The individual at work installs the newly purchased UPS or inverter and interacts with customers to diagnose the problems, assess possible causes, rectify faults or replace faulty modules or recommends factory repairs for bigger faults. A technician is a skilled employee who repairs, installs, replaces, and services various types of equipment and systems. Each day, a technician spends time tackling different tasks, depending on the issue, such as analyzing problems, running tests, and repairing equipment.