensor on the outdoor printed circuit board.

Problem

DC Link Voltage Low

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check power supply voltage and rectifier circuit.

Problem

Outdoor compressor top overheat

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check gas charge and compressor health.

Problem

PSC Fault

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check phase sensor circuit on inverter printed circuit board.

Problem

Outdoor Discharge High Temp

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check refrigerant level.
• Clean condenser coil.

Problem

Outdoor Ambient Sensor Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check outdoor ambient temperature sensor.

Problem

Second current transformer sensor error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Check the secondary current sensor on the printed circuit board.

Problem

Outdoor EEPROM Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Replace outdoor main printed circuit board.

Problem

Indoor EEPROM Error

Causes

The control system is reporting this fault. Use the checks below to narrow down wiring, sensors, supply, or mechanical issues.

Fix

• Replace indoor main printed circuit board.