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Communication Loss
Troubleshoot
No
Line Voltage
Replace Drive/
No
AOC
Replace Drive
No
4TWL9048A-SF-1C-EN
No AOC / MOC
(Drive) Lights
Check Line
MOC / Drive
incoming
No
lights on?
voltage
Is Line
voltage
present?
Yes
DCV > 240 VDC
at DCV test
points?
Yes
Remove A0C /
MOC COMM
harness, HPCO,
and Condenser
Fan harness.
Recheck for
voltage.
DCV > 240 VDC
Yes
at DCV test
points?
Verify 13.8 VDC
on Pins 1 & 6 in
Yes
A0C / MOC
Harness
No
A0C/MOC
Harness:
Remove HPCO
Condenser Fan
from MOC and
recheck.
13.8 VDC on
Pins 1 & 6 in
A0C / MOC
Harness?
Yes
Replace each harness one by
one and troubleshoot
grounding/shorted circuit
Replace each harness one by
one and troubleshoot
grounding/shorted circuit
Unplug 18-Pin
Harness, LSOV,
and EEV Stepper
Yes
from A0C and
recheck. MOC /
Drive lights on?
Yes
Replace AOC
Replace each harness one by
one and troubleshoot
grounding/shorted circuit
Replace Drive
No
No
33
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