P4" Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise Sensor; Temperature Rise Sensor - Daikin VRV III RXYQ5-54PY1 Service Manual

Troubleshooting by Indication on the Remote Controller
3.38 "P4" Outdoor Unit:

Temperature Rise Sensor

P4
Remote
Controller
Display
Applicable RXYQ5P~54P
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
Power OFF
Power ON
272
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.
Disconnect the cable from the
compressor, and then check
the compressor for the
insulation resistance.
The insulation
resistance is low (i.e., not more than
100kΩ.)
Disconnect the cable from the
fan, and then check the fan
motor for the insulation
resistance.
The insulation
resistance is low (i.e., not more than
1MΩ.)
Remove and insert the fin
thermistor connector [X111A].
Turn ON the
power supply, and then check
whether or not the malfunction
recurs.
YES
NO
YES
NO
YES
NO
Si34-601A
Replace the
compressor.
Replace the fan motor
Replace the fan driver
PC board.
Replace the inverter
PC board.
End
Troubleshooting