Daikin VRV EMERION RXYQ-AATJA, Service Manual

Page: 333 / 429

SiUS342303E Troubleshooting by Error Code
Part 6 Service Diagnosis 326
3.50.2 Inverter Radiation Fin Temperature Rise Abnormality (Fan PCB)
Applicable
Models All outdoor unit models
Error Code
L4
Sub code: 06, 07, 18, 19
Method of Error
Detection
Fan PCB radiation fin temperature is detected by the thermistor located inside the fan PCB circuit.
Error Decision
Conditions
Detected temperature exceeds a certain level.
Supposed
Causes
 Radiation fin plate not fixed with screws
 U0 error

Defective fan PCB
 High outdoor air temperature
Troubleshooting
Continue operation.
Field factor. Radiation fin temperature
may have risen due to high outdoor air
temperature.
Turn ON the
power supply, and
then press the ON button.
Does the error
recur?
Replace the fan PCB.
YES
Rectify troubles. Normal?
NO
Check for the cooling
conditions of radiation fin
used to cool the inverter.
(1) Is the radiation fin plate
fixed with screws?
(2) Error code U0 is displayed
on the Error History
screen.
YES
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.