ICM291 ICM Furnace Control Board Module for Carrier Bryant LH33WP003 LH33WP003A. ICM Controls Fan Blower Control Board Part Number ICM291. This board is a replacement for the following numbers. Low cost form, fit and functional replacement for Carrier: LH33WP003A. Direct Spark Ignition (DSI) control board. Controls combustion, blower and indoor fan motors; spark ignitor; and the gas valve. Monitors timing, trial for ignition, flame sensing and lockout. 100% lockout safety feature. Compatible with LP or Natural Gas. Status LED for fault. Control Voltage: 24 VAC (18-30 VAC), 60Hz. Line Voltage: 208/230 VAC, 60Hz. Pre-Purge: 45 seconds. Trial for Ignition: 5+2 seconds. Retry Period: Every 20 seconds for 15 minutes. Lockout: Manual reset. Post-Purge: 45 seconds. Red LED: Steady ON-normal operation. Power: RT and C. Thermostat Interface: R, W, and G. Safety Switches: RS, LS, and CS. Combustion Motor Hall Effect Sensor. Spark – Gas Valve: GV. Combustion Motor: CM. Blower Motor: BM. Indoor Fan Motor: IFO. Complete with installation guide. Please see all pictures. Fan Blower Control Board. This board is a replacement for the following numbers: Carrier: LH33WP003, LH33WP003A. Control Voltage: 24 VAC (18-30 VAC), 60Hz Line Voltage: 208/230 VAC, 60Hz. Check out my other items.