Daikin RTSQ20PY1 Service Manual page 288

Troubleshooting by Indication on the Remote Controller
Troubleshooting
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277
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
While in monitor mode,
check the unit concerned.
The radiation fin of the
inverter PCB concerned
exceeded a temperature
Turn OFF the power supply,
and then make measurement
of resistance of the radiation
fin thermistor.
Is the thermistor
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?
Refer to "Thermistor Resistance / Temperature Characteristics" table on P.408.
YES
of 93°C.
NO
NO
resistance
normal?
YES
YES
NO
SiBE31-801_C
Faulty radiation fin from the power
unit
• Blocked suction air port
• Stained radiation fin
• High outdoor temperature
Replace the thermistor.
Replace the compressor inverter
PCB.
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
• Airflow obstructed with dirt or
foreign matters
• Damage to fan propellers
• Too high outdoor air
temperature
Troubleshooting