119
K
K
Check of outdoor unit serial signal
No
Yes
Start
1. Check the indoor unit with referring to
G
How to check mis-wiring and serial signal error.
2. Turn off the power supply of the indoor and outdoor unit and connect the indoor/ outdoor unit connecting wire correctly
3. Check the connection of indoor/ outdoor unit connecting wire in the outdoor unit terminal block, and check the connection
of the connector (CN601: unit A, CN602: unit B) in the control P. C. board.
4. Disconnect the lead wire to the compressor. 3 minutes after turning on the power supply, start EMERGENCY
OPERATION.
Is there voltage from 5V DC - 10V DC between
No. 3 (+) and N (-) in the outdoor terminal block.
Replace the outdoor electronic control P. C. board.
Recheck a connected circumstance of the indoor/ outdoor unit connecting wire.
Turn on power supply
No
Yes
Yes
No
No
Yes
Yes
No
Yes
Replace the reactor.
Start
Check the connecting of main circuit parts .
Is there voltage of 230V AC in the
power supply terminal block?
Is there voltage of 325V DC across the
smoothing capacity (C61)?
Check the power supply cable.
Replace the outdoor electronic control
P. C. board.
Replace the noise
filter P. C. board
Is there voltage of 230V AC across the
input terminal part in the diode module
(TAB61 and TAB62)?
Is fuse (F61) blown?
Replace the fuse.
Is the resistance
∞
between terminal
of reactor (L) ?
J
J
Check of power supply
Outdoor unit does not operate. (LED display: display OFF)
Outdoor unit does not operate. (LED display: Both LED1 and LED2 lighting)
<MXZ-A18WV>
<MXZ-A18WV>
OB307A4.qxp 03.2.19 4:11 PM Page 119