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
109
8
The expansion valve or the capillary is failure
Replace the expansion valve or the capillary
Note 4:Over load in heating mode
Overload in heating mode
sr. The root cause
Corrective measure
1
The refrigerant is excessive
Discharge the refrigerant, and recharge the refrigerant refer to the
rating label
2
The indoor ambient temperature is too high
Please use within allowable temperature range
3
The air outlet and air inlet of the indoor unit is short-circuit
Adjust the installation of the indoor unit refer to the user manual
4
The indoor filter is dirty
Clean the indoor filter
5
The speed of the indoor fan motor is too low
Check the indoor fan motor and fan capacitor
6
The indoor fan is broken or the outdoor fan is blocked
Check the indoor fan
7
The air inlet and outlet has been blocked
Remove the blocked thing
8
The expansion valve or the capillary is failure
Replace the expansion valve or the capillary