ABB A8C4 fault code meaning
ABB / A8C4
Series: ACH580
ULC underload warning
drive
Meaning: User load curve: The signal has remained below the underload curve for too long.
Possible causes
Source: ACH580 HVAC Control Program Firmware Manual P282
Series: ACS180, ACS280, ACS380
ULC underload warning
drive
Meaning: User load curve; the signal has remained below the underload curve for too long.
Possible causes
Source: ACS180 Machinery Control Program Firmware Manual P318; ACS280 Firmware Manual P337; ACS380 Machinery Control Program Firmware Manual P433