7
7
.
.
T
T
R
R
O
O
U
U
B
B
L
L
E
E
S
S
H
H
O
O
O
O
T
T
I
I
N
N
G
G
DC INVERTER AIR CONDITIONER TECHNICAL& SERVICE MANUAL V3.3
96
Fault
code
Fault Description
Possible Reason of Abnormality
How to Deal With
REMARKS
3.Replace the outdoor control board
supply
models
12
voltage absent phase
1.Three-phase power is abnormal;
2.The outdoor wiring connect wrong;
3.The outdoor control board is failure.
1. Normally protection
2. Check the wiring connection refer to
the wiring diagram;
3. Replace the outdoor control board
Application
of
three-phase
power
supply
models
13
Compressor overheat
protector device
1. The wiring of the overload protector
connect loose.
2. The overload protector is failure .
3. The refrigerant is not enough;
4. The installation pipe is too long than
normal, but not add the enough refrigerant;
5. The expansion valve is failure;
6. The outdoor control board is failure
1. Reconnect the wiring of the overload
protector;
2. Replace the overload protector;
3. Check the welding point of the unit
to confirm whether it is leakage, and
then recharge the refrigerant;
4. Add the refrigerant;
5. Replace expansion valve;
6. Replace the outdoor control board.
14
the high pressure switch
operate or the unit turn off for
high pressure
protection
1.The wiring of the high pressure protector
connect loose;
2.The high pressure protector is failure;
3.The outdoor control board is abnormal;
4. Overload in cooling;
5. Overload in heating.
1.Reconnect the wiring the high
pressure protector;
2. Replace the high pressure protector;
3. Replace the outdoor control board;
4. Please refer to the Note 3;
5. Please refer to the Note 4.
Applied to
models with
high
pressure
switch or
pressure
sensor
15
the low pressure switch
protection or
the unit turn off for low
pressure
protection
1. The low pressure switch is failure;
2.The wiring of the low pressure switch
connect loose;
3.The refrigerant is not enough;
4.The expansion valve failure in heating
mode;
5.The outdoor control board is abnormal.
1. Reconnect the wiring of the low
pressure switch;
2. Replace the low pressure switch;
3.Check the welding point to confirm
whether the unit is leakage, and then
add some refrigerant;
4. Replace the expansion valve;
5. Replace the outdoor control board.
Applied to
models with
low pressure
switch or
pressure
sensor
16
overload protection in cooling
mode
System overload
Please refer to the Note 3.
17
Discharge temperature sensor
fault
1.The wiring of the discharge temperature
sensor connect loose;
2.The discharge temperature sensor is
failure;
3.The sampling circuit is abnormal.
1.Reconnect the wiring of thedischarge
temperature sensor;
2.Replace the discharge temperature
sensor;
3.Replace the outdoor control board.
18
AC voltage is abnormal
1.The AC voltage>275V or <160V.
2.The AC voltage of sampling circuit on the
driver board is abnormally
1. Normally protection, please check
the supply power;
2. Replace the driver board.
MUTI-SPLIT
TYPE ONLY
