White-Rodgers 50A55-843 Ignition Furnace Control Kit

Ignition Furnace Control Kit — White-Rodgers 50A55-843 — delivers reliable ignition and precise furnace control for residential systems. This universal, integrated control supports a wide range of gas furnaces and fuel types, making it a flexible replacement part for aging equipment.

Designed as a universal ignition control with a Silicon Carbide (SiC) igniter, it ensures fast, dependable starts while extending component life. The unit uses a 1-trial ignition sequence with a 4-second ignition window and a 30-second prepurge to maximize safety and efficiency during startup.

With a broad operating range of -40 to 175°F, compatible relays for igniter, inducer, and circulator, and clear Flash Code Diagnostic capabilities, this kit provides reliable performance in demanding conditions. It supports natural, LP, and mixed gas air mixtures and operates at 25V AC with 50/60 Hz power.

• Universal, integrated furnace control for diverse gas furnaces
• Silicon Carbide (SiC) igniter for reliable ignition
• 1-trial ignition with a 4-second ignition time
• 30-second prepurge for safer startup
• Fuel compatibility: natural gas, LP gas, and mixtures
• Flash Code Diagnostic included for quick troubleshooting
• Relays supported: igniter, inducer, and circulator