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)
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)
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
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)
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)
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
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.
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
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
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,
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) .
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.
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
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.
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.
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.
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
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 )
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
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
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)
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)
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)
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)
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)