Mitsubishi Electric MXZ-A14WV Service Manual page 58

Outdoor unit does not operate. (LED display: display OFF)
A A Check of power supply
MXZ-A14/A18WV
Start
Check the connecting of parts of main power supply circuit.
Turn on power supply.
Is there voltage of 230V AC in the
power supply terminal block?
Yes
Is there voltage of 230V AC across the
input terminal part in the diode module
(TAB61 and TAB62)?
Yes
Is there voltage of 325V DC across the
smoothing capacity (C61)?
Yes
Replace the outdoor electronic control
P.C. board.
MXZ-A26/A32WV
Start
Check the connecting of parts of main power supply circuit.
Turn on power supply.
Is there voltage of 230V AC in the
power supply terminal block?
Yes
Is the output voltage from the noise
filter P.C. board 230V AC?
Yes
Is the input voltage to the power board
230V AC?
Yes
Is the input voltage to the outdoor
electronic control P.C. board 325V DC?
Yes
Replace the outdoor electronic control
P.C. board.
No
Check the power supply cable.
No
Is fuse (F61) blown?
Yes
Replace the fuse.
Is the resistance ∞ between terminal
No
of reactor (L) ?
Yes
Replace the reactor.
No
Check the power supply cable.
No
Is fuse (F912) blown?
Yes
Replace the fuse.
No
Replace the reactor.
No
Replace the power board.
58
Replace the noise
No
filter P.C. board.
Replace the noise
No
filter P.C. board.