Model reference

LG UD0

Air Conditioner

1 document37 error codes6 service modes

Available documentation

Service Manual

Air Conditioner Service Manual - Single "A"-Inverter Type113 pg
Covers this model

MyPros+ Max

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M+

M+ Max·LG Air Conditioner

01 on my LG UD0

M+

Indoor room thermistor error

From Service Manual 543530, p.22:

1.Access service mode to confirm the active fault code and read stored error history.

2.Disconnect the sensor and measure resistance. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens. A reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part 6322FR2046G

Temperature thermistor

Error codes (37)

CodeMeaning

01Indoor room thermistor error (open/short or faulty sensor).02Indoor inlet pipe sensor error (open/short or faulty sensor).03Remote controller communication error (wired remote controller).04Drain pump / float switch error.05Communication error between indoor and outdoor units.06Indoor outlet pipe sensor error (open/short or faulty sensor).07Different mode operation error.09EEPROM checksum error (indoor).10BLDC motor fan lock (indoor).21DC Peak / IPM Fault 22CT2 Max current 23DC Link low voltage (1ph 24Low pressure / high pressure switch open.25Low voltage / over voltage.26DC compressor position detect error.27PFC/PSC fault error 28DC Link high voltage (1ph 29Inverter compressor over current 32Discharge pipe temperature high for inverter compressor (≥105°C).33Discharge pipe temperature high for constant compressor (≥105°C).39Communication error between PFC Micom and INV Micom.40CT sensor error (open/short)41Inverter discharge pipe thermistor error (open/short).44Outdoor air thermistor error (open/short).45Condenser pipe thermistor error (open/short).46Suction pipe thermistor error (open/short).47Constant compressor discharge pipe thermistor error (open/short).51Over capacity 52Transmission error between inverter PCB and main PCB 53Communication signal error between indoor and outdoor units (displayed at…

View all 37 error codes

60EEPROM checksum error (outdoor).61Condenser pipe sensor temperature high (≥65°C).62Heat sink sensor temperature high (≥85°C).63Condenser pipe temperature low.65Heat sink thermistor error (open/short)67BLDC motor fan lock (outdoor).73PFC fault error (S/W)

Service modes (6)

Auto Addressing (Synchro Operation)1
Child LockPress the preset and minute setup button simultaneously for 3 seconds
E.S.P. (External Static Pressure) Setting Mode1
Forced OperationPress the ON/OFF button on the main unit display panel (for use when remote control is lost).
Installer Setting ModePress the designated button for 4 seconds until function code is displayed on the bottom of the LCD…
Test Run ModeFor ceiling cassette type

Full entry steps, exit procedures, and test sequences are available in Max.

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