Ao Smith 100074348 Control Board T-KJR2 Series

Product Description

The AO SMITH 100074348 is a replacement control board designed for use in AO SMITH water heating systems. The control board manages the operational logic of the unit, coordinating ignition, temperature regulation, and safety functions. This part is a direct OEM-style replacement intended to restore proper system function when the original board fails. Licensed plumbers and HVAC technicians performing water heater service are the primary installers of this component.

This control board is specified for use with AO SMITH T-KJR2 series units in both indoor and outdoor configurations, covering liquid propane (LP) and natural gas (NG) fuel types. Applicable models include the T-KJR2-OS (LP), T-KJR2-IN (LP), T-KJR2-IN (NG), and T-KJR2-OS (NG). This makes it a cross-application replacement covering the core T-KJR2 product line regardless of installation location or fuel source.

Key Features

• Direct replacement control board for T-KJR2 series units
• Compatible with both LP and NG fuel configurations
• Fits indoor and outdoor model variants
• Restores OEM control logic for ignition and temperature management

Compatibility

Designed for use with the following AO SMITH models: T-KJR2-OS (LP), T-KJR2-IN (LP), T-KJR2-IN (NG), and T-KJR2-OS (NG).

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician. Shut off power to the unit and close the gas supply valve before beginning any service work. Handle the control board carefully to avoid static discharge damage to onboard components. Verify all wiring connections are secure and match the original configuration before restoring power.

Technical Specifications

• Type: Control Board
• Application: Replacement Part
• Compatible Fuel Types: LP, NG
• Compatible Configurations: Indoor, Outdoor

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100074348