For clarification, what defines a service call? Is it fter hours, during hours but emergency service, any scheduled visit?

I installed a whole house generator on a new home I wired. I don't service them only install them and do a start up which I may cease. This generator would not start. The service tech is comming out tomorrow to look at it. $89 service call fee, $79 for first hour. Should there be a service call fee for a scheduled, nonemergency?

Just wondering? Should all be under warranty anyway.