Vivax ACP-12CT35GECI Service Manual page 48

(2) Troubleshooting for communiction malfunction
Main check point:
Check whether the connection wire for indoor and outdoor units and the wires
inside the indoor unit is connected well;
Check whether the mainboards of indoor unit or outdoor unit are damaged;
Check flow chart:
Communication malfunction
for some indoor unit
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
De-energize the unit, exchange the communication wire
for the indoor unit with normal communication and the
indoor unit with malfunction, energize the unit and then
wait for 3mins
Whether the indoor unit
resumes normal?
No
Replace mainbaord of indoor unit
with malfunction
44
No
Yes
End
Connect wires according
to wiring diagram
Replace mainboard of
outdoor unit
Troubleshooting
Yes
Is malfunction
eliminate?
No