Check Of Outdoor Unit - Mitsubishi Electric MSC-07RV Service Manual

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 MU type?
Yes
Operate the unit in COOL mode by pressing the
EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
Is there 220-240V AC
between 1–2 on the outdoor
terminal block (TB2)?
Check the indoor electronic
control P.C. board, and rectify
the indoor and outdoor
connecting wire.
MU-07/09/12RV-
Is fuse "F" (2A) blown?
Is there 12V DC between
1–2 on the outdoor
terminal block (TB2)?
Check the indoor electronic
control P.C. board, and rectify
the indoor and outdoor
connecting wire.
<MU-07/09/12RV>
Change the switch SW-2-2
No
on the indoor electronic control
P.C. board to MU type.
Compressor
doesn't operate.
Yes
No
Is there 220-240V AC between COM
on the compressor contactor (52C) and
N on the outdoor terminal block (TB1)?
Outdoor fan motor
doesn't operate.
Yes
, ,
E1 E2 E3
Replace the fuse "F" (2A).
No
Yes
No
Is there 220-240V AC between COM
on the compressor contactor (52C) and
N on the outdoor terminal block(TB1)?
Is there 220-240V AC between L–N
on the outdoor terminal block (TB1)?
Yes
Yes
Check the compressor and
compressor contactor, and
rectify the connecting wire.
Is there 220-240V AC between L–N
on the outdoor terminal block (TB1)?
Yes
Yes
Check the outdoor fan motor
and outdoor fan capacitor,
and rectify the connecting wire.
19
No
Check the power supply, and
rectify the connecting wire.
No
Replace the compressor
contactor (52C).
No
Check the power supply, and
rectify the connecting wire.
No
Replace the compressor
contactor (52C).