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(1) Operation does not
start
.
MUM30EN
(
_____
start~)
Remove
the in/out
connection
cable
from
the outdoor
unit
.
Check the
voltage at the outdoor side cable.
Disconnect
in/out
connection cable
from
the
terminal
block.
Is there 12
DC
t
o connection cable
?
Yes
Check outdoor terminal block.
Is there 230V AC between
[Ii]
-
[ill
?
Is there
1
1
5V
AC between
[Ii]
-
[!TI
?
Is there
1
1
5V
AC between
[ill -
[!TI
?
Yes
Connect
in/out
connection cable to the terminal block.
Is there
12V DC
at the terminal block ?
Yes
Disconnect connectors of CN621, CN622,
CN623
from outdoor P
.C.
board
.
Does
52C
contactor
works
w
hen voltage to
in/out
connection cable
change.
?
Yes
Replace
outdoor
P. C.
board.
Something
is
wrong with
indoor
unit.
Refer to t he page for indoor unit.
Check and rectify the wiring and the
breaker.
Replace
52C
contactor
Check
52C
contactor.
If
52C
is
fault,
replace
it.
32
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