Ao Smith 100112678 Flame Sensor

Product Description

The AO SMITH 100112678 is a flame sensor designed for use in gas-fired water heaters and heating appliances. The flame sensor monitors the burner flame signal and provides feedback to the control system, confirming ignition and enabling safe operation. Without a functioning flame sensor, the control board cannot verify combustion, causing the unit to shut down on lockout. This component is installed by licensed plumbers and HVAC technicians during routine maintenance or after a no-heat diagnostic call.

This flame sensor is suited for residential gas water heater applications where the OEM sensor has degraded, corroded, or failed to produce an adequate microamp signal. Flame sensors typically require replacement when the sensing rod is coated with oxide buildup that prevents accurate flame detection, resulting in nuisance lockouts or failure to light.

Key Features

• OEM-style flame sensor rod for accurate flame signal detection
• Direct replacement designed to restore proper burner operation and lockout prevention
• Compatible with gas-fired appliance control systems that rely on microamp flame sensing
• Durable construction suited for high-temperature burner environments

Compatibility

Designed as an OEM-style replacement flame sensor for AO SMITH gas-fired water heaters and related heating appliances.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician. Shut off gas supply and disconnect power to the appliance before servicing any burner components. The sensing rod must be positioned correctly within the burner flame path to achieve an adequate microamp reading. Follow all applicable local codes and the manufacturer service documentation when replacing burner components.

Technical Specifications

• Product Type: Flame Sensor

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100112678