SiUS12-928_B
Troubleshooting for Outdoor Unit
Service Diagnosis
172
6.12 Discharge Pipe Temperature Control
Remote
Controller
Display
F3
Outdoor Unit LED
Display
A
j
1
i
2
h
3
i
4
h
Method of
Malfunction
Detection
Detected by the discharge pipe thermistor
Malfunction
Decision
Conditions
If the temperature detected by the discharge pipe thermistor rises above
A
, the compressor
stops.
The error is cleared when the discharge pipe temperature is dropped below
B
.
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Defective discharge pipe thermistor
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Defective outdoor electronic expansion valve or coil
Refrigerant shortage
Defective four
-
way valve
Water mixed in refrigerant
Defective stop valve
Defective outdoor unit PCB
Troubleshooting
Check No.01
Refer to P.191
Check No.12
Refer to P.194
Check No.14
Refer to P.195
A
B
248°F(120°C)
224.6°F(107°C)
(R152
8
6)
Caution
N
G
OK
OK
OK
N
G
N
G
*
Discharge pipe thermistor
*
O
u
tdoor heat exchanger thermistor
*
O
u
tdoor temperat
u
re thermistor
*
Refrigerant shortage
*
Fo
u
r-
w
ay
v
al
v
e
*
W
ater mixed
*
Stop
v
al
v
e
Check No. 01
Check the thermistors.
Check No. 14
Check the refrigerant line.
Check No. 12
Check the o
u
tdoor electronic
expansion
v
al
v
e.
Replace the defecti
v
e
thermistor.
Replace the o
u
tdoor
electronic expansion
v
al
v
e
or the coil.
Refer to the refrigerant line
check proced
u
re.
Replace the o
u
tdoor
u
nit
PCB.
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
connectors, or parts may
b
e damaged.
