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J Check of power supply
Is there voltage 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 11-3.
Does the upper lamp of
OPERATION INDICATOR on the
indoor unit light up?
Does LED on the inverter P.C.
board light up or fl ash? (Refer
to 11-6.1.)
No
Replace the inverter
P.C. board.
Is there bus-bar voltage 260 - 300
VDC between DB61 (+) and DB61
(–) on the inverter P.C. board?
(Refer to 11-6.1.)
No
Check the electric parts in main circuit.
Yes
Yes
No
Disconnect the connector between
compressor and intelligent power
module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
Inverter P.C. board
(Solder side)
DB61
260 - 300 VDC
Is there voltage 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 11-3.
Does the upper lamp of
OPERATION INDICATOR on the
indoor unit light up?
Does LED on the inverter P.C.
board light up or fl ash? (Refer
to 11-6.1.)
No
Replace the inverter
P.C. board.
Is there bus-bar voltage 325 - 370
VDC between JP715 (+) and JP30
(–) on the inverter P.C. board?
(Refer to 11-6.1.)
No
Check the electric parts in main circuit.
Yes
Yes
No
Disconnect the connector between
compressor and intelligent power
module.
Turn ON power supply and press
EMERGENCY OPERATION switch.
325 -370 VDC
JP30
JP715
MUZ-GE25/33/35/42/50
MUZ-GE60/71/80
MUZ-GE60VA MUZ-GE60VAD MUZ-GE71VA MUZ-GE71VAD
MUZ-GE80VA MUZ-GE80VA2 MUZ-GE80VAD
MUZ-GE25VA MUZ-GE25VAD MUZ-GE33VA MUZ-GE35VA MUZ-GE35VA2 MUZ-GE35VAD
MUZ-GE42VA MUZ-GE42VAD MUZ-GE50VA MUZ-GE50VA2 MUZ-GE50VAD
OBH532E