P4 Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise Sensor - Daikin RXYQ96PYDN Service Manual

Troubleshooting by Indication on the Remote Controller
P4
3.42 Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise Sensor
P4
Remote
Controller
Display
Applicable
RXYQ72P~240PYDN, PTJU
Models REYQ72P~240PYDN, PTJU
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
408
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
Faulty inverter compressor
Faulty fan motor
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Measure resistance value of
the radiation fin thermistor.
Is the
thermistor resistance
value normal?
The INV
compressor's insulation
resistance is not more
than 100kΩ.
The fan
motor's insulation
resistance is not more
than 1MΩ.
Does the
malfunction recur when
the power supply
turns ON?
*
* Disconnect the connector (X111A) from the fin
thermistor, and then check the thermistor.
NO
YES
YES
NO
YES
NO
YES
NO
SiUS34-801A_b
Replace the inverter PC
board.
Replace the
compressor (M1C).
Replace the fan motor.
Replace the inverter PC
board.
Continue operation.
Troubleshooting