Fedders GWH18MC-D3DNA1A/O, Service Manual, Page: 60 / 73

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(9) Flow chart for outdoor communitcation circuit detecting:
Start
Measure voltage at the
Test 10 position as
shown in the diagram
with a voltmeter
Value jumping
Measure voltage at the
Test 15 position as
shown in the diagram
with a voltmeter
Value jumping
Measure voltage at the
Test 11 position as
shown in the diagram
with a voltmeter
Value jumping
Measure voltage at the
Test 12 position as
shown in the diagram
with a voltmeter
Value jumping
The communication
circuit of the outdoor
unit is normal
End
Fault with
outdoor unit
Troubleshooting