Hisense 2AMW-42U4RRA, Technical & Service Manual, Page: 67 / 80

Fault
Code
Fault Description Possible Reason of Abnormality How to Deal With Remarks
47
48
49
Outdoor DC fan motor
fault (upper fan motor)
1. The wiring of the down DC fan
motor connect loose;
2. The cord of the down DC fan
motor is failure;
3. The down DC fan motor is
failure;
4. The drive circuit of the down
DC fan motor is failure;
5. The outdoor fan has been
blocked.
1. Reconnect the wiring of the
down DC fan motor;
2. Replace the down DC fan
motor;
3. Replace the down DC fan
motor;
4. Replace the driver board of the
fan motor;
5. Check the outdoor fan and
ensure the outdoor fan can
run normally.
50
53
91
The unit turn off due to
the IPM
board over heating fault
the refrigerant of the unit
is not
enough fault
1. The outdoor ambient is too
high;
2. The speed of the out fan motor
is too low if the fan motor is
AC fan motor;
3. The outdoor unit has been
installed without standard;
4. The supply power is too low.
1. Normally protection;
2. Check the fan capacitor, and
replace the fan capacitor if it is
failure;
3. Reinstalled the outdoor unit
refer to the installation user
manual;
4. Normally protection.
96
14.TROUBLESHOOTING
63
46 IPM and control board
communication fault
1.The cable between the control
board and the driver board is
connected loosely;
2.The cable between the control
board and the driver board
fails;
3.The driver board fails
；
4.The control board fails.
1.Reconnect the cable between
the control board and the
driver board;
2.Replace the communication
cable between the control
board and the driver board;
3.Replace the driver board;
4.Replace the control board.
Too high discharge
temperature fault
1.
2.
The refrigerant of the unit is
not enough;
The refrigerant of the unit is not
enough due to that the
installation pipe is longer.
3.Throttling service fails;
4.The outdoor ambient
temperature is too high.
2.
1.Check the welding point to
confirm whether the unit has
leakage point, and then add
some refrigerant.
Add some refrigerant referring
to the installation user manual;
3.Replace the throttling service
(such as capillary, expansion
valve)
4.Normal protection.
The outdoor DC
fan motor fault
(upper fan motor)
1.
2.
The connecting wiring of the up
DC fan motor is loose;
The cord of the upper DC fan
motor fails;
3.The upper DC fan motor fails;
4.The drive circuit of the upper
DC fan motor fails;
5.The outdoor fan has been
blocked.
1.
2.
Reconnect the wiring of the up
DC fan motor;
Replace the upper DC fan
motor;
3.Replace the upper DC fan motor;
4.Replace the driver board of the
fan motor;
5.Check the outdoor fan and
ensure the outdoor fan can run
normally.
Expansion valve E
(gas pipe) sensor
fault
1. The wiring of the sensor for the
expansion valve E (gas pipe) is
connected loosely;
2. The sensor of the expansion
valve E (gas pipe) fails;
3. The sampling circuit fails.
1. Reconnect the wiring of the
sensor for the expansion valve
E (gas pipe);
2. Replace the sensor for the
expansion valve E (gas pipe);
3. Replace the outdoor control
board.
Expansion valve D
(liquid) pipe sensor
fault
1.The wiring of the sensor for the
expansion valve D (liquid pipe)
is connected loosely;
2.The sensor of the expansion
valve D (liquid pipe) fails;
3.The sampling circuit fails.
1. Reconnect the wiring of the
sensor for the expansion valve
D (liquid pipe);
2. Replace the sensor for the
expansion valve D (liquid pipe);
3. Replace the outdoor control
board.
Lacking of refrigerant
The refrigerant of the unit is not
enough.
Discharge the refrigerant and
charge the refrigerant
referring to the rating label.