Daikin VRV III REYQ8PY1, Service Manual

Page: 288 / 452

Si37-701 Troubleshooting by Indication on the Remote Controller
Troubleshooting 277
3.31
“
J8
”
Outdoor Unit: Malfunction of Liquid Pipe Thermistor 2
(R7T or R15T)
Remote
Controller
Display
J8
Applicable
Models REYQ8P~48P
Method of
Malfunction
Detection Malfunction is detected according to the temperature detected by liquid pipe thermistor.
Malfunction
Decision
Conditions When the liquid pipe thermistor is short circuited or open.
Supposed
Causes
„
Faulty liquid pipe thermistor 2 (R7T or R15T)
„
Faulty outdoor unit PC board
„
Defect of thermistor connection
Troubleshooting
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P417.
(V3075)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is the
resistance
measured after
removing the thermistor
(R7T or R15T) from outdoor
unit PC board normal?
(1.8k
Ω
to
800k
Ω
)
Replace outdoor unit PC board
(A1P).
Connect the connector and
operate unit again.
NO
NO
Replace thermistor (R7T or R15T).
YES
YES
Is
the connector
for liquid pipe
thermistor connected to
X30A on outdoor
unit PC board
(A1P)?
Confirm which thermistor is
abnormal using outdoor unit
"monitor mode".
(Refer to P226~227)