Technician arrived on site to address a gas water heater that was not lighting. Inspected gas supply, confirmed proper gas pressure, and checked the shutoff valve to ensure it was fully open. Examined the pilot assembly and thermocouple for debris or damage. Safely relit the pilot and verified stable flame. Cycled the unit to confirm proper ignition and burner operation. Ensured the water heater was heating correctly before leaving the job site. Customer was advised on basic pilot relighting steps and safety precautions.