Carrier 38QUS012D8S - Page 137

Troubleshooting
Electrical Control System 135
2.4.4.16. J4 Malfunction
Communication error between outdoor main
chip and compressor driven chip
Communication error between outdoor main
chip and compressor driven chip
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
main board, is it connected
properly?
Check the signal wire between the
Compressor driven chip and the
main board, is it connected
properly?
Reconnect and retry. Is the
error still displayed?
Reconnect and retry. Is the
error still displayed?
Replace Compressor driven
Chip. Is the system running
normally?
Replace Compressor driven
Chip. Is the system running
normally?
Replace the electric control box
Replace the electric control box
No
No
No
No
Yes
Problem is resolved
Problem is resolved
No
Yes
Replace outdoor main board.
Is the system running
normally?
Replace outdoor main board.
Is the system running
normally?
No
Yes
Yes
J4 displayed
J4 displayed