Gree GWH18YD-K6DNA2A Service Manual page 61

7
Malfunction indicator of outdoor unit
check points
N
Correctly connect the
wires for the indoor and
outdoor units according
to the wiring diagram
If the fault is
eliminated?
58
of indoor mainboard
Y
Check if the controller connection wire
inside the electric box of indoor and
outdoor unit is loose
If the connection
wire inside electric box
is normal?
Y
Check the communication
circuit of the outdoor unit
N
The communication
circuit is abnormal
N
Replace the mainboard
of indoor unit
Y
Start
Did the equipment operate
normally before the failure
occurs?
Y
Replace the mainboard
Y
(AP1) of outdoor unit
If the fault is eliminated?
Y
End
of outdoor mainboard(AP1)
ed is
N
Check the wiring of the indoor
and outdoor units according to
the wiring diagram
Is the connection right?
N
N
Correctly connect the
corresponding wires for
the indoor and outdoor
units according to
the wiring diagram
If the fault is eliminated?
Y
Installation and Maintenance
Service Manual
damage?