Compressor And/Or Outdoor Fan Doesn’t Operate - Mitsubishi Electric MSC-A07WV Service Manual

Compressor and/or outdoor fan doesn't operate.
D D Check of outdoor unit
Start
Is there 230V AC
between L - N on the TB1
of outdoor unit?
Yes
Press the EMERGENCY
OPEERATION switch of all
indoor units.
3 minutes later, is there
12V DC between
1 - 2 on the all terminal
blocks of outdoor unit?
Yes
Is there 10~15V DC between
JP20 DC12V and JP19 GND
on outdoor control P.C.
board?
Yes
MUX-A19/A25WV
Disconnect connector of outdoor fan motor
CN91 and outdoor fan capacitor C61.
Is the resistance 0" or ∞ between the lead wire
WHT and BLK of outdoor fan motor, or between
the lead wire RED and BLK of outdoor fan motor?
(Refer to page 111.)
Fan motor doesn't operate.
Turn OFF the power supply
to outdoor unit.
Does outdoor control P.C.
board connect with outdoor
fan capacitor C61?
Yes
Disconnect connector of
outdoor fan motor CN91
and outdoor fan capacitor
C61.
Is the resistance 0" or ∞
between the lead wire
WHT and BLK of outdoor
fan motor, or between the
lead wire RED and BLK
of outdoor fan motor?
(Refer to page 111.)
Yes
Replace the outdoor
fan motor.
<MUX-A19/A20/A25/A26WV>
No
Check the power supply
and connecting wire.
Is there 12V DC between
No
1 - 2 on the terminal
block of each indoor unit?
Yes
Check and rectify the
connecting wire of
indoor and outdoor unit.
No
Turn OFF the power supply.
Is fuse(F61) on the outdoor
control P.C. board blown?
Yes
MUX-A20/A26WV
Yes
Replace the outdoor
fan motor and fuse(F61).
Connect the outdoor control
No
P.C. board with outdoor fan
capacitor C61.
No
Replace the outdoor
control P.C. board.
No
Check the indoor unit.
No
Replace the outdoor
control P.C. board.
Measure resistance all
the solenoid coil.
Is resistance 0"?
No
No
Short both terminal
of fuse(F61).
Is the resistance 0" between
the fuse(F61) and the terminal
of CN903?
Yes
Replace the outdoor
control P.C. board.
Compressor doesn't operate.
Turn OFF the power supply to outdoor unit.
Disconnect connecting wire of X521 and X522 from outdoor control P.C. board.
Insulate terminal of connecting wires to prevent contact of other parts.
Turn ON the power supply to outdoor unit.
Press the EMERGENCY OPERATION switch of all indoor unit.
3 minutes later, is the resistance 0" between the
terminal 3 and 4 of X521 on outdoor control P.C. board,
and between the terminal 3 and 4 of X522 on outdoor
control P.C. board?
Yes
Turn OFF the power supply
to outdoor unit.
Is the resistance 0" or ∞
between the terminal C and
No
R of MC1, and between the
terminal C and S of MC1?
(Refer to page 110.)
Yes
Replace the
compressor MC1.
114
Yes
Replace the solenoid coil.
No
Replace
the fuse(F61).
No
Turn OFF the power supply
to outdoor unit.
Replace the outdoor
control P.C. board.
Is the resistance 0" or ∞
between the terminal C and
No
R of MC2, and between the
terminal C and S of MC2?
(Refer to page 110.)
Yes
Replace the
compressor MC2.
Check and
rectify the
connecting wire
of terminal and
compressor.