State FVIR (flammable vapor ignition resistant) gas tank-type water heater status light flashes a flammable vapor (FV) error code; burner will not light.

Critical safety: If you smell gasoline, solvents, or other flammable vapors, do not attempt to relight the heater. Ventilate the area and remove the source of vapors. Do not operate the heater until the area is safe.

• Inspect surroundings: Ensure no gasoline cans, paint thinners, or other volatile chemicals are stored near the heater.
• Clean intake screen: On State FVIR models, clean the combustion air intake screen at the base of the heater with a soft brush or vacuum to restore airflow.
• Reset procedure: Follow the lighting and reset instructions on the heater's rating plate. Some models require a specific sequence of knob rotations and button presses to clear FV lockout.
• Sensor replacement: If the FV sensor has failed (open/short when tested per State specs), it must be replaced with the correct State flammable vapor sensor kit. This is typically a technician-level repair.