Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
134
Service Diagnosis
3.36 Radiation Fin Thermistor Abnormality
Remote
Controller
Display
P4
Applicable
Models
RZR, RZQ
Method of Error
Detection
Detection by open or short circuit of the radiation fin thermistor during the compressor stops
operating.
Error Decision
Conditions
When open or short circuit of the radiation fin thermistor is detected during the compressor
stops operating
Supposed
Causes
Defective radiation fin temperature sensor
Defective outdoor unit PCB (A1P)
External factor (Noise, etc.)
Troubleshooting
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.
Replace the o
u
tdoor
u
nit PCB (A1P).
N
O
Disconnect the ca
b
le from the
compressor, and then check
the compressor for the
ins
u
lation resistance.
Remo
v
e and insert the radiation
fin thermistor connector (X111A).
Caution
Po
w
er OFF
YES
Po
w
er O
N
N
O
YES
Replace the
compressor.
Contin
u
e the
operation.
The
ins
u
lation resistance
is lo
w
(i.e., not more than
100
κΩ
.)
T
u
rn O
N
the po
w
er s
u
pply,
and then check
w
hether or
not the error rec
u
rs.
