Troubleshooting by Remote Controller
SiUS281117
Service Diagnosis
153
2.36 Radiation Fin Temperature Rise
Remote
Controller
Display
L4
Applicable
Models
RZR, RZQ
Method of Error
Detection
Radiation fin temperature is detected by radiation fin thermistor.
Error Decision
Conditions
When the temperature of the inverter radiation fin rises abnormally due to defective heat
dissipation.
Supposed
Causes
Defective radiation fin thermistor
High outdoor air temperature
Blocked suction opening
Dirty radiation fin
Defective outdoor unit inverter PCB
Activation of fin thermal switch
Insufficient cooling of inverter radiation fin
Defective connection of connector
Troubleshooting
The
radiation fin
temperature is supposed to
have risen to 180
°
F
or more.
Is the
connector X111A of
the radiation fin thermistor properly
connected to the outdoor
unit PCB?
Is the
error code "
P4
"
displayed on the remote
controller?
Does the
error code "
L4
"
recur when the unit starts
operation?
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Defective heat radiation of power
unit
• Air suction opening blocked
• Dirty radiation fin
• High outdoor air temperature
Continue the operation.
Replace the outdoor unit PCB
(A1P) as well.
Connect properly.
To "
P4
" troubleshooting
Turn ON the power supply,
and then press the remote
controller check button once.
YES
NO
NO
YES
YES
YES
NO
NO