Troubleshooting is a process of identifying problems, determining their causes, and finding solutions. For high performance liquid chromatography (HPLC), there are many potential sources of errors including instrumental issues, procedural problems, and human errors. This can result in symptoms like changes in retention time, peak issues, baseline abnormalities, and pressure fluctuations. Troubleshooting HPLC issues involves preliminary checks, examining the column and fittings for leaks, and investigating potential causes of different problem symptoms to resolve them.