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

Troubleshooting by Remote Controller

2.21 Inverter Radiation Fin Temperature Rise

L4
Remote
Controller
Display
Applicable RQYQ-PY1B
Models
Method of Error Radiation of compressor inverter PCB.
Fin temperature is detected by the radiation fin thermistor.
Detection
Error Decision When the temperature of the inverter radiation fin increases above 87°C.
Conditions
Supposed
Causes
Troubleshooting
136
Actuation of fin thermal (Actuates above 87°C)
Defective inverter PCB
Defective radiation fin thermistor
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The radiation fin of the inverter
PCB concerned exceeded a
temperature of 87°C.
NO
Turn OFF the power supply,
and then make measurement
of resistance of the radiation
fin thermistor.
Is the thermistor
resistance normal?
YES
Connect and disconnect
the connector (X111A) for
the fin thermistor, and
then properly connect it.
Does the
error recur when the
power supply turns
ON to start the
compressor?
NO
YES
Faulty radiation from the power unit
• Blocked air suction port
• Stained radiation fin
• High outdoor air temperature
NO
Replace the thermistor.
YES
Replace the inverter PCB.
Continue the operation.
It is supposed that the radiation
fin temperature became high due
to some field factors. In this
connection, check the following
points:
• Stained radiation fin
• Airflow obstructed with dirt or
foreign matters
• Damage to fan impellers
• Too high outdoor air
temperature
SiBE341027
Service Diagnosis