Troubleshooting by Indication on the Remote Controller
SiUS30-1301
200
Service Diagnosis
3.29 Inverter Radiation Fin Temperature Rise Abnormality
Error Code
L4
Applicable
Models
RWEYQ72P, 84P
Method of Error
Detection
Fin temperature is detected by the thermistor of the radiation fin.
Error Decision
Conditions
When the temperature of the inverter radiation fin increases 188.6°F or more
Supposed
Causes
Actuation of radiation fin thermal (Actuates 188.6°F or more)
Defective inverter PCB
Defective radiation fin thermistor
Troubleshooting
Is the
thermistor
resistance normal?
YES
NO
YES
Replace the inverter PCB.
YES
NO
The
radiation
fin of the
inverter PCB
concerned exceeded a
temperature of
188.6˚F.
NO
Error
is displayed
again when the
power supply turns ON
to start the
compressor?
Turn OFF the power
supply, and then make
measurement of
resistance of the
radiation fin thermistor.
Connect and disconnect
the connector (
∗
1) for
the radiation fin
thermistor, and then
properly connect it.
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 air
temperature
Defective radiation from the
power unit
• Blocked air suction port
• Stained radiation fin
• High outdoor air temperature
Replace the thermistor.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 11