FVS
Rheem
Flammable Vapor Sensor (FVS) Lockout
Rheem FVIR gas tank water heater status light flashes indicating flammable vapor sensor lockout
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Flammable vapors detected near heater, Contaminated or failed flammable vapor sensor, Blocked combustion air intake, Control valve safety lockout
How to Fix / Troubleshooting
Safety first: If you smell gas or flammable vapors, ventilate the area and eliminate ignition sources. Do not operate the heater until the area is safe.
- Remove ignition sources: Eliminate any solvents, gasoline, or flammable liquids stored near the heater.
- Ventilate: Open doors and windows to clear vapors.
- Inspect air intake: Check the combustion air openings at the bottom of the heater for dust, lint, or debris and clean gently.
- Reset procedure: Follow the Rheem lighting and reset instructions on the rating plate. Some models require a specific sequence of knob positions to clear FVS lockout.
- If lockout persists: The flammable vapor sensor or gas control valve may need replacement. This should be done by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Flammable Vapor Sensor
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