Service manual

SiUS28-902_a Troubleshooting by Indication on the Remote Controller
Troubleshooting 122
3.29 “L4” Outdoor Unit: Malfunction of Inverter Radiating Fin
Temperature Rise
Remote
Controller
Display
L4
Applicable
Models
RZQ18~30PVJU
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 180°F.
Supposed
Causes
 Actuation of fin thermal (Actuates above 180°F)
 Defect of inverter P.C.B.
 Defect of fin thermistor
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Faulty heat radiation of power unit
• Air suction opening blocked
• Dirty radiator fin
• High outdoor temperature
Continue operation.
NO
YES
YES
Replace the outdoor P.C.B. (A1P)
as well.
YES
The radiator
fin temperature is supposed
to have risen to 180°F
or more.
Connect properly.
YES
NO
Is the
connector X111A of
the fin thermistor properly
connected to the
outdoor P.C.B.?
To "P4" troubleshooting
Is the
malfunction code "P4"
displayed on the remote
controller?
Does the
malfunction code "
L4"
recur when the unit starts
operation?
NO
NO
Turn ON the power supply,
and then press the remote
controller check button once.