LG AC Error Code List, A Step-by-Step Guide to Fix It

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 Normal resistor: 5K£2/ at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged) 6 Indoor outlet pipe sensor • Internal circuit error – 3 Communication • Open / Short • Connection of wire 3 Wired R/C • Wrong connection • 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) апр.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 • DC link volt, is 140Vdc. • Check the power source. 23 Low voltage. – • Check the components. 28 DC Link High voltage • DC link volt, is 420Vdc T – 24 Press S/W Open • Low / High press • 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) 46 Suction Pipe sensor – • Normal voltage : 2.5Vdc / at 25°C (plugged) 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 • 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. май.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
• Overload condition
– Overcharging of refrigerant
Pipe length.
Outdoor Fan is stop
• Poor insulation of compressor