Modern systems of the LG firm adjusting a temperature mode in premises are rather complex constructively. An error of any LG air conditioner can lead to the malfunctions, the removal of which will come at a high cost. Therefore, all the air conditioners are fit with a self-diagnostics device capable to block, in a case of faults, the operation of an air conditioner and show an error code on an internal block. These error codes can be decoded with help of the table below.
LG AMNW07GDBL1 air error codes
| Error Code | Contents | LED01G/M (Red) | LED02G/M (Green) | case of Error | Outdoor Status |
| 21 | DC Link Peak (IPM Fault) | 2times 3 | 1 times 3 | Over Rated Current | Off |
| 22 | CT 2 (Max CT) | 2times 3 | Input Over Current | ||
| 23 | DC Link Low Volt. DC Link High Volt. |
3times 3 | DC Link Volt is below 140Vdc DC Link Volt is above 420Vdc |
||
| 25 | Low Voltage/Over Voltage | 5times 3 | Abnormal AC Volt Input | ||
| 26 | DC Compressor Position Error | 6times 3 | Compressor Starting Fall Error | ||
| 27 | PSC/PFC Fault Error | 7times 3 | Over Inverter PCB input current | ||
| 29 | COMP Over Current | 9times 3 | Over Inverter Compressor Current | ||
| 32 | D-Pipe High | 3times 3 | 2times 3 | D-Pipe Temp. High | |
| 35 | Low Pressure Error | 5times 3 | Excessive decrease of Low Pressure | ||
| 39 | Communication Error | 9times 3 | Communication Error Between PFC Micom and INV Micom | ||
| 40 | CT Sensor (Open/Short) | 4times 3 | o | CT Circuit Malfunction | |
| 41 | INV. D-Pipe Th Error | 1 times 3 | Open/Short | ||
| 43 | High Pressure Sensor Error | 3times 3 | |||
| 44 | Outdoor Air Th Error | 4times 3 | |||
| 45 | Cond. Mid-Pipe Th Error | 5times 3 | |||
| 46 | Suction Pipe Th Error | 6times 3 | |||
| 48 | Cond. Out-Pipe Th Error | 8times 3 | |||
| 51 | Capacity Over | 5times 3 | 1 times 3 | Over combination | |
| 53 | Signal Error (Indoor <-> Outdoor) | 3times 3 | Communication Poorly | ||
| 54 | 3-Phase Wrong wiring | 4times 3 | 3-Phase Wrong Wring of Outdoor Unit (Reverse Phase/Omission of Phase) | ||
| 60 | EEPROM Check Sum Error | 6times 3 | o | Check Sum Mismatching | |
| 61 | Cond. Pipe Th High | 1 times 3 | Cond. Temp. High | ||
| 62 | Heaksink Th High | 2times 3 | Heatsink Temp. High | ||
| 65 | Heaksink Th Error | 5times 3 | Open/Short | ||
| 67 | Outdoor BLDC Fan Lock | 7times 3 | Outdoor Fan is not operation | ||
| 73 | PFC Fault Error(SAN) | 7times 3 | 3times 3 | Over Current of Outdoor Unit PFC |
LG BNU-BAC air error codes
| Function Name | Code | Description |
| Read Coil Status | 01 h | Run/Stop(status), Lock(status), Swing(status), Alarm, Filter Sign(status), Mode Lock(status), Wind Flow Lock(status) |
| Read Holding Registers | 03h | Operation Mode(status), Fan Speed(status), Room Temperature, Error Code, |
| Set Room Temperature(status), | ||
| Set Lower Temperature(status), | ||
| Set Upper Temperature(status), | ||
| User Mode(status) | ||
| Force Single Coil | 05h | Run/Stop(setting), Lock(setting), Swing(setting), Filter Sign Reset, Mode Lock(setting), |
| Wind Flow Lock(setting) | ||
| Preset Single Registers | 06h | Operation Mode(setting), Fan Speed(setting), Set Room Temperature(setting), |
| Set Lower Temperature(setting), | ||
| Set Upper Temperature(setting), | ||
| User Mode(setting) |
LG FM15AH UL3 Svc air error codes
| Display code | Title | Cause of error | Check point & Normal condition |
| 1 | Indoor air sensor | • Open / Short • Soldered poorly • Internal circuit error |
Normal resistor: 10KS2/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) |
| 2 | Indoor inlet pipe sensor | • Open / Short • Soldered poorly • Internal circuit error |
Normal resistor: 5K£2/ at 25°C (Unplugged) Normal voltage : 2.5Vdc / at 25°C (plugged) |
| 6 | Indoor outlet pipe sensor | ||
| 3 | Communication Wired R/C |
• Open / Short • Wrong connection |
• Connection of wire • Main PCB Volt. DC 12V • Noise interference |
| 4 | Drain pump/Float switch | • Float switch Open. (Normal: short) | • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (220V) • Drain tube installation. • Indoor unit installation. (Inclination) |
| 4/53 | Communication (Indoor ► Outdoor) | • Communication poorly | • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The GND1,2 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. |
| 21 | DC Peak | • Instant over current • Over Rated current • Poor insulation of IPM |
• An instant over current in the U,V,W phase – Comp lock – The abnormal connection of U,V,W • Over load condition – Overcharging of refrigerant – Pipe length. • Poor insulation of compressor |
| 22 | Max. C/T | Over current (14A) | Malfunction of compressor Blocking of pipe Low voltage input Refrigerant, pipe length, blocked,… |
| 40 | CfT Internal circuit |
Initial current error | Malfunction of current detection circuit. (Open / Short) The voltage of “C01N” Is 4.0Vdc(25A). |
| 23 | DC Link Low voltage. |
• DC link volt, is 140Vdc. | • Check the power source. • Check the components. |
| 28 | DC Link High voltage |
• DC link volt, is 420Vdc T | |
| 24 | Press S/W Open | • Low / High press S/W open. |
• Check the connection of “CN_Press”. • Check the components. |
| 25 | Input voltage | • Abnormal Input voltage | • Check the power source. • Check the components. |
| 26 | DC Compressor Position |
• Compressor position detect error | • Check the connection of comp wire “U,V,W” • Malfunction of compressor • Check the component of “IPM”, detection parts. |
| 27 | PSC Fault | • Over current at “IGBT” | • Check the component of “IGBT”. • Check the components. |
| 32 | D-pipe (Inverter) temp, high (105°C t) | • Discharge sensor (Inverter) temp, high | • Check the discharge pipe sensor for INV. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. |
| 33 | D-pipe (Constant) temp, high (105°C I) | • Discharge sensor (Cons.) temp, high | • Check the discharge pipe sensor for Cons. • Check the install condition for over load. • Check the leakage of refrigerant. • Check the SVC V/V open. |
| 41 | D-pipe sensor (Inverter) | • Open / Short • Soldered poorly • Internal circuit error |
• Normal resistor: 200K£2 / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged) |
| 44 | Air sensor | • Normal resistor: 10K£2 / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged) |
|
| 45 | Condenser Pipe sensor | • Normal resistor: 5K£2 / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged) |
|
| 46 | Suction Pipe sensor | ||
| 47 | D-pipe sensor (Constant) | • Normal resistor: 200K£2 / at 25°C (Unplugged) • Normal voltage : 4.5Vdc / at 25°C (plugged) |
|
| 65 | Heat sink sensor | • Normal resistor: 10K£2 / at 25°C (Unplugged) • Normal voltage : 2.5Vdc / at 25°C (plugged) |
|
| 51 | Over capacity | • Over capacity Combination |
• Check the indoor unit capacity. • Check the combination table. |
| 60 | EEPROM Check sum | • Check sum error | • Check the PCB ASM P/No. • Check the poor soldering. |
| 61 | Condenser pipe sensor temp, high | • Condenser pipe sensor detected high temp.(65°C) | • Check the load condition. • Check the sensor of Condenser pipe sensor. |
| 62 | Heat sink sensor temp, high | • Heat sink sensor detected high temp.(85°C) | • Check the fan is locked. • Check the sensor of heat sink. |
| 5/53 | Title Communication (Indoor ► Outdoor) |
• Communication poorly | • Power input AC 220V. (Outdoor, Indoor) • The connector for transmission is disconnected. • The connecting wires are misconnected. • The communication line is shorted at GND. • Transmission circuit of outdoor PCB is abnormal. • Transmission circuit of indoor PCB is abnormal. |
| 21 | DC PEAK (IPM Fault) |
• Instant over current • Over Rated current • Poor insulation of IPM |
• An instant over current in the U,V,W phase – Comp lock – The abnormal connection of U,V,W • Over load condition – Overcharging of refrigerant Pipe length. Outdoor Fan is stop • Poor insulation of compressor |
LG LP2525GXR air error codes
| Self Diagnosis | Possible Causes | What To Do |
| Code appears in the display. F1,F2 or F3 | Air conditioner is in FAN mode and the number shown is the set fan speed. | This is normal. The air conditioner is working properly. |
| FL | The water collection tank is full. | Empty the water collection tank. |
| CH01 | Short or open circuit in the indoor air thermistor. | Unplug the air conditioner and contact your authorized LG service center. |
| CH02 | (error solution ch02) |
LG LS090HSV4 air error codes
| Error Code | Description | No. of Times Indoor Unit LEDs Blink | |
| LED1 (Plasma LED) | LED2 (Power LED) | ||
| 1 | Indoor unit room temperature sensor error | 1X | – |
| 2 | Indoor unit inlet pipe sensor error | 2X | – |
| 4 | Float switch error (optional) | 4X | – |
| 5 | Communication error between indoor unit and outdoor units | – | 5X |
| 6 | Indoor unit outlet pipe sensor error | 6X | – |
| 9 | Indoor unit EPROM error | 9X | – |
| 10 | Indoor unit BLDC motor fan lock | – | 1X |
| 12 | Indoor unit middle pipe sensor error | 2X | |
| 21 | DC Peak (IPM Fault); Compressor DC voltage was too high | ||
| 22 | Current Transformed (CT2) error; Alternating current (AC) input too high | 2X | |
| 23 | DC Link Low Volt | 3X | |
| 25 | AC Low/High Volt | 5X | |
| 26 | DC Comp Position Error (not providing rotation), Locking | 6X | |
| 27 | PSC Fault; Current to inverter compressor between AC and DC converter circuit too high | 7X | |
| 28 | Inverter compressor DC voltage is too high | 8X | |
| 29 | Inverter compressor amperage is too high | 9X | |
| 31 | Current-to-current transformer (CT) thermistor is too low | 3X | 1X |
| 32 | Inverter Compressor Discharge Pipe (D-Pipe) Overheat | 2X | |
| 40 | CT Sensor Error; Thermistor is disconnected or shorted out | 4X | – |
| 41 | D-Pipe Sensor INV is disconnected or shorted out | 1X | |
| 44 | Outdoor Air Sensor is disconnected or shorted out | 4X | |
| 45 | Middle thermistor of outdoor unit condenser coil is disconnected or shorted out | 5X | |
| 46 | Outdoor unit suction line thermistor is disconnected or shorted out | 6X | |
| 48 | Outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out | 8X | |
| 53 | Communication failure from outdoor unit to indoor unit | 5X | 3X |
| 60 | Outdoor unit printed circuit board (PCB) EPROM check sum error | 6X | – |
| 61 | Outdoor unit condenser coil temperature is too high | 1X | |
| 62 | Outdoor unit inverter compressor PCB heat sink temperature is too high | 2X | |
| 63 | Condenser coil pipe thermistor temperature is too low | 3X | |
| 65 | Heat sink thermistor has disconnected or has shorted out | 5X | |
| 67 | Outdoor brushless direct current (BLDC) fan motor lock error | 7X |