How to Clear Flammable Vapor Sensor Code on AO Smith Water Heater

To clear a flammable vapor sensor code on an AO Smith smart valve water heater, reset the unit by turning off power for 30 seconds, then restore power.

Seeing a flammable vapor sensor code on your AO Smith Smart Valve water heater can be alarming. This safety feature detects dangerous gas buildup, but false alarms happen. Learn how to properly reset the system and prevent future errors.

Clear flammable vapor sensor code on AO Smith heater

Understanding the Flammable Vapor Sensor System

AO Smith’s Intelli-Vent technology includes a sensitive vapor detection system. When activated, it shuts down the water heater to prevent potential explosions. The system monitors for:

  • Gasoline fumes
  • Paint thinner vapors
  • Other hydrocarbon-based compounds

Common Causes of False Alarms

Many sensor triggers aren’t actual hazards. Typical false alarm sources include:

Source Solution
Recent painting near unit Ventilate area for 24 hours
Cleaning products storage Relocate chemicals away from heater
Garage parking with engine running Keep vehicle exhaust away
Step by step reset flammable vapor sensor code

Step-by-Step Reset Process

Follow these steps to clear the sensor code safely:

  1. Turn off power at circuit breaker
  2. Wait 5 full minutes
  3. Restore power
  4. Check for normal operation

If the code persists, consult the HVAC technician tools guide for diagnostic equipment recommendations.

When Manual Reset Doesn’t Work

Persistent codes may indicate:

  • Faulty sensor needing replacement
  • Control board issues
  • Actual vapor presence

For complex issues, consider using a multimeter to test electrical components.

Preventing Future Sensor Codes

Proper Water Heater Location

Installation guidelines recommend:

  • Minimum 18″ clearance from floor
  • No storage within 12″ of unit
  • Well-ventilated space

Regular Maintenance Tips

Keep your system running smoothly with:

  1. Annual professional inspection
  2. Monthly visual checks
  3. Immediate spill cleanup
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For more on home temperature systems, see our guide on water heater efficiency from the Department of Energy.

When to Call a Professional

Seek expert help for:

  • Repeated sensor activations
  • Burner ignition failures
  • Unusual gas odors

Always prioritize safety when dealing with gas appliances. The Consumer Product Safety Commission provides additional resources for gas appliance safety.

Joye
Joye

I am a mechanical engineer and love doing research on different home and outdoor heating options. When I am not working, I love spending time with my family and friends. I also enjoy blogging about my findings and helping others to find the best heating options for their needs.