Troubleshooting for Outdoor Unit
SiSG121917E
165
Part 6 Service Diagnosis
Reference
7.20 Radiation Fin Temperature Rise
Error Code
L4
Outdoor Unit LED
Display
A
j
1
h
2
h
3
h
4
i
5
h
Method of Error
Detection
A radiation fin temperature rise is detected by checking the radiation fin temperature with the
compressor on.
Error Decision
Conditions
The radiation fin temperature with the compressor on is above
A
°C.
The error is cleared when the radiation fin temperature drops below
B
°C
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Silicone grease is not applied properly on the radiation fin after replacing the outdoor unit
PCB.
Troubleshooting
Check No.17
Refer to P.176
A
(°C)
B
(°C)
50/65/80 class
90
84
90 class
100
90
Caution
T
u
rn off the po
w
er. Then, t
u
rn on
the po
w
er to restart the system.
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.
(R22540)
N
O
N
G
OK
N
O
YES
Check the radiation fin
temperat
u
re.
N
O
YES
YES
A
b
o
v
e
A
°C?
Check No. 19
Check the o
u
tdoor fan.
Error displayed again?
Has the PCB
b
een
replaced?
Check if silicone grease is
applied properly on the
radiation fin. If not, apply
the silicone grease.
Replace the o
u
tdoor
u
nit
PCB (main PCB).
Replace the o
u
tdoor fan
motor.
Correct the connectors and
fan motor leads.
Replace the o
u
tdoor
u
nit
PCB (main PCB).
YES
N
O
Radiation fin dirty?
Clean
u
p the radiation fin.
Check the installation
condition.
Go to
Check No. 17
.
