Daikin VRVIII-S, Service Manual

Page: 165 / 266

Troubleshooting by Indication on the remote control SiENBE34-703
154 Troubleshooting
3.27 “
J9
” Outdoor Unit: Malfunction of Subcooling Heat
Exchanger Gas Pipe Thermistor (R4T)
remote control
Display
J9
Applicable
Models
RXYSQ4~6P
Method of
Malfunction
Detection Malfunction is detected according to the temperature detected by subcooling heat exchanger
gas pipe thermistor.
Malfunction
Decision
Conditions When the subcooling heat exchanger gas pipe thermistor is short circuited or open.
Supposed
Causes
!
Faulty subcooling heat exchanger gas pipe thermistor (R4T)
! Faulty outdoor unit PC board
Troubleshooting
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P225.
(V3075)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
Is
the
resistance
measured after
removing the thermistor (R4T)
from outdoor unit PC board
normal?
(3.5 k
Ω
to 360 k
Ω
)
Replace outdoor unit PC board
(A1P).
Connect connector and operate
unit again.
Replace thermistor (R4T).
Is
the
connector for
subcooling heat
exchanger gas pipe
thermistor connected to
X12A of outdoor unit
PC board
(A1P)?
NO
NO
YES
YES