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