Daikin RQYQ140-180PY1 Service Manual page 150

Troubleshooting by Remote Controller
Troubleshooting
141
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 malfunction
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 temperature
NO
Replace the thermistor.
YES
Replace the compressor 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 temperature
SiBE341001
Troubleshooting