Daikin RXYQ-TA Series, Руководство по обслуживанию, Страница: 257 / 337

SiUS341615E Troubleshooting by Error Code
Service Diagnosis 244
3.45 Inverter Radiation Fin Temperature Rise Abnormality
Error Code
L4
Applicable
Models
All outdoor unit models
Method of Error
Detection
Detect temperature of power module of the inverter PCB.
Error Decision
Conditions
Thermistor located inside the power module of the inverter PCB for compressor and fan motor.
Cooling tube plate poor heat-exchange.
Supposed
Causes
„
Cooling tube plate not fixed with screws
„
U0 error
„
Defective inverter PCB
„
High outdoor air temperature
Troubleshooting
Continue operation.
Field factor. Power module temperature
may have risen due to high outdoor air
temperature.
Turn ON the
power supply, and
then press the ON button
continuously. Does
the error
recur?
Replace the inverter PCB.
RXYQ72-120TA: A3P
RXYQ144/168TA: A3P, A6P
YES
Rectify troubles.
Normal?
NO
NO
Check for the cooling
conditions of cooling tube
used to cool the inverter.
(1)Is the cooling tube plate
fixed with screws?
(2)Error code U0 is displayed
on the Error History
screen.
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
12/14 ton classes are
equipped with 2 compressors.
Check for the compressor 1
or 2 applicable to the error
code
L4 while in monitor
mode of the outdoor unit
PCB.
Check in Monitor Mode