5
TROUBLESHOOTING
Fault codes
The following is the fault code table of outdoor units.
Table 1 Outdoor fault code
Fault
code
Fault
d
escription
Possible
r
eason
s for
a
bnormality
How to
d
eal
w
ith
R
emarks
1
Outdoor ambient
temperature sensor
fault
1.The outdoor ambient temperature
sensor is connected loosely;
2.The outdoor ambient temperature
sensor fails to work;
3.The sampling circuit fails.
1.Reconnect the outdoor
ambient temperature sensor;
2.Replace the outdoor ambient
temperature sensor
components;
3.Replace the outdoor control
board components.
2
Outdoor coil
temperature sensor
fault
1.The outdoor coil temperature
sensor is connected loosely;
2.The outdoor coil temperature
sensor fails to work;
3.The sampling circuit fails.
1.Reconnect the outdoor coil
temperature sensor;
2.Replace the outdoor coil
temperature sensor
components;
3.Replace the outdoor control
board components.
3 The unit over-current
turn off fault
1. Control board current sampling
circuit fails;
2. The current is over high because
the supply voltage is too low;
3. The compressor is blocked;
4. Overload in cooling mode;
5. Overload in heating mode.
1. Replace the electrical control
board components;
2. Normally protection
3. Replace the compressor
4. Please see the Note 3
5. Please see the Note 4
4 EEprom Data error
1.EE components fails;
2.EE components control circuit
fails;
3.EE components are inserted
incorrectly.
1.Replace the EE components;
2.Replace the outdoor control
board components;
3.Reassembly the EE
components.
5
Cooling freezing
protection (the indoor
coil temperature is too
low) or heating
overload (indoor coil
temperature is too
high)
1.The indoor unit can not blow air
normally;
2.The room temperature is too low in
cooling mode or the room
temperature is too high in heating;
3.The filter is dirty;
4.The duct resistance is too high to
result in low air flow;
5.The setting fan speed is too low;
6.The indoor unit is not installed in
accordance with the installation
standards, and the air inlet is too
close to the air outlet .
1.Check whether the indoor fan,
indoor fan motor and
evaporator work normally;
2.Normal protection;
3.Clean the filter;
4.Check the volume control
valve, duct length etc.;
5.Set the speed with high speed;
6.Reinstall the indoor unit
referring to the user manual to
change the distance between
the indoor unit and the wall or
ceiling.
7
The communication
fault between the
indoor unit and
outdoor unit
1.
2.
The connection cable is connected
improperly between the indoor unit
and outdoor unit;
The communication cable is
connected loosely;
3.The communication cable fails;
4.The indoor control board fails;
5.The outdoor control board fails;
6.Communication circuit fuse open;
7.The specification of
communication cable is incorrect.
1.
2.
3.
Reconnect the connection
cable referring to the wiring
diagram;
Reconnect the communication
cable;
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
referring to the user manual
