16
Compressor and / or outdoor fan motor dose not stop.
After 30 seconds,
did compressor stop?
No
Yes
Replace the
deicer P.C. board.
Yes
1
Turn OFF the power supply.
2
After 30 seconds, turn ON the power supply again.
3
Operate the unit in COOL mode by pressing the
EMERGENCY OPERATION switch.
4
Operate the unit for 1 minute or more and stop it by
pressing the EMERGENCY OPERATION switch again.
Ok
No
After 30 seconds,
did outdoor fan stop?
Replace the
deicer P.C. board.
Yes
Ok
No
Is there 220-230V AC between
2
on the compressor
contactor(52C) and
N
on the outdoor terminal
block?
Yes
Replace the compressor
contactor(52C).
No
Make the connection
of wiring correct.
Is there 220-230V AC
between A1 and A2 on the
compressor contactor (52C)?
MU-A30ND
1
Turn OFF the power supply.
2
After 30 seconds, turn ON the power supply again.
3
Operate the unit in COOL mode by pressing the
EMERGENCY OPERATION switch.
4
Operate the unit for 1 minute or more and stop it by
pressing the EMERGENCY OPERATION switch again.
After 30 seconds, does
compressor stop ?
Yes
No
Is there 220-230V AC
between
3
-
N
on the outdoor
terminal block?
Replace the indoor
electronic control P.C.
board.
No
Make the connection
of wiring correct.
Is there 220-230V AC
between
3
-
N
on the indoor
terminal block?
Yes
Reconnect the continuity
of indoor and outdoor
unit connection.
Is there 220-230V AC
between
1
on the compressor
contactor(52C) and
N
on the
outdoor terminal block?
No
Yes
Reconnect the continuity
of indoor and outdoor
unit connection.
Yes
Replace the compressor
contactor(52C).
OK
No
After 30 seconds, does
outdoor fan motor stop ?
Yes
Is there 220-230V AC
between
3
-
N
on the indoor
terminal block?
No
OK
Replace the indoor
electronic control P.C.
board.
Yes
No
Is there 220-230V AC
between
3
-
N
on the outdoor
terminal block?
Make the connection
of wiring correct.
Is there 220-230V AC
between
3
on the compressor
contactor(52C) and
N
on the
outdoor terminal block?
Yes
Replace the compressor
contactor(52C).
No
Yes
No
MU-A24ND -
S2
Check of outdoor unit
B
OB405E.qxp 09.10.14 9:16 AM Page 16
