Gree GWH18AC-D3DNA1B Service Manual page 57

Troubleshooting
Diagnosis process for outdoor communication circuit: (refer to key test point of outdoor unit):
Start
Test voltage
value with Test
10 position in
diagram with
voltage meter
Number jumping
Y
Test voltage
value with Test
15 position in
diagram with
voltage meter
Y
Number jumping
Y
Test voltage
value with Test
11 position in
diagram with
voltage meter
Number jumping
Y
Test voltage
value with Test
12 position in
diagram with
voltage meter
Number jumping
Y
The circuit of
outdoor unit
communication
is normal
N
N
Outdoor unit
malfunction
N
N
54
Finish