Inverter Radiation Fin Temperature Abnormality - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027

2.27 Inverter Radiation Fin Temperature Abnormality

P4
Remote
Controller
Display
Applicable RQYQ-PY1B
Models
Method of Error Resistance of radiation fin thermistor is detected during the compressor stops.
Detection
Error Decision When the resistance value of thermistor becomes a value equivalent to open or short circuited
status.
Conditions
★
Supposed
Causes
Troubleshooting
Service Diagnosis
Error is not decided while the unit operation is continued.
P4
" " will be displayed by pressing the inspection button.
Defective radiation fin thermistor
Defective inverter PCB
Defective inverter compressor
Defective 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?
YES
The INV.
compressor's
insulation resistance
is not more than
100k Ω .
NO
The fan motor's
insulation resistance
is not more than
1M Ω .
NO
Does the error recur
when the power
supply turns ON?
NO
Troubleshooting by Remote Controller
NO
YES
YES
YES
Replace the inverter
PCB.
Replace the INV.
compressor (M1C).
Replace the fan motor.
Replace the INV. PCB.
Continue the operation.
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