Monitors timing, trial for ignition, flame sensing and lockout Carrier/Bryant/Payne LH33WP003 HVAC Furnace Replacement Ignition Control Module 02 Egm Icm Controls Icm291 Replacement HSI Control Board Direct Spark Ignition Control This Direct Spark Ignition (DSI) control board, microprocessor-based, controls combustion, blower and indoor motors, and spark Low cost form, fit and functional replacement for Carrier: LH33WP003A The ICM291 control is low cost form, fit and functional replacement board for Carrier: LH33WP003A circuit boards. It controls inducer fan motor, blower fan and monitors limit switches. The ICM291 has incorporated LED diagnostics to assist in troubleshooting 'Furnace Control Board, OEM Replacement, Input Voltage 208/230, 24 Control Volts, For Use With Residential, Commercial HVAC Equipment, Replaces Carrier LH33WP003 (DSI Control Board)