How do I troubleshoot a tub shower diverter that is not working properly?

To troubleshoot a tub shower diverter that is not working properly, first check for any blockages or debris in the diverter valve. Next, inspect the diverter valve for any signs of wear or damage. If necessary, clean or replace the diverter valve to restore proper function. If the issue persists, consider seeking professional help from a plumber to diagnose and fix the problem.