Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 197

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