Lennox 49W66 Control Board Refrigerant providing a reliable solution for

providing a reliable solution for technicians addressing furnace ignition failure or nuisance system lockouts

Designed for precision HVAC blower control

For technicians performing diagnostics

Durable Construction: Built to withstand high-heat environments common in Raypak boiler maintenance and commercial heating applications

Whether used for low-ambient control or limit protection

Lennox 49W66 Control Board Refrigerant providing a reliable solution forThe Lennox 49W66 Ignition Control Board is the heavy duty OEM replacement for legacy 790 311 and 102186 01 modules. Designed for direct spark ignition (DSI) systems, this 24VAC control board is a critical integrated component for Lennox GCS16 rooftop units and commercial series. It features a 30 second pre purge cycle and an 8 second ignition trial, providing precise timing to ensure safe combustion. As a veteran grade HVAC replacement part, it