Service manual

19
Check of outdoor unit
D
Compressor and / or outdoor fan motor doesn’t operate.
Yes
Is there 220-240V AC
between 1–2 on the outdoor
terminal block (TB2)?
Compressor
doesn't operate.
Operate the unit in COOL 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.
Check the power supply, and
rectify the connecting wire.
Check the indoor electronic
control P.C. board, and rectify
the indoor and outdoor
connecting wire.
Start
No
No
Yes
Is there 220-240V AC between L–N
on the outdoor terminal block (TB1)?
Is the switch SW2-2 on the
indoor electronic control
P.C. board set to MU type?
No
Change the switch SW-2-2
on the indoor electronic control
P.C. board to MU type.
Yes
Is there 220-240V AC between L–N
on the outdoor terminal block (TB1)?
Is there 12V DC between
1–2 on the outdoor
terminal block (TB2)?
No
Check the indoor electronic
control P.C. board, and rectify
the indoor and outdoor
connecting wire.
Yes
Is there 220-240V AC between COM
on the compressor contactor (52C) and
N on the outdoor terminal block (TB1)?
Yes
Check the compressor and
compressor contactor, and
rectify the connecting wire.
Replace the compressor
contactor (52C).
No
Yes
Is there 220-240V AC between COM
on the compressor contactor (52C) and
N on the outdoor terminal block(TB1)?
Yes
Check the outdoor fan motor
and outdoor fan capacitor,
and rectify the connecting wire.
No
Check the power supply, and
rectify the connecting wire.
Replace the compressor
contactor (52C).
No
E1
E2
E3
MU-07/09/12RV- , ,
Is fuse "F" (2A) blown?
No
Replace the fuse "F" (2A).
Yes
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