Gree GWC12ATCXB-K6DNA1B - Page 56

53
Installation and Maintenance
Service Manual
2. Communication malfunction
Main check points:
(1) Connection wire between indoor unit and outdoor unit
(2) Wiring inside the unit
(3) Communication circuit of control board of indoor unit
(4) Communication circuit of control board of outdoor unit
Y
N
Y
N
N
Y
N
N
Y
N
Y
N
Y
Y
Check whether the
unit has operated normally before
the malfunction occurs.
Check the connection wire of
indoor unit and outdoor unit
according to the wiring diagram.
Check whether the connection
wire of controller inside the
electric box of indoor/outdoor
unit is loose.
Is the
connection correct?
Connect the connection
wire of indoor/outdoor unit
correctly according to the
wiring diagram.
Connect the connection wire of
indoor/outdoor unit correctly
according to the wiring diagram.
Is the connection
wire of electric box is
normal?
Check the communication
circuit of outdoor unit
Is there's problem
for the communication
circuit?
Replace the control
board of outdoor unit.
Replace the control board
of indoor unit.
Start
End
Eliminate
malfunction
Eliminate
malfunction
Eliminate
malfunction