Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
128
Service Diagnosis
3.31 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 faulty heat
dissipation.
Supposed
Causes
Actuation of fin thermal (Actuates 180°F or more)
Defective inverter PCB
Defective radiation fin thermistor
High outdoor air temperature
Air suction opening blocked
Troubleshooting
The
radiation fin
temperat
u
re is s
u
pposed to
ha
v
e risen to 1
8
0
°
F or
more.
Is the
connector X111A of the
radiation fin thermistor properly
connected to the o
u
tdoor
u
nit PCB?
Is the error
code "
P4
"
displayed on the remote
controller?
Does the
error code "
L4
"
rec
u
r
w
hen the
u
nit starts
operation?
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
the connector or parts may
b
e damaged.
Caution
Defecti
v
e heat radiation of po
w
er
u
nit
• Air s
u
ction opening
b
locked
• Dirty radiation fin
• High o
u
tdoor air temperat
u
re
Contin
u
e the operation.
Replace the o
u
tdoor
u
nit PCB
(A1P) as
w
ell.
Connect properly.
To "
P4
" tro
ub
leshooting
T
u
rn O
N
the po
w
er s
u
pply,
and then press the remote
controller check
bu
tton once.
YES
N
O
N
O
YES
YES
YES
N
O
N
O
