Inverter Radiation Fin Temperature Rise Abnormality - Daikin RXYQ-TA Series Service Manual

SiUS341615E

3.45 Inverter Radiation Fin Temperature Rise Abnormality

L4
Error Code
Applicable
All outdoor unit models
Models
Method of Error
Detect temperature of power module of the inverter PCB.
Detection
Error Decision Thermistor located inside the power module of the inverter PCB for compressor and fan motor.
Conditions Cooling tube plate poor heat-exchange.
Supposed
Causes
Troubleshooting
Service Diagnosis
Cooling tube plate not fixed with screws
U0 error
Defective inverter PCB
High outdoor air temperature
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check in Monitor Mode
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 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.
Normal?
YES
Turn ON the
power supply, and
then press the ON button
continuously. Does
the error
recur?
NO
NO
YES
Troubleshooting by Error Code
Rectify troubles.
Replace the inverter PCB.
RXYQ72-120TA: A3P
RXYQ144/168TA: A3P, A6P
Continue operation.
Field factor. Power module temperature
may have risen due to high outdoor air
temperature.
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