SiSG121917E
Troubleshooting for Outdoor Unit
Part 6 Service Diagnosis
164
Reference
Reference
7.19 Electrical Box Temperature Rise
Error Code
L3
Outdoor Unit LED
Display
A
j
1
i
2
i
3
h
4
i
5
h
Method of Error
Detection
An electrical box temperature rise is detected by checking the radiation fin thermistor with the
compressor off.
Error Decision
Conditions
With the compressor off, the radiation fin temperature is above
A
°C.
The error is cleared when the radiation fin temperature drops below
B
°C.
To cool the electrical components, the outdoor fan starts when the radiation fin temperature
rises above
C
°C and stops when the radiation fin temperature drops below
B
°C.
Supposed
Causes
Defective outdoor fan motor
Short circuit
Defective radiation fin thermistor
Disconnection of connector
Defective outdoor unit PCB
Troubleshooting
Check No.17
Refer to P.176
Check No.19
Refer to P.177
A
(°C)
B
(°C)
C
(°C)
50/65/80 class
90
70
80
90 class
110
75
88
Caution
WARNING
To cool the electrical components, the
outdoor fan starts when the radiation fin
temperature rises above
C
°
C and stops
when the radiation fin temperature drops
below
B
°
C.
(R22957)
YES
NO
YES
NG
NO
OK
NO
YES
Turn off the power. Then, turn on
the power to restart the system.
Check the radiation fin
temperature.
Radiation fin
dirty?
Check No. 19
Check the outdoor fan.
Error again or
outdoor fan activated?
Replace the outdoor unit
PCB (main PCB).
Clean up the radiation fin.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Replace the outdoor fan
motor.
Correct the connectors
and fan motor lead wire.
Replace the outdoor unit
PCB (main PCB).
Above
A
°C?
Check the installation
condition.
Go to
Check No. 17
.
