P4" Outdoor Unit: Malfunction Of Inverter Radiation Fin Temperature Rise Sensor - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
P4
4.42 " " Outdoor Unit: Malfunction of Inverter Radiation Fin
Temperature Rise Sensor
P4
Remote
Controller
Display
Applicable RTSQ8P~16P (Outdoor Unit), BTSQ20P (Function Unit)
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
Troubleshooting
Malfunction is not decided while the unit operation is continued.
P4
" " will be displayed by pressing the inspection button.
Defect of radiation fin temperature sensor
Defect of inverter PCB
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. *
* Disconnect the connector (X111A) from the fin
Is the thermistor
resistance value
normal?
YES
The INV
compressor's
insulation resistance
is not more than
100kΩ.
NO
The fan motor's
insulation resistance
is not more than
1MΩ.
NO
Does the malfunction
recur when the power
supply turns ON?
NO
Troubleshooting by Indication on the Remote Controller
thermistor, and then check the thermistor.
NO
YES
YES
YES
Replace the inverter
PCB.
Replace the
compressor (M1C).
Replace the fan motor.
Replace the inverter
PCB.
Continue the operation.
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