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
A
A
S
S
-
-
0
0
9
9
U
U
R
R
4
4
S
S
G
G
N
N
PQ
7-2. Service flow chart
No
No
Yes
No
No
Yes
No
Yes
Yes
Yes
No
Yes
No
Check the first and secondary
voltage.
The first voltage:220V
The secondary voltage:
*C15:12V
CN4(1,2terminal):5V
Switch on the power
supply
Are the wires poorly
connected?
Check all wires are
connected correctly
After replacing the
display board, Is there
still trouble?
No
Replace
the
control
board
Display board
trouble
Indoor control board is faulty.
Replace it.
No
Does it receive the
remote controller
signal?
Yes
Start up self-test
function
Is the remote
controller in good
condition
Check the result
Replace the battery press
ACL button.
Retry remote operation.
After replacing
the display
board.
Display board
problem
Replace the
indoor board.
Is there still
trouble?
Yes
Check operation
Is indoor control
board short
circuit?
Check and find
short circuit or open
circuit among other
components such
as
transformer or
fan motor
No
Replace the indoor
Yes
Yes
Is the fuse(F01,
3.15A/250V) blown?
Does DLED screen
display normally?
第 30／51页
