Daikin REYQ8-48PY1B, Service Manual

Page: 318 / 477

Troubleshooting by Indication on the Remote Controller SiBE37-701_B
307 Troubleshooting
3.29
“
J3
”
Outdoor Unit: Malfunction of Discharge Pipe
Thermistor (R31T, R32T, R33T)
Remote
Controller
Display
J3
Applicable
Models REYQ8P~48P
Method of
Malfunction
Detection Malfunction is detected from the temperature detected by discharge pipe temperature
thermistor.
Malfunction
Decision
Conditions When a short circuit or an open circuit in the discharge pipe temperature thermistor is detected.
Supposed
Causes
„
Defect of thermistor (R31T, R32T, R33T) for outdoor unit discharge pipe
„
Defect of outdoor unit PCB (A1P)
„
Defect of thermistor connection
Troubleshooting
The alarm indicator is displayed when the fan is being used also.
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P450.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Connector is
connected to X29A
of outdoor unit PCB
(A1P).
NO
Connect the connector and turn on
again.
Confirm which discharge
thermistor is abnormal using
outdoor unit "monitor mode".
(Refer to P.255~P.256)
Resistance is normal
when measured after
disconnecting the
thermistor R31, 32T or
R33T from the outdoor
unit PCB. (2.5k
Ω
to
1.3k
Ω
)
YES
NO
YES
Replace the thermistor (R31, 32T
or R33T)
Replace the outdoor unit PCB
(A1P).