Model reference

LG LCU340CP

Air Conditioner

2 documents30 error codes3 service modes

Available documentation

Service Manual

Ceiling Cassette Air Conditioner SERVICE MANUAL61 pg
Covers this model
Ceiling Cassette Air Conditioner SVC MANUAL (Exploded View)57 pg
Covers this model

MyPros+ Max

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01 on my LG LCU340CP

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Indoor room thermistor error

From Service Manual 949015, p.27:

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 (30)

CodeMeaning

01Indoor room thermistor error (open/short circuit, poor solder, or internal…02Indoor inlet pipe thermistor error (open/short circuit, poor solder, or…03Remote controller communication error (open/short or wrong connection on wired…04Drain pump / float switch error (float switch open when it should be shorted).05Communication error between indoor and outdoor units.06Indoor outlet pipe thermistor error (open/short circuit, poor solder, or…21DC Peak (IPM Fault).22CT2 (Max CT) error.23DC Link Low Voltage.24High/Low Pressure switch or Heatsink switch open.25Low Voltage / Over Voltage on input (below 140VAC or above 300VAC).26DC compressor position error.27PSC Fault Error.28DC Link High Voltage.32Discharge pipe temperature high on inverter compressor (105°C / 221°F).33Discharge pipe temperature high on constant compressor (105°C / 221°F).40CT Sensor 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 discharge pipe thermistor error (open/short).51Capacity error 53Signal error between indoor and outdoor units (displayed at outdoor unit).54Phase error.60EEPROM check sum error.61Condenser pipe sensor detected high temperature (65°C / 149°F).62Heat sink sensor detected high temperature (85°C / 185°F).63Condenser pipe temperature low.65Heatsink thermistor error (open/short).

Service modes (3)

Forced OperationAvailable per function list; specific button sequence not detailed in manual.
Test RunPress the room temperature checking button and down timer button simultaneously for 3 seconds.
Test Run (Forced Operation)Press the room temperature checking button and the down timer button simultaneously for 3 seconds…

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

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