Mitsubishi Electric MXZ-2D33VA-E1 Service Manual page 78

11-6. TROUBLESHOOTING FLOW
• When outdoor unit does not operate, LED on outdoor P.C. board is not lighting.
Check of power supply
MXZ-2D33VA/2D40VA/2D53VA/2D53VAH
Check the main power supply circuit for proper connections.
Turn ON the breaker.
Is there voltage of 230V AC in the
power supply terminal block?
Yes
Is there voltage of 230V AC between
LD66B and X64 on the inverter
P.C. board?
Yes
Is there voltage of 230V AC between
LD66A and LD70 on the inverter
P.C. board?
Yes
Is there voltage of 325V DC between
-
DB61 + and DB61
P.C. board?
Yes
Is there voltage of 5V DC between
CN936 and CN936
outdoor display P.C. board?
Yes
Replace the outdoor disply P.C. board.
OBH626B
No
No
No
No
on the inverter
No
on the
Check the power supply and correct them.
Replace the inverter P.C. board.
Replace the reactor.
Replace the inverter P.C. board.
Check the conneced wire between
the inverter P.C. board and outdoor
display P.C. board and correct it.
Replace the inverter P.C. board.
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