Daikin VRVIII-S, Service Manual

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Troubleshooting by Indication on the remote control SiENBE34-703
158 Troubleshooting
3.31 “
L4
” Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise
remote control
Display
L4
Applicable
Models
RXYSQ4~6P
Method of
Malfunction
Detection Fin temperature is detected by the thermistor of the radiation fin.
Malfunction
Decision
Conditions When the temperature of the inverter radiation fin increases above 83°C.
Supposed
Causes
!
Actuation of fin thermal (Actuates above 83°C)
! Defect of inverter PC board (A2P)
! Defect of fin thermistor
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
Faulty heat radiation of power unit
• Air suction opening blocked
• Dirty radiator fin
• High outdoor temperature
Continue operation.
Replace the inverter PC board
assy (A2P) as well.
Properly connect.
Is the connector X111A of
the fin thermistor properly
connected to the outdoor
PCB?
To "P4" troubleshooting
Is the malfunction
code "P4" displayed
on the remote
control?
Does the malfunction code
"L4" recur when the unit
starts operation?
Turn ON the power supply,
and then press the remote
control check button once.
The radiator fin
temperature is
supposed to have risen
to 84
°
C or more.
YES
YES
YES
YES
NO
NO
NO
NO