Gree GWC18KG-K3DNA6A - Page 78

75
Troubleshooting
(9) Communication malfunction (AP1 below
is control board of outdoor unit)
Main detection point:
z Check if the connection wire and the built-in wiring of indoor and outdoor unit is connected well and no damaged;
z If the communication circuit of indoor mainboard is damaged? If the communication circuit of outdoor mainboard
(AP1) is damaged?
Malfunction diagnosis process:
Start
Check communication
circuit of outdoor unit
Problem of
communication
circuit
Check built-
in wiring of
indoor and
outdoor unit
Connection
correct?
Malfunction of
circuit is
detected with
control board
AP1 voltage
Check connection
wire of indoor and
outdoor unit with
circuit diagram
Check connection
wire of indoor and
outdoor unit with
circuit diagram
If the unit is operation
normal before malfunction
Y
N
Y
N
If the wiring is
damaged?
If the malfunction
is removed?
N
Y
N
If the malfunction
is removed?
N
Replace indoor
board
Replace outdoor
mainboard AP1
If the
malfunction is
removed?
Finish
Y
N
Y
N
Y
Y