SiUS281811EA Check
Part 6 Service Diagnosis 299
5.8 List of Inverter-Related Error Codes
CHECK 9
Code Name Condition for determining error Major cause
Compressor current
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
Protection device and others
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
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