LG air error codes

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 CodeContentsLED01G/M (Red)LED02G/M (Green)case of ErrorOutdoor Status
21DC Link Peak (IPM Fault)2times 31 times 3Over Rated CurrentOff
22CT 2 (Max CT)2times 3Input Over Current
23DC Link Low Volt.
DC Link High Volt.
3times 3DC Link Volt is below 140Vdc
DC Link Volt is above 420Vdc
25Low Voltage/Over Voltage5times 3Abnormal AC Volt Input
26DC Compressor Position Error6times 3Compressor Starting Fall Error
27PSC/PFC Fault Error7times 3Over Inverter PCB input current
29COMP Over Current9times 3Over Inverter Compressor Current
32D-Pipe High3times 32times 3D-Pipe Temp. High
35Low Pressure Error5times 3Excessive decrease of Low Pressure
39Communication Error9times 3Communication Error Between PFC Micom and INV Micom
40CT Sensor (Open/Short)4times 3oCT Circuit Malfunction
41INV. D-Pipe Th Error1 times 3Open/Short
43High Pressure Sensor Error3times 3
44Outdoor Air Th Error4times 3
45Cond. Mid-Pipe Th Error5times 3
46Suction Pipe Th Error6times 3
48Cond. Out-Pipe Th Error8times 3
51Capacity Over5times 31 times 3Over combination
53Signal Error (Indoor <-> Outdoor)3times 3Communication Poorly
543-Phase Wrong wiring4times 33-Phase Wrong Wring of Outdoor Unit (Reverse Phase/Omission of Phase)
60EEPROM Check Sum Error6times 3oCheck Sum Mismatching
61Cond. Pipe Th High1 times 3Cond. Temp. High
62Heaksink Th High2times 3Heatsink Temp. High
65Heaksink Th Error5times 3Open/Short
67Outdoor BLDC Fan Lock7times 3Outdoor Fan is not operation
73PFC Fault Error(SAN)7times 33times 3Over Current of Outdoor Unit PFC

LG BNU-BAC air error codes

Function NameCodeDescription
Read Coil Status01 hRun/Stop(status), Lock(status), Swing(status), Alarm, Filter Sign(status), Mode Lock(status), Wind Flow Lock(status)
Read Holding Registers03hOperation 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 Coil05hRun/Stop(setting), Lock(setting), Swing(setting), Filter Sign Reset, Mode Lock(setting),
Wind Flow Lock(setting)
Preset Single Registers06hOperation 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 codeTitleCause of errorCheck point & Normal condition
1Indoor air sensor• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor: 10KS2/ at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged)
2Indoor 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)
6Indoor outlet pipe sensor
3Communication
Wired R/C
• Open / Short
• Wrong connection
• Connection of wire
• Main PCB Volt. DC 12V
• Noise interference
4Drain 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.
21DC 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
22Max. C/TOver current (14A)Malfunction of compressor
Blocking of pipe
Low voltage input
Refrigerant, pipe length, blocked,...
40CfT
Internal circuit
Initial current errorMalfunction of current detection circuit.
(Open / Short)
The voltage of “C01N" Is 4.0Vdc(25A).
23DC Link
Low voltage.
• DC link volt, is 140Vdc.
• Check the power source.
• Check the components.
28DC Link
High voltage
• DC link volt, is 420Vdc T
24Press S/W Open• Low / High press
S/W open.
• Check the connection of “CN_Press”.
• Check the components.
25Input voltage• Abnormal Input voltage• Check the power source.
• Check the components.


26DC 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.
27PSC Fault• Over current at "IGBT"• Check the component of “IGBT".
• Check the components.
32D-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.
33D-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.
41D-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)
44Air sensor• Normal resistor: 10K£2 / at 25°C (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C (plugged)
45Condenser Pipe sensor• Normal resistor: 5K£2 / at 25°C (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C (plugged)
46Suction Pipe sensor
47D-pipe sensor (Constant)• Normal resistor: 200K£2 / at 25°C (Unplugged)
• Normal voltage : 4.5Vdc / at 25°C (plugged)
65Heat sink sensor• Normal resistor: 10K£2 / at 25°C (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C (plugged)
51Over capacity• Over capacity
Combination
• Check the indoor unit capacity.
• Check the combination table.
60EEPROM Check sum
• Check sum error• Check the PCB ASM P/No.
• Check the poor soldering.
61Condenser pipe sensor temp, high
• Condenser pipe sensor detected high temp.(65°C)
• Check the load condition.
• Check the sensor of Condenser pipe sensor.
62Heat 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.
21DC 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 DiagnosisPossible CausesWhat To Do
Code appears in the display. F1,F2 or F3Air conditioner is in FAN mode and the number shown is the set fan speed.This is normal. The air conditioner is working properly.
FLThe water collection tank is full.Empty the water collection tank.
CH01Short or open circuit in the indoor air thermistor.Unplug the air conditioner and contact your authorized LG service center.
CH02

LG LS090HSV4 air error codes

Error CodeDescriptionNo. of Times Indoor Unit LEDs Blink
LED1 (Plasma LED)LED2 (Power LED)
1Indoor unit room temperature sensor error1X-
2Indoor unit inlet pipe sensor error2X-
4Float switch error (optional)4X-
5Communication error between indoor unit and outdoor units-5X
6Indoor unit outlet pipe sensor error6X-
9Indoor unit EPROM error9X-
10Indoor unit BLDC motor fan lock-1X
12Indoor unit middle pipe sensor error2X
21DC Peak (IPM Fault); Compressor DC voltage was too high
22Current Transformed (CT2) error; Alternating current (AC) input too high2X
23DC Link Low Volt3X
25AC Low/High Volt5X
26DC Comp Position Error (not providing rotation), Locking6X
27PSC Fault; Current to inverter compressor between AC and DC converter circuit too high7X
28Inverter compressor DC voltage is too high8X
29Inverter compressor amperage is too high9X
31Current-to-current transformer (CT) thermistor is too low3X1X
32Inverter Compressor Discharge Pipe (D-Pipe) Overheat2X
40CT Sensor Error; Thermistor is disconnected or shorted out4X-
41D-Pipe Sensor INV is disconnected or shorted out1X
44Outdoor Air Sensor is disconnected or shorted out4X
45Middle thermistor of outdoor unit condenser coil is disconnected or shorted out5X
46Outdoor unit suction line thermistor is disconnected or shorted out6X
48Outdoor unit coil outlet (liquid line) thermistor is disconnected or shorted out8X
53Communication failure from outdoor unit to indoor unit5X3X
60Outdoor unit printed circuit board (PCB) EPROM check sum error6X-
61Outdoor unit condenser coil temperature is too high1X
62Outdoor unit inverter compressor PCB heat sink temperature is too high2X
63Condenser coil pipe thermistor temperature is too low3X
65Heat sink thermistor has disconnected or has shorted out5X
67Outdoor brushless direct current (BLDC) fan motor lock error7X

Back to Top