Troubleshooting by Remote Controller
SiBE341027
136
Service Diagnosis
2.21 Inverter Radiation Fin Temperature Rise
Remote
Controller
Display
L4
Applicable
Models
RQYQ-PY1B
Method of Error
Detection
Radiation of compressor inverter PCB.
Fin temperature is detected by the radiation fin thermistor.
Error Decision
Conditions
When the temperature of the inverter radiation fin increases above 87°C.
Supposed
Causes
Actuation of fin thermal (Actuates above 87°C)
Defective inverter PCB
Defective radiation fin thermistor
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
YES
Faulty radiation from the power unit
• Blocked air suction port
• Stained radiation fin
• High outdoor air temperature
NO
NO
YES
NO
YES
The radiation fin of the inverter
PCB concerned exceeded a
temperature of 87°C.
Turn OFF the power supply,
and then make measurement
of resistance of the radiation
fin thermistor.
Replace the thermistor.
Is the thermistor
resistance normal?
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?
Replace the inverter PCB.
Continue the operation.
z
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
