Specifications

SiBE341027 Troubleshooting by Remote Controller
Service Diagnosis 187
List of inverter-related error codes
Code Name Condition for determining error Major cause
Compressor current
L5 Instantaneous overcurrent of
inverter compressor
• Inverter output current exceeds 32.3A even
instantaneously.
• Liquid sealing
• Defective compressor
• Defective inverter PCB
L8 Overcurrent of inverter
compressor (Electronic thermal)
• Compressor overload running
An overcurrent of 19.0A or more continues for
a period of 5 consecutive seconds or that of
16.1A or more continues for a period of 260
consecutive seconds.
For 230V units:
A current of 33.5A or more continues for a
period of consecutive 5 sec. or that of 27.6A or
more continues for a period of consecutive
260 sec.
• The inverter loses synchronization.
• Back-flow of compressor liquid
• Sudden changes in loads
• Disconnected compressor wiring
• Defective inverter PCB
Protection device and others
L1 Defective inverter PCB • No output is given. • Defective heavy current part of
compressor
L9 Defective startup of inverter
compressor
• The compressor motor fails to start up. • Liquid sealing or defective
compressor
• Excessive oil or refrigerant
• Defective inverter PCB
E5 Inverter compressor lock • The compressor is in the locked status (does
not rotate).
• Defective compressor
L4 Radiation fin temperature rise • The radiation fin temperature reaches 188.6°F
or more (while in operation).
• Defective fan
• Running in overload for an
extended period of time
• Defective inverter PCB
U2 Power supply voltage error • The inverter power supply voltage is high or
low.
• Power supply error
• Defective inverter PCB
P1 Imbalanced power supply • Power supply voltages get significantly
imbalanced among three phases.
• Power supply error (imbalanced
voltages of 2% or more)
• Defective inverter PCB
• Dead inverter PCB
LC Transmission error (between
inverter PCB and service monitor
PCB)
• With the outdoor unit PCB, no
communications are carried out across
service monitor PCB - inverter PCB - fan PCB.
• Broken wire in communication
line
• Defective service monitor PCB
• Defective inverter PCB
• Defective fan PCB
PJ PCB mismatching • Any PCB of specification different from that of
the product is connected.
• PCB of different specification
mounted
P4 Defective radiation fin thermistor • The radiation fin thermistor gets short circuited
or open.
• Defective radiation fin thermistor
CHECK 9