ICM291

Carrier Replacement Boards

Furnace Control Boards

ICM291

Specifications Literature Replaces

Carrier OEM Replacement Control

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. Fault code information can be found in the application guide. Please refer to the application guide with the furnace installation manual for future reference.

Specifications Literature Replaces

Input:

Control Voltage: 24 VAC (18-30 VAC), 60 Hz
Line Voltage: 208/230 VAC, 60 Hz

Timing:

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

LED Indicators:

Red LED:
- Steady ON – Normal operation
- Flashing – fault codes

Flashing-fault codes Inputs:

Power: RT and C
Thermostat Interface: R,W, and G
Safety Switches: RS, LS, and CS
Combustion Motor Hall Effect Sensor

Flame Sensing Outputs:

Spark – Gas Valve: GV
Combustion Motor: CM
Blower Motor: BM
Indoor Fan Motor: IFO

Weight/Dimensions

Weight: 0.5
Height: 1.875″
Width: 7″
Length: 5″

Sell Sheet

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Application/Install Guide

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Carrier: LH33WP003, LH33WP003A