White Rogers 50M56U-843 board only replacement. See the ICM2812-KIT for board with harnesses, making it a universal replacement for over 200 SKU’s. The ICM2812 is a board only replacement for the White-Rodgers 50M56U-843. Hot Surface Ignition (HSI) control board Microprocessor-based Monitors timing, trial for ignition, system switches, flame sensing and lockout. 100% lockout safety feature Compatible with LP or Natural Gas LED indication for status and fault codes to aid in troubleshooting SPECIFICATIONS Electrical Control voltage: 24 VAC (18-30 VAC) Line voltage: 120 VAC Operating temperature: -40˚to 175˚F (-40˚to 80˚C) HSI Hot Surface Ignitor: 6 amp @ 120 VAC Gas Valve: 1.5 amp @ 24 VAC Inducer draft motor: 2.2 FLA @120 VAC Blower motor: 14.5 FLA @ 120 VAC Environmental Operating Temp Range: -40° to 176°F (-40° to 80°C) Humidity Range: 5 to 95% relative humidity (non-condensing)