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Title
code
High temperature
in Discharge pipe
32
of the inverter
compressor
35
Low Presser Error
Problem in D-pipe
41
temperature
sensor
Problem in high
43
pressure sensor
Problem in
outdoor air
44
temperature
sensor
Problem in Cond.
middle pipe
45
temperature
sensor
Problem in suction
46
pipe temperature
sensor
Condenser out
48
pipe temperature
Error
PCB
52
Communication
Error
Open and Reverse
54
Phase Error
Cause of error
• Overload operation (Outdoor
fan constraint, screened,
blocked)
• Refrigerant leakage
(insufficient)
• Poor INV Comp Discharge sensor
• LEV connector displaced /
poor LEV assembly
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
Checking the communication
state between Main PCB and
Inverter PCB
Prevention of phase unbalance
and prevention of reverse
rotation of constant-rate
compressor
COMMISSIONING
Check point & Normal condition
• Check outdoor fan constraint/ screened/ flow
structure
• Check refrigerant leakage
• Check if the sensor is normal
• Check the status of EEV assembly
• 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
• Bad connection of thermistor connector
• Defect of thermistor connector (Open/Short)
• 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)
• Bad connection of thermistor connector
• Defect of thermistor connector (Open/Short)
• Defect of outdoor PCB(Inverter)
• Generation of noise source interfering with
communication
Main power wiring fault
185
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