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
101
Fault
code
Fault Description
Possible Reason of Abnormality
How to Deal With
REMARKS
50
Expansion valve E
temperature sensor fault
1. The wiring of the sensor connect loose;
2.The sensor of the expansion valve Eis
failure;
3. The sampling circuit is abnormally
1. Reconnect the wiring of the sensor;
2. Replace the sensor for the
expansion valve E;
3. Replace the outdoor control board.
FOR Branch
Box
63
Current sensor fault
1. The wiring of the current sensor connect
loose;
2.The current sensor is failure;
3. The sampling circuit is abnormally
1. Reconnect the wiring of the sensor;
2. Replace the current sensor;
3. Replace the outdoor control board.
Application
of
three-phase
power
supply
ON/OFF
unitary
models
66
Radiator temperature sensor
fault
1. The sensor connect is loose;
2.The current sensor is failure;
3. The sampling circuit is abnormally
1. Reconnect the wiring ;
2. Replace the temperature sensor;
3. Replace the outdoor control board.
67
Radiator temperature protect
91
The unit turn off due to the IPM
board over heating 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.
92
the ratio of the discharge
pressure than the suction
pressure is too large
1.The filter of the expansion valve is dirty;
2. The difference between the indoor room
temperature and the outdoor ambient
temperature is too large;
3. The refrigerant of the unit is not enough;
4.;The expansion is failure or the capillary is
failure
5. The outdoor ambient temperature is too
low in heating mode
1. Replace the expansion valve;
2. Normally protection;
3.Check the welding point of the unit to
confirm whether it exist leakage point,
and then add some refrigerant;
4.Replace the expansion valve or the
capillary;
5. Please let the unit operates within
the allowable temperature range.
VRF
93-1
The quantity of the indoor unit
is more than the set.
1.Indoor unit quantity set is incorrect；
2.New indoor unit is added in the system.
Reset the number of the indoor units.
VRF
93-2
The quantity of the indoor unit
is less than the set.
1. Not all of the indoor unit s are power on;
2. The set quantity of the indoor unit is
incorrect;
3.Add or remove some indoor units
1. Put all the indoor units power on;
2. Reset the quantity of the indoor
units;
3. Reset the quantity of the indoor units
VRF
94
outdoor address conflict
1. Put all the indoor units power on;
2. Reset the quantity of the indoor units;
3. Reset the quantity of the indoor units
Change the setting address of the
outdoor unit
VRF
95
the refrigerant of the unit is
excessive fault
The refrigerant of the unit is excessive
Discharge the refrigerant and charge
the refrigerant refer to the rating label
VRF
