- Chromatogram shows merged peaks as opposed to individual peaks
- ACQUITY UPLC H-Class Bio
- ACQUITY UPLC H-Class PLUS Bio
- ACQUITY UPLC FLR Detector
The active preheater is set to active, disabled.
FIX or WORKAROUND
Set the active preheater to active.
Console > Sample manager/column manager > Configure > Preheaters > [choose "active"]
Also ensure that the instrument method states either "console" or "active".