Toyotomi MTN-MTG A128FS Service Manual page 43

9.2.6 Indoor / outdoor units communication error
Turn off the power supply, after 1 minute, connect the
power supply , turn on the unit with remote controller
Check the wiring between indoor and outdoor
unit. Is the connection of L, N, S and GND good?
Is the LED4(red) bright and LED1(yellow)
blinking on outdoor PCB?
The power supply for outdoor PCB is fail.
Check the wiring on outdoor PCB
comparing with wiring plate. Is the
connection good?
Correct the connection
The unit does not work normally.
Yes
No
No
No
Yes
Yes
53
Reconnect and retest
Replace indoor PCB
and repower on. Is the
failure cleared?
The unit does not
work normally.
Replace outdoor e-box.