LG THERMA V Installation Manual page 274

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