HPLC & UHPLC Troubleshooting Hub — ChemITrust AI
 

High-Performance Liquid Chromatography (HPLC) and UHPLC issues are rarely random. Most failures follow repeatable patterns linked to pressure behavior, baseline stability, degassing/bubbles, peak shape, and hardware restrictions. This pillar page consolidates ChemITrust AI’s most useful troubleshooting guides and tools into one structured hub so you can diagnose problems faster—and so search engines can understand your topic authority.
 

Jump to a Section

• Systematic troubleshooting workflow

• Pressure issues and high backpressure

• Baseline drift, noise, and oscillations

• Air bubbles, degassing, and cavitation

• Peak shape failures (tailing, fronting, splitting, broadening)

• Logging and documentation

• When to stop troubleshooting and call service

• Interactive tool: Backpressure estimator

• LC-MS cross-links (when LC problems show up as MS problems)
   

Systematic Troubleshooting Workflow (Start Here)

Before adjusting multiple variables, use a structured “one change at a time” approach to isolate the root cause.

Start here: Systematic Troubleshooting Process for HPLC/UHPLC Performance Issues
 

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Pressure Issues and High Backpressure

Pressure behavior is one of the highest-value diagnostic signals in LC because it often identifies restrictions, clogging, or downstream hardware limits.

• Why is my HPLC pressure suddenly high (high backpressure)?
   

• Detector Outlet Restrictions and Artificial Backpressure in HPLC
   

• Guard Column Blockage and Rising Backpressure in HPLC
   

• Related interactive tool:

• HPLC Backpressure Estimator (Kozeny–Carman model)
   

Baseline Drift, Noise, and Oscillations

Baseline instability can originate from temperature changes, solvent absorbance effects during gradients, mixing ripple, pump pulsation, and/or gas in the flow path.

• Baseline Drift Caused by Detector Temperature Instability
   

• What causes baseline drift in HPLC, especially during gradients?
   

• Why is my baseline noisy or wavy during blanks or long runs?
   

• Pulse Dampener Failure and Baseline Oscillations in HPLC
   

Air Bubbles, Degassing, and Cavitation

Bubbles and poor degassing can mimic pump failure, detector noise, and even method instability. This cluster should be heavily cross-linked because symptoms overlap with pressure and baseline problems.

• How do air bubbles and poor degassing affect pressure and baseline stability?
   

• Air Bubbles in HPLC Solvent Lines: Symptoms, Detection, and Fixes
   

• Pump Cavitation in HPLC: Causes, Symptoms, and Solutions
   

• Helium Sparging vs In-Line Degassing in HPLC Systems
  
   

Peak Shape Failures: Tailing, Fronting, Splitting, Broadening

Peak shape is a fast diagnostic indicator of system health and method appropriateness.

• Why are my peaks tailing, fronting, splitting, or broad?
   

• Peak Tailing in HPLC Caused by Active Silanol Sites
  
   

Logging and Documentation (Improves Troubleshooting Speed)

Instrument logs prevent repeated failure cycles and reduce time-to-root-cause.

• Importance of Instrument Logs in HPLC Troubleshooting
   

When to Stop Troubleshooting and Call Technical Service

Some failures should be escalated to protect columns, pumps, and detectors.

• When to Stop HPLC Troubleshooting and Call Technical Service
   

LC-MS Cross-Links (When LC Problems Become MS Problems)

LC instability often manifests in MS as TIC noise, elevated background, or reduced sensitivity.

• Understanding Ion Suppression in LC-MS
   

• Ion Suppression in LC-MS Caused by Mobile Phase Additives
   

• What causes high background in LC-MS and reduced sensitivity?