Toyotomi KURO Mini Service Manual page 80

All indoor units alarms
communication malfunction
Disconnect the power, and check
connection wire for indoor and outdoor
units and wires inside electric box are
connected correctly
Wires are
connected correctly?
Yes
Disconnect the power, and check whether
theconnection wires between mainboard of
outdoorunit and filter palte are connected
correctly byreferring to wiring diagram
Wires are
connected correctly?
Yes
Whether connection
wires are damaged?
No
Check whether the neutral
wirefor mainboard of outdoor
unit haspower input
Whether there's
power input?
Yes
Replace mainboard of
outdoor unit
Communication is
resumed ?
Yes
End
Connect wire
No
connectly according
to wiring diagram
Connect wire
No
connectly according
to wiring diagram
Replace
Yes
connection
wires
Replace filter plate of
No
outdoor unit
No Replace filter plate
of outdoor unit
Yes
Is malfunction eliminated?
No
Yes
Is malfunction eliminated?
No
Yes
Is malfunction eliminated?
No
Yes
Is malfunction eliminated?
No