Lennox 19B48 indoor control board, part number 17122000A20230, is an original OEM electronic control board designed to manage and coordinate critical furnace and air handler functions. This board controls ignition sequence, blower operation, safety monitoring, and system timing to ensure reliable and efficient HVAC performance. Designed and tested by Lennox, it meets exact factory specifications for compatibility, durability, and long-term operation.

 

Product overview:

The Lennox 19B48 indoor control board serves as the central control module for compatible Lennox gas furnaces and air handling units. It processes thermostat signals and coordinates system components such as the blower motor, ignitor, gas valve, and safety switches. Replacing a failed or damaged control board with this OEM part helps restore proper system operation, prevents nuisance shutdowns, and maintains manufacturer-recommended performance standards.

This control board is commonly used to resolve issues such as no heat, intermittent operation, blower malfunctions, or fault code errors related to electronic control failure. OEM construction ensures correct pin configuration, voltage handling, and reliable communication with other furnace components.

 

Specifications:

Manufacturer Lennox
Part number 19B48
Alternate part number 17122000A20230
Product type indoor control board
Function furnace and air handler system control
Application residential and light commercial HVAC systems
Mounting direct replacement OEM board
Electrical rating factory matched to Lennox specifications
Compatibility designed for specific Lennox furnace and air handler models