Daikin REYQ8-48PY1B - Page 405

SiBE37-701_B Troubleshooting (OP: Unified ON/OFF Controller)
Troubleshooting 394
[Check 14] List of inverter-related malfunction codes
Code Name Condition for determining malfunction Major cause
Compressor current
L5 Instantaneous overcurrent of
inverter compressor
• Inverter output current exceeds 32.3A even
instantaneously.
• Liquid sealing
• Faulty compressor
• Faulty 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.
• The inverter loses synchronization.
• Backflow of compressor liquid
• Sudden changes in loads
• Disconnected compressor wiring
• Faulty inverter PCB
Protection device and others
L1 Faulty inverter PCB • No output is given. • Faulty heavy current part of
compressor
L9 Faulty startup of inverter
compressor
• The compressor motor fails to start up. • Liquid sealing or faulty
compressor
• Excessive oil or refrigerant
• Faulty inverter PCB
E5 Inverter compressor lock • The compressor is in the locked status (does
not rotate).
• Faulty compressor
L4 Radiator fin temperature rise • The radiator fin temperature reaches 87°C or
more (while in operation).
• Malfunction of fan
• Running in overload for an
extended period of time
• Faulty inverter PCB
U2 Power supply voltage error • The inverter power supply voltage is high or
low.
• Power supply error
• Faulty inverter PCB
P1 Imbalanced power supply • Power supply voltages get significantly
imbalanced among three phases.
• Power supply error (imbalanced
voltages of 2% or more)
• Faulty inverter PCB
• Dead inverter PCB
LC Transmission error (between
inverter PCB and control PCB)
• With the outdoor unit PCB, no
communications are carried out across control
PCB - inverter PCB - fan PCB.
• Broken wire in communication
line
• Faulty control PCB
• Faulty inverter PCB
• Faulty fan PCB
PJ PCB mismatching • Any PCB of specification different from that of
the product is connected.
• PCB of different specification
mounted
P4 Faulty fin thermistor • The fin thermistor gets short-circuited or open. • Faulty fin thermistor