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
95
Fault
code
Fault Description
Possible Reason of Abnormality
How to Deal With
REMARKS
6
Motor blockage protection
1.Outdoor ambient temperature sensor fault；
2. Outdoor coil temperature sensor fault；
3.Outdoor control board fault.
1.Replace outdoor ambient
temperature sensor；
2.Replace outdoor coil temperature
sensor；
3.Replace Outdoor control board.
Applied to
ON/OFF
air-condition
ers with 2
control
boards
7
The communication fault
between the indoor unit and
outdoor unit
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.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
8
Phase current imbalance
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.Normally protection;
2.Reconnect the wire refer to thewiring
diagram;
3.Replace the AC contactor;
4.Replace the compressor.
Application
of
three-phase
power
supply
models
9
U phase current fault
1.Compressor U phase power cord is fault or
connect wrong;
2.Outdoor control board is fault;
3.The Compressor is fault
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.
Application
of
three-phase
power
supply
models
10
V phase current 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.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.
Application
of
three-phase
power
supply
models
11
phase wrong failure
1.Three-phase power is abnormal;
2.The outdoor wiring connect wrong;
3. The outdoor control board is failure
1.Normally protection, please check
the supply power
2.Check the wiring connection refer to
the wiring diagram;
Application
of
three-phase
power
