Daikin RXYQ96PYDN Service Manual page 392

SiUS34-801A_b
H9
3.24 Outdoor Unit: Malfunction of Thermistor (R1T) for
Outdoor Air
H9
Remote
Controller
Display
Applicable
RXYQ72P~240PYDN, PTJU
Models REYQ72P~240PYDN, PTJU
Method of
Temperature detected by the outdoor air thermistor.
Malfunction
Detection
Malfunction
When the outside air temperature thermistor has short circuit or open circuit.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗ Refer to the Thermistor Resistance / Temperature Characteristics table on Page 523.
Troubleshooting
Defective thermistor connection
Defect of thermistor (R1T) for outdoor air
Defect of outdoor unit PC board (A1P)
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Confirm which thermistor is
abnormal using outdoor unit
"monitor mode".
(Refer to P334~335)
Connector is
connected to X18A of
outdoor PC board
(A1P).
YES
Resistance
is normal when
measured after
disconnecting the thermistor
(R1T) from the outdoor
unit PC board.
(1.8kΩ to
800kΩ)
YES
Troubleshooting by Indication on the Remote Controller
NO
NO
Connect the connector and turn on
again.
Replace the thermistor (R1T)
Replace outdoor unit PC board
(A1P).
(V3070)
377