LG Error Code List – Thermistor Chart


Ductless HVAC & PTAC Error Codes

LG Inverter units have a V in the model number, such as LSU121HSV and use a 3-phase compressor.
Single phase unit feed is converted to 3-phase to power the compressor in ODU PCB. Variable Hz controls compressor speed.
10 & 13 SEER single speed compressor systems (never a V in model number) show error codes at the indoor unit only.
Thermistor ohm charts including proper checkout procedure are at the end of this document.
The first digit in LG serial numbers is one-digit year (9=2009 or 2=2012). Second & third digits are two-digit month (07=July).

LG Error Code List

0 Error code not used
CO PCB sees IDU air thermistor as open or shorted. Must be 5,600Ω at 38°C/100°F & 20,700Ω at 10°C/50°F. Ohm thermistor in water, measure the water temperature, with perfect thermistor & plug connection, change PCB.
CA PCB sees ODU discharge pipe thermistor as open or shorted. Must be 244,000Ω at 20°C/68°F, 24.400Ω at 90°C/194°F. Ohm thermistor in water, measure water temperature-with perfect thermistor & plug connection, change PCB.
CC 13 SEER Flex Multi (with dual single speed compressors) EEPROM error. Too much combined capacity of IDUs in relation to ODU. 130% maximum. IDU EEPROM is small PCB the size of your thumbnail. Part will be referred to as PCB, Options on LG’s parts system.
Cd Reactor or electronic noise filter failure. Copper coil around magnet in ODU-replace this item. Same error code as 13
CE Compressor Phase Current Error, see error code #14
CL Child Lock. Press Timer & Min buttons simultaneously for 5 seconds to engage/disengage function.
HL Condensate pump float switch risen/open. Check drain pan is empty, check pump is working OK. If no pump, ensure blue jumper plug is inserted in IDU PCB plug CN_FLOAT.  If applicable, ensure Dry Contact Interface is in “OFF” condition. Check status and adjust as necessary. With Central Controller, if ALL system functions are locked, HL will appear and is not an error code.Po Jet Cool Mode: To cancel, press Jet Cool, Fan Speed or Set Temperature button.
RE PTAC set for wall-mount thermostat by setting DIP switch 1 to on position. DIP switch #1 off = touch pad controls on unit, DIP switch #1 on=remote thermostat.
PF PTAC Freeze Protection mode, indoor air thermistor shows PCB room temp less than 5°C/40°F. If room is not this temp, air thermistor = 5,600Ω at 38°C/100°F & 20,700Ω at 10°C/50°F. Ohm thermistor in water, measure water temperature-with perfect thermistor & plug connection, change PCB.

F1 Low speed fan on PTAC, this is normal.
F2 High speed fan on PTAC, this is normal.

1

LA09xHV, LA12xHV, LS902HPV and LS122HPV Inverter: PCB sees IDU pipe OR air thermistor as open or shorted. Pipe=2,800Ω at 38°C/100°F & 10,000Ω at 10°C /50°F. Air=5,600Ω at 38°C/100°F & 20,700Ω at 10°C/50°F. Ohm thermistor in water, measure water temperature-with perfect thermistor & plug connection, change PCB.
10 & 13 SEER: PCB sees IDU pipe OR air thermistor as open or shorted. Pipe=2,800Ω at 38°C/100°F & 10,000Ω at 10°C /50°F. Air=5,600Ω at
38°C/100°F & 20,700Ω at 10°C/50°F. Ohm thermistor in water, measure water temperature-with perfect thermistor & plug connection, change PCB.
PTAC: PCB sees IDU air thermistor as open or shorted. Must be 5,600Ω at 38°C/100°F & 20,700Ω at 10°C/50°F. Ohm thermistor in water, measure
the water temperature, measure water temperature-with perfect thermistor & plug connection, change PCB.

2





Inverter: PCB sees IDU inlet pipe thermistor as open or shorted. Must be 2,800Ω at 38°C / 100°F & 10,000Ω at 10°C/50°F. Ohm thermistor in water, measure the water temperature, with perfect thermistor & plug connection, change PCB.
LA09xHV, LA12xHV, LS902HPV , LS122HPV Inverter: PCB sees any ODU thermistor as open or shorted. Pipe=2,800Ω at 38°C/100°F & 10,000Ω at 10°C /50°F. Air=5,600Ω at 38°C/100°F & 20,700Ω at 10°C/50°F. Discharge = 244,000Ω at 20°C/68°F, 24.400Ω at 90°C/194°F.Ohm thermistor in water, measure water temperature, with perfect thermistor & plug connection, change PCB.
10 & 13 SEER: PCB sees any ODU or IDU pipe thermistor OR air thermistor as open or shorted. Pipe = 5,000Ω at 25°C / 77°F & 10,000Ω at 10°C/50°F. Air = 10,000Ω at 25°C/77°F & 20,700Ω at 10°C/50°F. Ohm thermistor in water, measure the water temperature, with perfect thermistor & plug connection, change PCB.
PTAC: PCB sees IDU pipe thermistor as open or shorted. Pipe must be 2,800Ω at 38°C / 100°F & 10,000Ω at 10°C/50°F. Ohm thermistor in water, measure water temperature-with perfect thermistor & plug connection, change PCB.

3-4-5

3-4-5

6-7-8-9

6-7-8-9

10-11-12-13-14-21-22-23-24-25-26

10-11-12-13-14-21-22-23-24-25-26

27-28-29-32-33-34-35-40-41-42-43-44-45-46-47

27-28-29-32-33-34-35-40-41-42-43-44-45-46-47

48-49-50-51-52-53-54-55-56-57-58-59-60-51-52-53-54-65-66

48-49-50-51-52-53-54-55-56-57-58-59-60-51-52-53-54-65-66

67-73-89

67-73-89

 

LG HVAC_error_codes.pdf



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