Mitsubishi Electric MSC-07RV-E2 Service Manual page 20

Compressor and / or outdoor fan motor doesn't operate.
Check of outdoor unit
D
Start
Is the switch SW2-2 on the
indoor electronic control
P.C. board set to MUH type?
Yes
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 J8 –J9
(MUH-07/09/12RV-
+
J205 –J101 (MUH-07/09/12RV-
on the deicer P.C. board?
Is there 220-240V AC between
3 on the compressor contactor
(52C) and N on the outdoor
terminal block (TB1)?
Check the compressor and compressor
capacitor, and rectify the connecting wire.
Outdoor fan motor
doesn't operate.
Is there 5V DC between J8 –J9
(MUH-07/09/12RV-
J205 + –J101 (MUH-07/09/12RV-
on the deicer P.C. board?
Check the outdoor fan motor
and rectify the connecting
wire.
<MUH-07/09/12RV>
Change the switch SW-2-2
No
on the indoor electronic control
P.C. board to MUH type.
+
–
No
, , )/
E2
E1 E3
)
– E4
Yes
No
Replace the
deicer P.C. board.
Yes
– +
No
, , )/
E1 E2 E3
)
–
E4
Yes
Is there 220-240V AC between 4
on the compressor contactor (52C) and
TAB20 on the deicer P.C. board?
Yes
Replace the
deicer P.C. board.
Is there 220-240V AC between 4 on
the compressor contactor (52C) and
TAB 20 on the deicer P.C. board?
Yes
Replace the
deicer P.C. board.
20
Rectify the indoor and
outdoor connecting wire.
No
No
Is there 220-240V AC between L–N
on the outdoor terminal block (TB1)?
Yes
Rectify the connecting wire.
Rectify the indoor and
outdoor connecting wire.
No
No
Is there 220-240V AC between L–N
on the outdoor terminal block (TB1)?
Yes
Rectify the connecting wire.