15
Is there 220-230V AC to
between
L
-
N
on the
outdoor terminal block
?
No
Check the outdoor power supply
and connection of wiring.
Yes
Check the deicer P.C.
board. Refer to 8-5.
Is there 5V DC?
Compressor
dose not operate.
Yes
Press the EMERGENCY
OPERATION switch.
3-minute time delay works.
Test run operation
operates for 30 minutes.
Outdoor fan motor
dose not operate.
No
Make the connection
of wiring correct.
Check the compressor.
Replace the compressor
contactor(52C).
Turn ON the power supply.
Yes
Is there 220-230V AC between
2
on the compressor
contactor(52C) and
N
on
the outdoor terminal block?
Yes
Is there 220-230V AC CN730
on the deicer P.C. board?
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
No
No
Yes
Yes
Check the deicer P.C.
board. Refer to 8-5.
Is there 5V DC?
Yes
Is there 220-230V AC
CN711
1
-
3
or
2
-
3
on
the deicer P.C. board?
No
Make the connection
of wiring correct.
Check the outdoor fan
motor. Refer to 8-3.
Yes
Is there 220V AC CN730
on the deicer P.C. board?
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
No
Press the EMERGENCY
OPERATION switch.
3-minute time delay works.
Test run operation
operates for 30 minutes.
Is there 220-230V AC
between A1 and A2 on the
compressor contactor (52C)?
Check of outdoor unit
A
8-4. Troubleshooting flow
Compressor and / or outdoor fan motor dose not operate.
MU-A30ND
OB405E.qxp 09.10.14 9:16 AM Page 15
