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9. Troubleshooting
Indoor unit error code explanation:
9.1
PROFESSIONAL series +HEAT R series:
Display
Operation lamp flash times
E0
E1
E3
E4
E5
F1
F2
F3
F4
F5
F6
P0
P1
P4
P5
P6
Light Commercial series(Except Console)
NO.
1
Open or short circuit of T1 temperature sensor
2
Open or short circuit of T2 temperature sensor
3
Indoor / outdoor units communication error
Full-water malfunction
4
5
Indoor EEPROM malfunction
6
IPM module protection
Open or short circuit of T3 or T4 temperature sensor or
7
Outdoor EEPROM malfunction
8
Outdoor fan speed has been out of control
9
Indoor fan speed has been out of control
10
Voltage protection
12
Outdoor unit over-current protection
13
Inverter compressor drive protection
14
Mode conflict
1
2
4
5
6
2
3
4
5
6
7
1
2
5
6
7
（light） X
O
MALFUNCTION
☆ Flash(at 2.5Hz)
Note: Digital display is only available for A5 duct type.
Timer lamp
X
Indoor EEPROM malfunction
X
Indoor / outdoor units communication error
X
Indoor fan speed has been out of control
X
Open or short circuit of T1 temperature sensor
X
Open or short circuit of T2 temperature sensor
O
Open or short circuit of T4 temperature sensor
O
Open or short circuit of T3 temperature sensor
O
Open or short circuit of T5 temperature sensor
O
Outdoor EEPROM parameter error
O
Outdoor fan speed out of control
O
Open or short circuit of T2B temperature sensor
☆
IPM module protection
☆
Voltage protection
☆
Inverter compressor drive protection
☆
Mode conflict
Low
pressure
☆
FS4MIF-360AE2)
（off）
☆ （flash）
RUN
Timer
☆
X
X
X
☆
☆
☆
☆
☆
☆
☆
☆
☆
◎
Flash(at 0.5Hz)
31
Failure
protection(Just
DEF
Alarm
X
X
X
☆
X
X
☆
X
X
☆
X
X
☆
X
X
X
X
O
O
X
X
☆
O
X
O
O
X
O
X
O
☆
☆
X
◎
X
X
X
O
O
O light
X（off）
matching
with
DISPLAY
DIGITAL TUBE
E0
E1
E2
E3
E4
E5
E6
E7
F5
P0
P2
P4
P5
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