Mitsubishi Electric MSC-07RV Service Manual page 134

Check of outdoor unit
D
Compressor and / or outdoor fan does not operate.
Start
Check the voltage to terminal block of
outdoor unit. Is there AC220~240V to
L N?
terminal block between -
Yes
Outdoor unit does not
operate.
Compressor
does not operate.
Outdoor fan motor
does not operate.
Check of outdoor unit
D
Compressor and outdoor fan do not operate.(Only indoor fan operates.)
Start
Press EMERGENCY ON/OFF button.
3-minute time delay works.
Test mode operates for 30 minutes.
Check voltage to terminal block of outdoor unit. Is
there 220-240V AC to terminal block between L L -
N N ?
Check voltage to terminal block of indoor unit. Is
there DC12V to terminal block between 2 2 - 1 1 ?
Check the fuse. Is it cut?
Check the outdoor fan motor , compressor , relay ,
and wiring.
<MUH-07/09/12RV>
No
Check the outdoor power supply,
power supply cord and connection.
Is the switch(SW2-2) on the
indoor electronic control
P.C. board set to MUH type?
Change the switch
(SW2-2) on the indoor
electronic control P.C.
board to MUH type.
See page 29.
Is the connection of
wiring from terminal block
to compressor correct?
Make the connection of
wiring from terminal
block to compressor
correct.
Is the connection of wiring
from terminal block to
outdoor fan motor correct?
Make the connection
of wiring from terminal
block to outdoor fan
motor correct.
<MUX-10/18/24RV>
No
Yes
No
Yes
Yes
No
Check the compressor
and outdoor fan motor.
See page 131.
Check the DEICER
Yes
P.C. board. See page 145.
Is it normal?
No
Does outdoor unit operate?
Replace the compressor.
Check the compressor.
Yes
See page 131.
Is it normal?
No
Does outdoor unit operate?
Replace the outdoor
fan motor.
Check the outdoor fan
Yes
motor. See page 131.
Is it normal?
No
Does outdoor unit operate?
Check the connection of indoor and outdoor
Check continuity of indoor and outdoor unit connection.
134
No.
Yes
Ok
No.
Yes
Ok
No
Check the DEICER
Yes
P.C. board.
See page 145.
No.
Yes
Ok
No
Check the DEICER
Yes
P.C. board.
See page 145.
No.
Yes
Ok
and the power supply.
Replace the fuse.