11
TROUBLESHOOTING
For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units.
The indoor diagnostic display is a combination of flashing LEDs
on the display panel or the front of the unit. Some indoor units
display error codes specifying failure modes in outdoor units.
If possible, always check the diagnostic codes displayed on the
indoor unit first.
The diagnostic codes displayed in the indoor and outdoor units are
listed in the Table 6.
INDOOR UNIT DIAGNOSTIC GUIDES
Table 6—Indoor Unit Diagnostic Guides
OPERATION LAMP
TIMER LAMP
DISPLAY
LED STATUS
☆
1 time
X
E0
Indoor unit EEPROM error
☆
2
times
X
E1
Communication malfunction between indoor and outdoor units
☆
4 times
X
E3
Indoor fan speed has been out of control
☆
5 times
X
E4
Indoor room temperature sensor T1 open circuit or short circuit
☆
6 times
X
E5
Evaporator coil temperature sensor T2 open circuit or short circuit
☆
7 times
X
EC
Refrigerant leakage detection
☆
8 times
X
EE
Water-level alarm malfunction
☆
1 time
O
F0
Current overload protection
☆
2 times
O
F1
Open circuit or short circuit of outdoor ambient temperature sensor T4
☆
3 times
O
F2
Open circuit or short circuit of condenser coil temperature sensor T3
☆
4 times
O
F3
Open circuit or short circuit of Compressor discharge temperature sensor T5
☆
5 times
O
F4
Outdoor unit EEPROM error
☆
6 times
O
F5
Outdoor fan speed has been out of control
☆
7 times
O
F6
T2B sensor error
☆
8 times
O
F7
Lifting-panel communication error
☆
9 times
O
F8
Lifting-panel malfunction
☆
10 times
O
F9
Lifting-panel is not closed
☆
1 time
☆
P0
IPM malfunction
☆
2 times
☆
P1
Over voltage or over low voltage protection
☆
3 times
☆
P2
High temperature protection of compressor top
☆
4 times
☆
P3
Outdoor low temperature protection
☆
5 times
☆
P4
Inverter compressor drive error
☆
6 times
☆
P5
Mode conflict
☆
7 times
☆
P6
Compressor low-pressure protection
☆
8 times
☆
P7
Outdoor IGBT temperature sensor error
O (light) X (off)
☆ (
flash
)
F
or
additional
diagnostic
information
,
refer
to
the
Service Manual.
