SiEN18-622 Troubleshooting for Outdoor Unit
Troubleshooting 379
7.18 Malfunction of Inverter Radiating Fin Temperature Rise
Remote Control
Display
L4
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Fin temperature is detected by the thermistor of the radiation fin.
Malfunction
Decision
Conditions
When the temperature of the inverter radiation fin increases above 83°C.
Supposed
Causes
Actuation of fin thermal (Actuates above 83°C)
Defect of inverter PCB
Defect of fin thermistor
Troubleshooting
Caution
NO
YES
YES
YES
YES
NO
NO
NO
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The radiator fin
temperature issupposed
to have risen to 83°C
or more.
Is the
connector X111A of the
fin thermistor properly
connected to the outdoor
PCB?
Turn ON the power supply,
and then press the remote
control check button once.
Is the
malfunction code
"P4"displayed on the
remote control?
Does the
malfunction code
"L4" recur when the
unit starts
operation?
Faulty heat radiation of power unit
• Air suction opening blocked
• Dirty radiator fin
• High outdoor temperature
Properly connect.
To "P4" troubleshooting
Replace the outdoor PCB
(A1P) as well.
Continue operation.
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