– 47 –
10. HOW TO DIAGNOSE THE TROUBLE
The pulse motor circuits are mounted to both indoor and outdoor units. Therefore, diagnose troubles according
to the trouble diagnosis procedure as described below. (Refer to the check points in servicing written on the
wiring diagrams attached to the indoor/outdoor units.)
Table 10-1
10-1. First Confirmation
10-1-1. Confirmation of Power Supply
Confirm that the power breaker operates (ON) normally.
10-1-2. Confirmation of Power Voltage
Confirm that power voltage is AC 220–230–240 ± 10%.
If power voltage is not in this range, the unit may not operate normally.
10-1-3. Operation Which is not a Trouble (Program Operation)
For controlling the air conditioner, the program operations are built in the microcomputer as described in the
following table.
If a claim is made for running operation, check whether or not it meets to the contents in the following table.
When it does, we inform you that it is not trouble of equipment, but it is indispensable for controlling and
maintaining of air conditioner.
Table 10-1-1
No.
Troubleshooting Procedure
1
Fir
s
t Confirm
a
tion
2
Prim
a
ry J
u
dgment
3
J
u
dgment
b
y Fl
as
hing LED of the
s
ign
a
l receiving
u
nit
4
Self-Di
a
gno
s
i
s
b
y Remote Controller
5
J
u
dgment of Tro
ub
le
b
y Every Symptom
No.
Troubleshooting Procedure
6
How to Check Simply the M
a
in P
a
rt
s
7
Tro
ub
le
s
hooting
8
How to Di
a
gno
s
e Tro
ub
le in O
u
tdoor Unit
9
How to Check Simply the M
a
in P
a
rt
s
10
How to Simply J
u
dge Whether O
u
tdoor F
a
n Motor i
s
Good or B
a
d
n
o
i
t
p
i
r
c
s
e
D
r
e
n
o
i
t
i
d
n
o
c
r
i
a
f
o
n
o
i
t
a
r
e
p
O
.
o
N
1
When power
b
re
a
ker i
s
t
u
rned “ON”, the
oper
a
tion indic
a
tor (Green) of the
s
ign
a
l
receiving
u
nit fl
as
he
s
.
The OPERATION l
a
mp of the
s
ign
a
l receiving
u
nit
fl
as
he
s
when power
s
o
u
rce i
s
t
u
rned on. If [
]
bu
tton
i
s
oper
a
ted once, fl
as
hing
s
top
s
.
(Fl
as
he
s
a
l
s
o in power f
a
il
u
re)
2
Compre
ss
or m
a
y not oper
a
te even if the room
temper
a
t
u
re i
s
within r
a
nge of compre
ss
or-ON.
The compre
ss
or doe
s
not oper
a
te while compre
ss
or
re
s
t
a
rt del
a
y timer (
3
-min
u
te
s
timer) oper
a
te
s
.
The
sa
me phenomenon i
s
fo
u
nd
a
fter power
s
o
u
rce
h
as
b
een t
u
rned on
b
ec
aus
e
3
-min
u
te
s
timer oper
a
te
s
.
3
In Dry
a
nd ECO mode, FAN (
a
ir flow) di
s
pl
a
y
doe
s
not ch
a
nge even tho
u
gh FAN (
a
ir flow
s
elect)
bu
tton i
s
oper
a
ted.
The
a
ir flow indic
a
tion i
s
fixed to [AUTO].
4
In AUTO mode, the oper
a
tion mode i
s
ch
a
nged.
After
s
electing Cool or He
a
t mode,
s
elect
a
n oper
a
tion
mode
a
g
a
in if the compre
ss
or keep
s
s
top
s
t
a
t
us
for
15 min
u
te
s
.