- 124 -
Ref
er to 4.
(1) 3.
Ref
er to 4.
(1) 2.
No
.1 Refr
iger
ant circuit
chec
k
Ref
er to 4.
(1) 2.
Chec
k the
malfunctioning
refr
iger
ant circuit.
Chec
k f
or the M-NET tr
ansmission line
.
Replace the indoor unit control board.
Connect 2 remote controllers of less
.
Demand control
b
y
MELANS?
Exter
nal ther
mo input
setting? (SW3-3=ON)
Is the unit g
rouped
with the equipment
pac
kage indoor unit?
Chec
k whether there is a
fault with other indoor units
.
Error displa
y?
Ther
mo is OFF?
Is oper
ation possib
le?
Is the compulsor
y
ther
mo OFF (SW
A)
s
witch set to
“2
” or
“3
”?
If no f
ault is f
ound
K
eep displa
ying f
o
r
more than 3 min
utes
.
Chec
k f
or the po
w
er supply
.
Chec
k f
or the wire f
or the remote controller
.
Replace the indoor control board.
Replace the remote
controller or the indoor
control board.
K
eep the oper
ation.
Nor
mal
T
u
rns off within appro
ximately 3 min
utes
.
After tur
ning on the or
iginal po
w
e
r,
restar
t the controller
.
Dur
ing this time
,
“HO
” is displa
y
ed on the MA remote controller
.
Nor
mal Include when
“Centr
ally controlled
” is displa
y
ed.
YES
Ref
er to the error code list.
Nor
mal
Nor
mal (Is the ther
mo OFF signal input?)
Set the SW
A to
“1
”.
Chec
k f
or the equipment pac
kage indoor unit.
Replace the remote controller or the indoor control board.
Replace the indoor control board.
Replace the remote
controlleror the indoor
unit control board.
Nor
mal (Oper
ate the unit
with e
xter
nal oper
ation)
Use the wire that meets the specification.
Replace the MA remote controller
.
Chec
k f
or the wire f
o
r
the remote controller
.
K
eep the oper
ation
Replace the indoor unit control board.
Ref
er to 4.
(1) 1
Ref
er to 4.
(1) 1-(2)
Error displa
y?
After tur
ning the po
w
er on, chec
k whether
“HO
” is displa
yed on the remote controller
.
Is
“
” displa
y
ed on
the remote controller?
Running g
roup
oper
ation with the MA
remote controller?
Flic
k
e
ring?
Chec
k LD1 on the indoor
unit control board.
Lit on?
After more than 20 min
utes since
tur
ning the po
w
er on, is LED2
chec
k of the indoor control board
still displa
y
ed?
Indoor unit
po
w
er f
ailure?
T
u
rn
the po
w
er on
T
u
rn
the po
w
er on
Chec
k the indoor unit on
which LED2 is displa
y
ed.
Is LED2 on the control
boards of other indoor
units displa
y
ed?
All the indoor unit
po
w
er f
ailure?
Is there an indoor unit
where there is no
displa
y of LED2 on
all control boards?
Does the unit w
o
rk
proper
ly when it is
daisy-chained again?
Replace the indoor
unit control board.
Ref
er to 4.
(1) 1
✻
After handling the prob
lem,
daisy-chain the wire f
or the
MA remote controller again.
Chec
k f
or daisy-chain
Replace the MA remote controller
Does the MA remote controller
w
or
k proper
ly when it is connected
to the specified indoor unit?
Chec
k f
or
po
w
er supply
Running g
roup
oper
ation with the MA
remote controller?
Does the unit w
o
rk
proper
ly
when the po
w
er is reset?
Replace the indoor unit
control board when the
unit star
ts r
unning.
“Centr
ally controlled
”
displa
y?
Ref
er to the self-diagnosis
handling list f
or the
displa
y
ed error code
.
Ref
er to the self-diagnosis
handling list f
or the
displa
y
ed error code
.
Is the oper
ation
for bidden b
y
MELANS or is the
e
xter
nal oper
ation input setting made?
(SWC=ON)
Does the unit w
o
rk
proper
ly
when the po
w
er is reset?
K
eep the oper
ation.
When disconnecting the daisy-
chain betw
een the MA remote
controllers of the indoor unit, is
LED2 on either control board of
each indoor unit displa
y
ed?
Chec
k whether the
scre
w f
or the daisy-
chain is not loose
.
Does the indoor unit mak
e
an instantaneous stop?
When oper
ating with the
remote controller
, the
“ON
” displa
y will appear
.
Flic
k
e
ring? (T
ur
ns on
momentar
ily
appro
ximately e
v
er
y
20 second)
Chec
k the v
oltage
betw
een the MA remote
controller ter
minals (A and
B).
Less than DC9-13V?
Chec
k whether LD1 on the
indoor unit control board is
flic
k
e
ring.
(Flic
k
ers f
or 2 or 3
seconds appro
ximately e
v
er
y
20 seconds)
Does the n
umber of the
MA remote controllers
that are connected to an
indoor unit e
xceed the
allo
w
a
b
le r
ange (2 units)?
Chec
k the v
oltage
betw
een the MA remote
controller ter
minal b
loc
ks
(TB15) (A and B).
Less
than DC9-13V?
Disconnected wire f
or the
remote controller?
Disconnected wire to the
ter
minal b
loc
k? Disconnected
rela
y connector?
Are the length and the
diameter of the wire f
or MA
remote controller out of
specification?
No f
ault with the
equipment pac
kage
indoor unit?
K
eep displa
ying
“HO
” on the MA
remote controller
.
If oper
ated
afterw
ards
, error
6602 or 6607 occurs
.
Although No
.1
refr
iger
ant circuit is
nor
mal, No
.2 or No
.3
refr
iger
ant circuit
k
eep stopping.
T
u
rn
on the indoor
unit again?
Does the unit w
o
rk
proper
ly when the
po
w
er is reset?
Shor
t circuit of the
remote controller?
P
o
w
er supply v
oltage
A
C200-260V?
YES
NO
NO
YES
NO
YES
NO
NO
NO
NO
YES
YES
YES
YES
NO
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
NO
NO
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
YES
NO
YES
NO
NO
NO
NO
NO
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
YES
NO
NO
NO
YES
YES
YES
YES
YES
<Flow chart>
Even if the operation SW on the remote controller is pressed, the indoor and the outdoor units do not start running.
