61
Yes
Is there 5V DC between
J101 - J401 on the deicer
P.C. board? w1
Compressor
doesn't operate.
Yes
Is there 220-240V AC
between A1-A2 on the
compressor contactor(52C)?
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.
Outdoor fan motor
doesn't operate.
No
Make the connection
of wiring correct.
Check the compressor.
Replace the compressor
contactor(52C).
Start
Yes
Is there 220-240V AC
between 2/T1 on the
compressor contactor(52C)
and N on the outdoor
terminal block?
Yes
Is there 220-240V AC
between CN730 1-3 on
the deicer P.C. board? w1
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
Yes
No
Is there 220-240V AC
between 1/L1 on the
compressor contactor(52C)
and N on the outdoor
terminal block?
No
No
Make the connection
of wiring correct.
Yes
Yes
Is there 220-240V AC
between CN711 1-3 or
2-3 on the deicer P.C.
board? w1
No
Make the connection
of wiring correct.
Check the outdoor fan
motor. Refer to page 57.
Yes
Is there 220-240V AC
between CN730 1-3 on
the deicer P.C. board? w1
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
No
+
Is there 5V DC between
J101 - J401 on the deicer
P.C. board? w1
+
w1 Refer to page 70.
MSH-24RV
OB272-2.qxp 02.1.26 1:23 PM Page 61
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