Carrier 619FB Service Manual page 43

10. Diagnosis process for outdoor communication circuit.
Start
Test voltage
value with Test
10 position in
diagram with
voltage meter
Number jumping
Yes
Test voltage
value with Test
13 position in
diagram with
voltage meter
Yes
Number jumping
Yes
Test voltage
value with Test
11 position in
diagram with
voltage meter
Number jumping
Yes
Test voltage
value with Test
12 position in
diagram with
voltage meter
Number jumping
Yes
The circuit of
outdoor unit
communication
is normal
No
No
Outdoor unit
malfunction
No N
No
Fig. 46 – Troubleshooting
43
End