Carrier 38QUS012D8S - Page 122

Troubleshooting
Electrical Control System 120
2.4.4.2 Compressor Speed Malfunction/ Zero Speed Protection / Synchronous Fault Protection
LED1(Green) off/LED2(Red) flash
or LED1(Green) flash/LED2(Red) on
LED1(Green) off/LED2(Red) flash
or LED1(Green) flash/LED2(Red) on
Is there at least one LED in
the compressor driven chip
light?
Is there at least one LED in
the compressor driven chip
light?
Check the signal wire between
the compressor driven chip and
the compressor. Is it connected
properly?
Check the signal wire between
the compressor driven chip and
the compressor. Is it connected
properly?
Reconnect and retry. Is the
error still displayed?
Reconnect and retry. Is the
error still displayed?
Replace the outdoor main
PCB. Is the system running
normally?
Replace the outdoor main
PCB. Is the system running
normally?
Replace the compressor
Replace the compressor
No
No
Yes
No
Yes
Problem is resolved
Problem is resolved
No
Yes
Yes