LG THERMA V, Installation Manual, Page: 274 / 277

274
COMMISSIONING
ENGLISH
Display
code
Title Cause of error Check point & Normal condition
35 Low Presser Error Excessive decrease of low pressure
• Defective low pressure sensor
• Defective unit fan
• Refrigerant shortage/leakage
• Deformation because of damage of refrigerant pipe
• Defective unit EEV
• Covering / clogging (unit covering during the cooling
mode / unit filter clogging during heating mode)
• SVC valve clogging
• Defective unit PCB(Inverter)
• Defective unit pipe sensor
41
Problem in D-pipe
temperature sensor
• Open / Short
• Soldered poorly
• Internal circuit error 1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)
43
Problem in high
pressure sensor Abnormal value of sensor
(Open/Short)
• Bad connection of connector PCB(Inverter)
• Bad connection high pressure connector
• Defect of high pressure connector (Open/Short)
• Defect of connector PCB(Inverter) (Open/Short)
• Defect of PCB(Inverter)
44
Problem in outdoor
air temperature
sensor • Open / Short
• Soldered poorly
• Internal circuit error 1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)
45
Problem in Cond.
middle pipe
temperature sensor • Open / Short
• Soldered poorly
• Internal circuit error 1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)
46
Problem in suction
pipe temperature
sensor • Open / Short
• Soldered poorly
• Internal circuit error 1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)
52
PCB Communication
Error
Checking the communication state
between Main PCB and Inverter
PCB
• Generation of noise source interfering with
communication
54
Open and Reverse
Phase Error
Prevention of phase unbalance and
prevention of reverse rotation of
constant-rate compressor
Main power wiring fault
60
PCB(Inverter) &
Main EEPROM
check sum error
EEPROM Access error and Check
SUM error
1. EEPROM contact defect/wrong insertion
2. Different EEPROM Version
3. ODU Inverter & Main PCB assembly 1 damage
61
High temperature
in Cond. Pipe
• Overload operation (Outdoor fan
constraint, screened, blocked)
• Unit heat exchanger contaminated
• EEV connector displaced / poor
EEV assembly
• Poor Cond. Pipe sensor assembly /
burned
• Check outdoor fan constraint / screened / flow structure
• Check if refrigerant overcharged
• Check the status of EEV assembly
• Check the status of sensor assembly / burn