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T
R
O
U
B
L
E
S
T
R
O
U
B
L
E
S
1
4
.
1
4
.
Fault
Fault Description
code
The communication fault
7
between the indoor unit
and outdoor unit
8
Phase current imbalance
9
U phase current fault
10
V phase current fault
11
phase wrong failure
12
voltage absent phase
Compressor overheat
13
protector device
H
O
O
T
I
N
G
H
O
O
T
I
N
G
Possible Reason of Abnormality
1.The connection cable connect
wrong between the indoor unit and
outdoor unit;
2.The communication cable connect
loose;
3.The communication cable is fault;
4.The indoor control board is fault;
5.The outdoor control board is fault;
6.Communication circuit fuse open;
7.The specification of communication
cable is incorrect.
1.The supply voltage fluctuates more
than 4%;
2.The compressor power cord
connect loose;
3.The AC contactor is fault;
4.The compressor motor fault.
1.Compressor U phase power cord is
fault or connect wrong;
2.Outdoor control board is fault;
3.The Compressor is fault
1.Compressor V phase power cord is
fault or connect wrong;
2.The outdoor control board is fault;
3.The compressor is fault
1.Three-phase power is abnormal;
2.The outdoor wiring connect wrong;
3. The outdoor control board is failure
1.Three-phase power is abnormal;
2.The outdoor wiring connect wrong;
3.The outdoor control board is failure.
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
How to Deal With
1.Reconnect the connection cable
refer to the wiring diagram;
2.Reconnect the communication
cable;
3.Replace the communication cable;
4.Replace the indoor control board;
5.Replace the outdoor control board;
6.Check the communication circuit,
adjust the DIP switch and the
short-circuit fuse.
7.Choose suitable communication
cable refer to the user manual
1.Normally protection;
2.Reconnect the wire refer to the
wiring diagram;
3.Replace the AC contactor;
4.Replace the compressor.
1.Replace the U phase power cord or
reconnect the U phase power cord
refer to the wiring diagram;
2.Replace the outdoor control board;
3.Replace the compressor.
1.Replace the V phase power cord or
reconnect the V phase power cord
refer to the wiring diagram;
2.Replace the outdoor control board;
3.Replace the compressor.
1.Normally protection, please check
the supply power
2.Check the wiring connection refer to
the wiring diagram;
3.Replace the outdoor control board
1. Normally protection
2. Check the wiring connection refer
to the wiring diagram;
3. Replace the outdoor control board
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.
125
REMARKS
Application
of
3-phase
power
supply
models
Application
of
3-phase
power
supply
models
Application
of
3-phase
power
supply
models
Application
of
3-phase
power
supply
models
Application
of
3-phase
power
supply
models
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