Mitsubishi Electric MSH-18RV Service Manual page 61

MSH-24RV
Start
Operate the unit in COOL or HEAT mode by pressing the
EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
Compressor
doesn't operate.
Is there 5V DC between
No
+
J101 - J401 on the deicer
P.C. board? w1
Yes
Is there 220-240V AC
No
between A1-A2 on the
compressor contactor(52C)?
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
doesn't operate.
Is there 5V DC between
No
+
J101 - J401 on the deicer
P.C. board? w1
Yes
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 57.
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
between CN730 1-3 on
the deicer P.C. board? w1
Yes
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
61
Make the connection
of wiring correct.
Make the connection
of wiring correct.
Make the connection
of wiring correct.
w1 Refer to page 70.