MITSUBISHI ELECTRIC MUZ-FD09NA- U1 - Manual (Page 26)

26
I Check of outdoor fan motor
J Check of power supply
Is the outdoor fan motor normal?
(Refer to 10-4.)
Replace the outdoor fan motor.
Disconnect CN932 from the inverter P.C. board, and
measure the resistance of the outdoor fan motor.
Replace the inverter P.C. board.
No
Yes
Is there voltage 208/230 VAC
between the indoor terminal
block S1 and S2?
No
Yes
Replace the indoor
electronic control P.C.
board.
Rectify indoor/outdoor
connecting wire.
Yes
If light up, OK.
If fl ash, refer to 10-3.
Does POWER lamp on the indoor
unit light up?
Dose LED on the inverter P.C.
board light up or fl ash? (Refer
to 10-6.1.)
No
Replace the inverter
P.C. board.
Is there voltage 280 ~ 370 VDC
between DB61 (+) and DB61 (–) on
the inverter P.C. board?
(Refer to 10-6.1.)
No
Check the electric parts in main circuit.
Yes
Yes
No
Disconnect the connector (CN61)
between compressor and intelligent
power module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Inverter P.C. board
(Solder side)
DB61
280 ~ 370 VDC