Mitsubishi Electric MSH-18RV Service Manual page 62

MSH-30RV
Turn ON the power supply.
Is there 220-240V AC
L N
to between - on the
?
outdoor terminal block
Yes
Compressor
does not operate.
Is there 5V DC between
J101
+
P.C. board? w1
Operate the unit in
COOL or HEAT mode by
pressing the EMERGENCY
OPERATION switch.
3minutes after the power
supply turns ON, is there
220-240V AC between
A1-A2 on the compressor
contactor?
Is there 220-240V AC
between 2/T1 on the
compressor contactor(52C)
and N on the outdoor
terminal block?
Check the compressor.
Outdoor fan motor
does not operate.
Is there 5V DC between
J101 +
P.C. board? w1
Operate the unit in
COOL or HEAT mode by
pressing the EMERGENCY
OPERATION switch.
Is there 220-240V AC
between CN711 1-3 or
2-3 on the deicer P.C.
board? w1
Check the outdoor fan
motor. Refer to page 58.
No
Check the outdoor power supply
and connection of wiring.
Is there 220-240V AC
No
between CN730 1-3 on
- J401 on the deicer
the deicer P.C. board? w1
Yes
No
Yes
Is there 220-240V AC
No between 1/L1 on the
compressor contactor(52C)
and N on the outdoor
terminal block?
Yes
Replace the compressor
contactor(52C).
No Is there 220-240V AC
CN730 1-3 on the deicer
- J401 on the deicer
P.C. board? w1
Yes
No
Yes
No
Yes
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
Yes
No
Yes
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
62
Make the connection
of wiring correct.
Make the connection
of wiring correct.
Make the connection
of wiring correct.
w1 Refer to page 70.