Daikin RXYQ96PYDN Service Manual page 409

Troubleshooting by Indication on the Remote Controller
Troubleshooting
394
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
YES
single system applied
to the outdoor
Single system
While in monitor mode, check
whether the system is right-
hand (control PC board 1) or
left-hand (control PC board 3).
The radiation
fin of the inverter PC board
concerned exceeded a
temperature of
Turn OFF the power supply,
and then make measurement
of resistance of the radiation
fin thermistor.
Is the thermistor
resistance normal?
Connect and disconnect
the connector (X111A) for
the fin thermistor, and then
properly connect it.
the malfunction
recur when the power
supply turns ON to start
the compressor?
Is the
NO
unit?
Multi system
While in monitor mode,
check the outdoor unit
concerned.
YES
188.6˚F.
NO
NO
YES
Does
YES
NO
SiUS34-801A_b
Faulty radiation from the power unit
• Blocked air suction port
• Stained radiation fin
• High outdoor temperature
Replace the thermistor.
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
Troubleshooting