Daikin VRV III REYQ8PY1, Service Manual

Page: 297 / 452

Troubleshooting by Indication on the Remote Controller Si37-701
286 Troubleshooting
Troubleshooting
YES NO
The radiation
fin of the inverter PC board
concerned exceeded a
temperature of
87˚C.
YES
Faulty radiation from the power unit
• Blocked air suction port
• Stained radiation fin
• High outdoor temperature
NO
Is the
single system applied
to the outdoor
unit?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
While in monitor mode, check
whether the system is right-
hand (control PC board 1) or
left-hand (control PC board 3).
While in monitor mode,
check the outdoor unit
concerned.
Single system Multi system
Is the thermistor
resistance normal?
NO
YES
Replace the thermistor.
Does
the malfunction
recur when the power
supply turns ON to start
the compressor?
NO
Replace the compressor inverter
PC board.
Continue 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
• Air flow obstructed with dirt or
foreign matters
• Damage to fan impellers
• Too high outdoor temperature
Turn OFF the power supply,
and then make measurement
of resistance of the radiation
fin thermistor.
Connect and disconnect
the connector (X111A) for
the fin thermistor, and then
properly connect it.
YES