Mitsubishi Electric MSC-07RV-E2 Service Manual page 22

Compressor and / or outdoor fan motor doesn't stop.
V Check of outdoor unit
Start
Turn OFF the power supply.
After 1 minute, turn ON
power supply again.
Does compressor or
outdoor fan motor stop?
Yes
Ok
Compressor and / or outdoor fan motor doesn't stop.
V Check of outdoor unit
Start
Turn OFF the power supply.
After 1 minute, turn ON
power supply again.
Does compressor stop?
Yes
Ok
Does outdoor fan motor stop?
Yes
Ok
<MU-07/09/12RV>
Is there 12V DC between
No
1–2 on the outdoor
terminal block (TB2)?
Yes
Replace the indoor
electoronic control
P.C. board.
<MUH-07/09/12RV>
Is there 220-240V AC between 3 on
No
the compressor contactor (52C) and N on
the outdoor terminal block (TB1)?
Yes
Replace the
deicer P.C. board.
No
Replace the
deicer P.C. board.
Is there 220-240V AC between COM on
No
the compressor contactor (52C) and N on
the outdoor terminal block (TB1)?
No
Rectify the connecting wire.
No
Rectify the connecting wire.
22
Yes
Replace the compressor
contactor(52C).