LG air conditioner – LG split AC - LG Inverter AC - Error codes – Causes and solution – CH1– CH2

ERROR CODE CAUSES AND SOLUTION - LG split AC 

CH 01
Indoor air sensor
 Connector connection error
 Faulty PCB
 Faulty sensor (Open / Short)
Normal resistor : 10K Ohms/ at 25 Degree C (Unplugged)

Normal voltage : 2.5Vdc / at 25 Degree C (Plugged)

CH 02

Indoor inlet pipe sensor
 Connector connection error
 Faulty PCB
Faulty sensor (Open / Short)
Normal resistor : 5K Ohms/ at 25 Degree C (Unplugged)

Normal voltage : 2.5Vdc / at 25 Degree C (Plugged)

CH 03

Communication Error (Wired remote controller)
 Connector connection error
 Faulty PCB / Remote controller
 Connection wire break
 Connection of wire
 Main PCB Volt. DC12V
 Noise interference

CH 04

Drain pump/ Float switch
 Float switch open. (Normal : short)
 Water over flow
 The connection of wire (Drain pump/ Float switch)
 Drain pump power input. (220V)
 Drain tube installation.
 Indoor unit installation. (Inclination)

CH 06
Indoor outlet pipe sensor
 Connector connection error
 Faulty PCB
 Faulty sensor (Open / Short)
Normal resistor : 5K Ohms / at 25 Degree C (Unplugged)

Normal voltage : 2.5Vdc / at 25 Degree C (Plugged)

CH 09
EEPROM Check sum (Indoor)
 Check sum error
 Check the poor soldering.
 Change PCB

CH 10
BLDC motor fan lock (Indoor)
 Fan motor break down
 Fan motor & PCB poor contact
 Obstruction to the fan
 Check the indoor fan motor.
 Check the connection status between
 PCB and fan motor.

CH 05/21

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

CH 53
Communication
(Indoor <>Outdoor)
 The connector for trans mission is disconnected.
 The connecting wires are misconnected.
 The communication line is break
 Outdoor PCB is abnormal.
 Indoor PCB is abnormal.
 Check power input AC 230V. (Outdoor, Indoor)
 Check connector for transmission
 Check wires are misconnecting.
 Check transmission circuit of outdoor PCB
 Check transmission circuit of indoor PCB

CH 22

Max. C/T

 Over current
 Malfunction of compressor
 Blocking of pipe
 Low voltage input
 Refrigerant, pipe length, blocked,

CH 40

C/TInternal circuit

 Initial current error

 Malfunction of current detection circuit. (Open / Short)
 The voltage of “C01N” Is 4.0Vdc (25A) .

CH 23
DC Link Low voltage.
 1ph : DC link volt. Is 140Vdc .
 3ph : DC link volt. Is 250Vdc
 Check the power source.
 Check the components.

CH 28
DC Link High voltage
 1ph : DC link volt. is 140Vdc .
 3ph : DC link volt. is 250Vdc .
 Check the power source.
 Check the components.
CH 25
Input voltage
 Abnormal Input voltage (140Vac , 300Vac )
 Check the power source.
 Check the components.
CH 24

Press S/W Open

 Low / High press S/W open.
 Check the connection of “CN_PRESS”
 Check the SVC V/V open.
 Check the leakage of refrigerant.

CH 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.

CH 27
PSC Fault
PFC Fault
 Over current at “IGBT”/PFC module
 Check the component of “IGBT” /PFC module.
 Check the components.

CH 29

Inverter compressor over current
Inverter compressor input current is over 30A
1. Overload operation
(Pipe clogging/Covering/EEV defect/Ref. over charge)
2. Compressor damage(Insulation damage/Motor damage)
3. Input voltage low
4. ODU inverter PCB assembly damage

CH 32
D-pipe (Inverter) temp. high (105 Degree C )

 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.
CH 33

D-pipe (Constant) temp. high (105 Degree C )

 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.
CH 39
Transmission Error
Between (PFC Micom  >INV Micom)
Communication Error Between PFC Micom and INV Micom.
1. Micom defect/Circuit defect
2. Different Micom S/W Version
3. ODU inverter PCB assembly damage

CH 41/47
D-pipe sensor(Inv)
D-pipe sensor(Cons)
 Connector connection error
 Faulty PCB
 Faulty sensor (Open / Short)
 Normal resistor : 200K Ohms/ at 25 Degree C (Unplugged)

 Normal voltage : 4.5Vdc / at 25 Degree C (plugged)

CH 44

Air sensor
 Connector connection error
 Faulty PCB
 Faulty sensor (Open / Short)
Normal resistor : 10K Ohms/ at 25 Degree C (Unplugged)

 Normal voltage : 2.5Vdc / at 25 Degree C (plugged)

CH 45/46
Condenser Pipe sensor Suction Pipe sensor
 Connector connection error
 Faulty PCB
 Faulty sensor (Open / Short)
 Normal resistor : 5K Ohms/ at 25 Degree C (Unplugged)

 Normal voltage : 2.5Vdc / at 25 Degree C (plugged)

CH 65
Heat sink sensor
 Connector connection error
 Faulty PCB
 Faulty sensor (Open / Short)
 Normal resistor : 5K Ohms/ at 25 Degree C (Unplugged)

 Normal voltage : 2.5Vdc / at 25 Degree C (plugged)