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SiUS331708EA
Check
Service Diagnosis
264
5.8
List of Inverter-Related Error Codes
Code
Name
Condition for determining error
Major cause
Co
mpres
s
or curre
nt
L5
Instantaneous overcurrent of
inverter compressor
• Inverter output current exceeds 59.1 A even
instantaneously.
• Liquid sealing
• Defective compressor
• Defective inverter PCB
L8
Overcurrent of inverter
compressor
(Electronic superheating
protection sensor)
• Compressor overload running
A current of 33.5 A or more continues for a
period of consecutive 5 seconds or that of
27.6 A or more continues for a period of
consecutive 260 seconds.
• The inverter loses synchronization.
• Back-flow of compressor liquid
• Sudden changes in loads
• Disconnected compressor wiring
• Defective PCB
P
rot
ect
ion device and ot
hers
E5
Inverter compressor lock
• The compressor is in the locked status (does
not rotate).
• Defective compressor
L1
Defective PCB (for inverter
compressor)
• No output is given.
• Defective heavy current part of
compressor
L4
Radiation fin temperature rise
• The radiation fin temperature reaches 87°C
(188°F) or more (while in operation).
• Defective fan
• Running in overload for an
extended period of time
• Defective PCB
L9
Defective startup of inverter
compressor
• The compressor motor fails to start up.
• Liquid sealing or defective
compressor
• Excessive oil or refrigerant
• Defective PCB
LC
Transmission error (between
microcomputers on the outdoor
main PCB)
• No communications are carried out across the
microcomputers on the outdoor main PCB.
• Defective outdoor main PCB
P1
Imbalanced power supply
• Power supply voltages get significantly
imbalanced among three phases.
• Power supply error (imbalanced
voltages of 2% or more)
• Defective PCB
• Dead PCB
P4
Defective radiation fin thermistor
• The radiation fin thermistor gets short circuited
or open.
• Defective radiation fin thermistor
U2
Power supply voltage error
• The inverter power supply voltage is high or
low.
• Power supply error
• Defective PCB
CHECK 9
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