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
ON/OFF UNITARY AIR CONDITIONER TECHNICAL& SERVICE MANUAL V5.0
98
Fault
code
Fault Description
Possible Reason of Abnormality
How to Deal With
REMARKS
as capillary, expansion valve)
4. Normally protection.
48
the outdoor DC fan motor fault
(upper fan motor)
1.The wiring of the up DC fan motor connect
loose;
2. The cord of the up DC fan motor is failure;
3.The up DC fan motor is failure;
4. The drive circuit of the up DC fan motor is
failure;
5. The outdoor fan has been blocked.
1.Reconnect the wiring of the up DC
fan motor;
2.Replace the up DC fan motor;
3. Replace the up 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.
48-1
the outdoor
upper DC fan
motor Locked rotor fault
1.The fan motor motor rotation blockage;
2. The fan motor is failure;
3.The outdoor control board is failure;
4. The driver board is failure;
1. Remove the fan motor locked-rotor
sundry, recover motor operating
conditions;
2. Replace the upper DC fan motor;
3. Replace the outdoor control board ;
4 .Replace the driver board .
VRF
48-2
the outdoor upper DC fan motor
stall fault
1. The fan motor is failure;
2.The outdoor control board is failure;
3. The driver board is failure;
1. Replace the upper fan motor;
2. Replace the outdoor control board ;
3 .Replace the driver board .
VRF
49
the outdoor DC fan motor fault
(down 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 DCfan 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
ensurethe outdoor fan can run
normally.
49-1
the outdoor
lower DC fan
motor Locked rotor fault
1.The fan motor motor rotation blockage;
2. The fan motor is failure;
3.The outdoor control board is failure;
4. The driver board is failure;
1. Remove the fan motor locked-rotor
sundry, recover motor operating
conditions;
2. Replace the lower DC fan motor;
3. Replace the outdoor control board ;
4 .Replace the driver board .
VRF
49-2
he outdoor
lower DC fan motor
stall fault
1. The fan motor is failure;
2.The outdoor control board is failure;
3. The driver board is failure;
1. Replace thelower fan motor;
2. Replace the outdoor control board ;
3 .Replace the driver board .
VRF
