While specific to the control board

it is the central microprocessor-based brain for specific Carrier

or the main burner failing to light even when the pilot is on

The Maxitrol SC11S-B is a professional-grade analog signal conditioner designed for precise gas modulation control in both direct and indirect-fired HVACR systems

Standardized Compatibility: Direct OEM cross-reference for the L4064A series

Lennox 54M90 Orifice 323269-701 While specific to the controlThe Lennox 54M90 LP Orifice is a critical metering component designed for precise gas to propane conversion in compatible Lennox heating units. Engineered for durability and high tolerance performance, this 0. 034 inch orifice ensures steady pressure regulation and fuel flow, preventing common combustion issues such as soot buildup or irregular flame patterns. For contractors performing a Lennox furnace LP conversion, using OEM spec orifices is