troubleshoot
verb [ I or T ]
uk/ˈtrʌblˌʃuːt/ ustroubleshot | troubleshotto try to solve problems for a person or organization:
She meets daily with various stakeholders to troubleshoot any issues or potential problems.
to try to find the cause of a product or system not working correctly, especially one involving a piece of equipment or machine, and try to find the solution:
Service technicians will continue to learn about and troubleshoot the equipment.
The company's help site explains how to set up and troubleshoot your DSL modem.
troubleshooting
noun [ U ]
If you have any queries there is a menu for troubleshooting on the website.