Daikin RXYQ96PYDN Service Manual page 486

SiUS34-801A_b
[Check 14] List of inverter-related malfunction codes
Code
L5 Instantaneous overcurrent of
inverter compressor
L8 Overcurrent of inverter
compressor (Electronic thermal)
L1 Faulty inverter PC board
L9 Faulty startup of inverter
compressor
E5 Inverter compressor lock
L4 Radiator fin temperature rise
U2 Power supply voltage error
P1 Imbalanced power supply
LC Transmission error (between
inverter PC board and control PC
board)
PJ PC board mismatching
P4 Faulty fin thermistor
Troubleshooting
Name Condition for determining malfunction
• 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 radiator 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 PC board, no
communications are carried out across control
PC board - inverter PC board - fan PC board.
• Any PC board of specification different from
that of the product is connected.
• The fin thermistor gets short-circuited or open. • Faulty fin thermistor
Troubleshooting (OP: Unified ON/OFF Controller)
• Liquid sealing
• Faulty compressor
• Faulty inverter PC board
• Back-flow of compressor liquid
• Sudden changes in loads
• Disconnected compressor wiring
• Faulty inverter PC board
• Faulty heavy current part of
compressor
• Liquid sealing or faulty
compressor
• Excessive oil or refrigerant
• Faulty inverter PC board
• Faulty compressor
• Malfunction of fan
• Running in overload for an
extended period of time
• Faulty inverter PC board
• Power supply error
• Faulty inverter PC board
• Power supply error (imbalanced
voltages of 2% or more)
• Faulty inverter PC board
• Dead inverter PC board
• Broken wire in communication
line
• Faulty control PC board
• Faulty inverter PC board
• Faulty fan PC board
• PC board of different
specification mounted
Major cause
471