15
TROUBLESHOOTING
This unit has on- board diagnostics. Error codes appear on the LED display on the front panel of the indoor unit in place of the temperature
display. Error codes are also displayed on the outdoor unit microprocessor board with colored LED lights. The table below explains the error
codes for both units.
Table 16—Diagnostic Codes
Malfunction
Display of
indoor unit
Display of lamp (the times of blinking)
Indoor
Outdoor
R
C
H
Y
R
G
Anti-freezing protection
E2
2
3
Block or Low pressure of refrigerant system
E3
3
9
Compressor exhaust high temperature protection
E4
4
7
AC over-current protection
E5
5
5
Communication failure between indoor unit and outdoor unit
E6
6
O/U
Anti-high temperature protection
E8
8
6
H4
4
6
No feedback of indoor fan motor
H6
11
Jumper cap malfunction protection
C5
15
Indoor unit and outdoor unit doesn't match
LP
19
16
Outdoor DC fan motor malfunction
L3
23
14
Power protection
L9
20
9
Gathering refrigerant
Fo
1
1
Indoor ambient sensor open or short circuit
F1
1
Indoor tube sensor open or short circuit
F2
2
Outdoor ambient sensor open or short circuit
F3
3
6
Outdoor tube sensor open or short circuit
F4
4
5
Exhaust sensor open or short circuit
F5
5
7
Overload limit / drop frequency
F6
6
3
Over current limit / drop frequency
F8
8
1
High exhaust temperature limit / drop frequency
F9
9
2
Refrigerant leakage protection
F0
10
9
Anti-freezing limit / drop frequency
FH
2
2
4
Defrosting
H1
1
2
Compressor overload protection
H3
3
8
IPM protection
H5
5
4
Module temperature is too high
H5
5
10
PFC protection
HC
6
14
Loading EEPROM malfunction
EE
15
11
High PN voltage protection
PH
11
13
Low PN voltage protection
PL
21
12
4-way valve reversal abnormal
U7
20
DRED1 / DRED2 / DRED3
d1/d2/d3
Compressor Min frequence in test state
P0
Compressor rated frequence in test state
P1
Compressor maximum frequence in test state
P2
Compressor intermediate frequence in test state
P3
Compressor is running(normal)
1
The temperature for turning on the unit is reached (normal)
8
Frequency limiting (module temperature)
EU
6
6
11
Frequency limiting (power)
LU
24
13
Notes:
R(Indoor)--Running
C--Cooling
H--Heating
Y--Yellow
R(Outdoor)--Red
G--Green
O/U--OFF or Unblink
The display difference between Fo and F0 is 'o' is the bottom part of figure 8