Carrier 38QUS012D8S Service Manual page 121

2.4.4 Outdoor Units
2.4.4.1. Compressor Driven Chip EEPROM Malfunction
Malfunction conditions
Possible causes
Compressor driven chip
Compressor driven chip
EEPROM malfunction
EEPROM malfunction
Power off, then restart the
Power off, then restart the
unit 2 minutes later. Does the
unit 2 minutes later. Does the
malfunction still remain?
malfunction still remain?
Yes
Replace the outdoor main
Replace the outdoor main
PCB
PCB
Electrical Control System
Main PCB chip does not receive feedback from EEPROM chip
● Installation mistakes
● Faulty PCB
Troubleshooting
119