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Troubleshooting
For 36K~48K Units
NO.
Malfunction
Communication malfunction between indoor
1
and outdoor units.
Open or short circuit of T1 temperature
2
sensor
Open or short circuit of T2 temperature
3
sensor
Open or short circuit of T2B temperature
4
sensor
5
Indoor EEPROM malfunction
6
Indoor fan speed is out of control
7
Refrigerant Leakage Detection
8
Outdoor unit malfunction
9
Full-water malfunction
Communication malfunction between main
10
PCB and up-down panel PCB
11
Up-down panel malfunction
12
Up-down panel is not closed
2.3 Outdoor unit malfunction
For YN012GMFI16RUD and YN018GMFI18RUD:
No.
Problems
1
standby for normal
2
Operation normally
3
IPM malfunction or IGBT over-strong current protection
4
Over voltage or too low voltage protection
5
Inverter compressor drive error
6
Inverter compressor drive error
Communication malfunction between compressor driver board and
7
outdoor main board
8
Compressor driver board EEPROM malfunction
120
Defrosting
lamp
X
X
X
X
☆
☆
☆
X
X
☆
☆
☆
O (on)
X(off) ☆(flash at 5Hz) ◎(flash at 0.5Hz)
F0,F1,F2 is only available for super-slim cassette
O（light）
X（off）
Alarm
Running lamp
lamp
X
X
X
☆
X
☆
X
☆
X
X
X
☆
☆
O
◎
X
X
☆
☆
☆
☆
X
X
☆
Green
Red
O
X
X
O
X
☆
O
O
X
☆
☆
O
☆
☆
O
☆
☆（2.5Hz flash）
Timer
Display(digital
lamp
tube)
E1
☆
X
E2
X
E3
X
E4
X
E7
X
E8
X
EC
X
Ed
X
EE
X
F0
☆
F1
O
F2
IU display
P0
P1
P4
P4
P4
E5
Electrical Control System
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