2.39 "P4" Outdoor Unit; P4" Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise Sensor - Daikin RXYQ72 Serivce Manual

Troubleshooting by Indication on the Remote Controller

2.39 "P4" Outdoor Unit:

Temperature Rise Sensor
P4
Remote
Controller
Display
Applicable RXYQ72M, 96M
Models
Method of Resistance of radiation fin thermistor is detected when the compressor is not operating.
Malfunction
Detection
Malfunction When the resistance value of thermistor becomes a value equivalent to open or short circuited
status.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗
170
Malfunction of Inverter Radiating Fin
Malfunction is not decided while the unit operation is continued.
"P4" will be displayed by pressing the inspection button.
Defect of radiator fin temperature sensor
Defect of inverter PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Measure the resistance of
radiation fin thermistor.
Is the
resistance of thermistor
correct?
1
*
YES
Is the resetting possible?
YES
1: Refer to thermistor resistance / temperature characteristics table on P239.
NO
NO
SiUS39-601
Replace inverter PC board.
(Thermistor can not be removed
from inverter PC board)
Replace inverter PC board.
After resetting, restart.
(V2818)
Troubleshooting