Daikin RXYQ96PYDN, Service Manual

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SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller)
Troubleshooting 471
[Check 14] List of inverter-related malfunction codes
Code Name Condition for determining malfunction Major cause
C
o
mpres
s
o
r c
u
rr
ent
L5 Instantaneous overcurrent of
inverter compressor • Inverter output current exceeds 32.3A even
instantaneously.
• Liquid sealing
• Faulty compressor
• Faulty inverter PC board
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
• Faulty inverter PC board
Protection d
evice
and others
L1 Faulty inverter PC board • 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 PC board
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 188.6°F
or more (while in operation).
• Malfunction of fan
• Running in overload for an
extended period of time
• Faulty inverter PC board
U2 Power supply voltage error • The inverter power supply voltage is high or
low.
• Power supply error
• Faulty inverter PC board
P1 Imbalanced power supply • Power supply voltages get significantly
imbalanced among three phases.
• Power supply error (imbalanced
voltages of 2% or more)
• Faulty inverter PC board
• Dead inverter PC board
LC Transmission error (between
inverter PC board and control PC
board) • With the outdoor unit PC board, no
communications are carried out across control
PC board - inverter PC board - fan PC board.
• Broken wire in communication
line
• Faulty control PC board
• Faulty inverter PC board
• Faulty fan PC board
PJ PC board mismatching • Any PC board of specification different from
that of the product is connected.
• PC board of different
specification mounted
P4 Faulty fin thermistor • The fin thermistor gets short-circuited or open. • Faulty fin thermistor