Before replacing the board, count the LED blinks — the error code tells you what actually failed. Sometimes it’s a $15 fuse, not a $140 board.
LH33WP003 – CONTROL BOARD (RTU, CARRIER, AFTERMARKET, DIRECT, ICM291)
$320.67
ICM291 direct spark ignition control board. Aftermarket replacement for Carrier LH33WP003. Used in Carrier rooftop units and furnaces to control the ignition sequence.
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm | In-Store Pickup Only
Description
If your furnace won’t ignite, shows error codes, or the blower won’t start, the control board controls all of it. The ICM291 is an aftermarket replacement for the Carrier LH33WP003 direct spark ignition (DSI) control board used in rooftop units and furnaces. Controls the ignition sequence, gas valve, and blower operation.
Specs: Direct spark ignition control board, aftermarket replacement
Replaces: 1171166, LH33WP003
Fits: Carrier rooftop units (RTUs) and furnaces using the LH33WP003 control board
Need help? See our Furnace Not Heating Guide.
In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.
