Daikin RXYQ96PYDN, Service Manual

Page: 398 / 567

SiUS34-801A_b Troubleshooting by Indication on the Remote Controller
Troubleshooting 383
3.29
J6
Outdoor Unit: Malfunction of Thermistor (R4T or R12T)
for Outdoor Unit Heat Exchanger
Remote
Controller
Display
J6
Applicable
Models
RXYQ72P~240PYDN, PTJU
REYQ72P~240PYDN, PTJU
Method of
Malfunction
Detection
Temperature detected by the heat exchanger thermistor.
Malfunction
Decision
Conditions When a short circuit or an open circuit in the heat exchange thermistor is detected.
Supposed
Causes
Defect of thermistor (R4T or R12T) for outdoor unit coil
Defect of outdoor unit PC board (A1P)
Defect of thermistor connection
Troubleshooting
∗
Refer to the Thermistor Resistance / Temperature Characteristics table on Page 523.
(V3074)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Resistance
is normal when
measured after
disconnecting the thermistor
R4T or R12T from the
indoor unit PC
board. (1.8k
Ω
to 800k
Ω
)
Replace outdoor unit PC board
(A1P).
Connect the connector and turn on
again.
NO
NO
Replace the thermistor R4T or
R12T.
YES
YES
Connector
is connected to X30A
of outdoor unit PC
board (A1P).
Confirm which thermistor is
abnormal using outdoor unit
"monitor mode".
(Refer to P334~335)