Most covered visits stay with a single technician. Some do not. A diagnosis may show that the fix needs a licensed electrician, a gas fitter, or a plumber, and the contract may not let the visiting technician do that work. Knowing the sequence in advance keeps the job from stalling halfway through.
Before the trade starts, ask whether the work counts toward the annual cap, the most a provider will spend on covered repairs during one contract year. Trade work can draw down that limit faster than a part swap, so the question is worth asking early.
First, have the technician name the trade in writing on the visit report, along with the part and the reason for the referral. A vague note such as needs further work gives you nothing to show the next person.
Next, ask the provider how it routes the trade. Some send their own licensed trade. Others ask you to hire a trade and then approve the invoice under the contract terms. Get that route in writing before any work begins, since work started without approval may not be credited under the contract.
Then check local requirements. Some electrical and gas work needs a permit and an inspection. The contract may say nothing about those steps, so confirm them with your local building office before the trade arrives.
Keep the record from start to finish. Save the visit report, the trade's invoice, any permit number, and any photographs. Those papers are what make a later question easy to answer.
If the technician says an appliance is unsafe to run, follow that instruction and do not run it until a qualified person clears it. This is general safety guidance, not advice about your particular equipment.
A sample contract on this site can show where a typical contract places trade routing, so you know what to look for before a visit happens. You can read the sample contracts at the sample contract list.