Save the useful observations
From a safe position, record the model, serial number, and any visible status-light pattern. Photograph the heater's existing instruction label without removing covers.
Note when the pilot goes out: during heating, after a hot-water draw, in windy weather, or after nearby work. Tell the provider if you noticed an unusual flame, exhaust odor, soot, or a previous gas-control repair.
A light pattern can help direct a model-specific investigation. It does not establish that the whole installation is safe.
Ask for combustion and installation review
The qualified technician should use the exact model's service information to assess the pilot system, controls, fuel supply, combustion air, and venting as relevant. Request the actual findings and any test limitations.
Do not clean or replace pilot parts, adjust gas pressure, bypass a protective control, or change venting yourself. Those actions need qualified work and applicable manufacturer instructions.
If the provider recommends a part, ask how the diagnosis supports that choice. A pilot outage alone is not enough evidence to choose a new gas valve or a new heater.
Plan for the interruption
Ask the provider whether the equipment should remain off pending inspection and how to follow the exact model's shutdown directions safely. If you cannot identify the controls or approach safely, leave that to the provider.
Arrange another way to meet essential bathing and washing needs while service is pending. Do not use a heater with unresolved combustion concerns simply because hot water is inconvenient to lose.
Your next step is to contact a qualified gas water-heater technician with the model, light pattern, and outage history. Request a written cause and verified repair result before returning to routine use.