Ao Smith 100110707 Flame Sensor Legend 1000

Product Description

The AO SMITH 100110707 is a replacement flame sensor designed for use in the Legend 1000 water heater. The flame sensor monitors combustion activity within the burner assembly, sending a signal to the control board to confirm that ignition has occurred and that the burner is operating safely. If the sensor fails to detect a flame, the control board shuts down the burner to prevent unburned gas accumulation. This part is installed by licensed plumbers and HVAC technicians performing diagnostics or preventive maintenance on water heating equipment.

This flame sensor is a direct replacement component for the AO SMITH Legend 1000 water heater platform. It is appropriate for residential or light commercial service calls where the original sensor has failed, corroded, or produced nuisance lockout faults. Technicians typically replace this part when the unit cycles off on flame-loss fault codes despite confirmed ignition, indicating a weak or failed sensor signal.

Key Features

• OEM-style replacement flame sensor for the Legend 1000 platform
• Restores proper flame detection and burner safety shutoff function
• Direct drop-in fit eliminates need for field modification
• Designed to work with the existing control board and ignition circuit

Compatibility

Designed as an OEM-style replacement flame sensor for the AO SMITH Legend 1000 water heater.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician. Before servicing, shut off the gas supply and disconnect electrical power to the unit. The flame sensor is typically secured with a single fastener and connects via a low-voltage signal wire to the control board. Ensure the sensor rod is clean and positioned correctly in the burner flame path before restoring power.

Technical Specifications

• Application: Replacement Part

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100110707