Bradford White Water Heater Error Code 3 Flash: How to Fix It
Medium 1-2 hours (including waiting period) Critical Severity
Verified June 2026
- Error Code
- 3 Flash
- Brand
- Bradford White
- Product Type
- water_heater
- Severity
- Critical
- DIY Difficulty
- Medium
- Estimated Fix Time
- 1-2 hours (including waiting period)
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Tools You'll Need
- Gas leak detector solution
- Soft cleaning cloth
- Flashlight or work light
How to Fix Error Code 3 Flash
-
Turn off the water heater immediately
Never ignore this error code as it indicates a potentially dangerous situation with flammable vapors present. -
Remove all flammable materials from the area
Ensure adequate ventilation and avoid using electrical switches or creating sparks while cleaning. -
Ventilate the area thoroughly
Do not use electrical fans near the water heater if flammable vapors are still present. -
Inspect the FV sensor
Do not use compressed air or cleaning chemicals on the sensor as this can damage it. -
Check for gas leaks
If you detect any gas leaks, do not attempt repairs yourself. Call a licensed gas technician immediately. -
Wait for the lockout period to expire
Do not attempt to bypass or reset the sensor during the lockout period. -
Reset the water heater
If the 3 flash code returns immediately, do not continue operating the unit.
Parts You May Need
FV (Flammable Vapor) sensor
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Gas control valve
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FV (Flammable Vapor) sensor
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Gas control valve
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FV (Flammable Vapor) sensor
Check Price on Amazon
Gas control valve
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FV (Flammable Vapor) sensor
Check Price on Amazon
Gas control valve
Check Price on Amazon
FV (Flammable Vapor) sensor
Check Price on Amazon
Gas control valve
Check Price on Amazon
FV (Flammable Vapor) sensor
Check Price on Amazon
Gas control valve
Check Price on Amazon
FV (Flammable Vapor) sensor
Check Price on Amazon
Gas control valve
Check Price on Amazon
FV (Flammable Vapor) sensor
Check Price on Amazon
Gas control valve
Check Price on Amazon
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When to Call a Professional
Call a professional if the error code persists after following all steps, if you detect gas leaks, if the FV sensor appears damaged, or if you're uncomfortable working with gas appliances. A licensed technician should handle FV sensor replacement or gas line repairs.Frequently Asked Questions
What does the 3 flash code mean on my Bradford White water heater?
The 3 flash code indicates an FV (Flammable Vapor) sensor lockout. This means your water heater detected potentially dangerous flammable vapors in the air and shut down as a safety precaution.
How long does the Bradford White FV sensor lockout last?
The FV sensor lockout typically lasts for 1 hour after the flammable vapors are no longer detected. You must wait for this full period before attempting to restart the water heater.
Can I bypass the FV sensor on my Bradford White water heater?
No, you should never bypass the FV sensor as it's a critical safety feature. Bypassing it could result in dangerous conditions including fire or explosion hazards.
What causes Bradford White water heater FV sensor to trigger?
Common causes include gasoline vapors, paint fumes, cleaning chemicals, solvents, adhesives, or any volatile organic compounds stored near the water heater. Even small amounts can trigger the sensitive sensor.
How much does it cost to replace a Bradford White FV sensor?
Professional FV sensor replacement typically costs between $150-300 including parts and labor. The sensor itself usually costs $50-100, but replacement requires a qualified technician due to gas safety concerns.