John Wood
FVIR Safety System Lockout
John Wood FVIR gas water heater shuts off and will not relight after suspected flammable vapor event
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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
Activated flammable vapor sensor or thermal device, Clogged flame arrestor, Damaged burner assembly
How to Fix / Troubleshooting
Safety: Do not attempt to operate the heater if flammable vapors are present. Eliminate the source of vapors first.
- 1. Inspect flame arrestor: At the base of the heater, clean the flame arrestor screen with a soft brush and vacuum.
- 2. Check FVIR device: Many John Wood FVIR models use a one-time-use device that, once activated, requires replacement of the burner and/or gas control assembly. Consult the model-specific manual.
- 3. Replace burner assembly: If the FVIR device is non-resettable, install a new OEM burner assembly and any associated sensors.
- 4. Prevent recurrence: Store flammable liquids away from the heater and ensure adequate ventilation.
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Repair Difficulty
Professional Required
5/5
Required Part
FVIR Burner Assembly
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