1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of the ICM Controls ICM281 Furnace Control Board. The ICM281 is a direct replacement for various OEM models, including Carrier CES0110057-xx series control boards, designed to restore proper functionality to your furnace system. Please read this manual thoroughly before attempting any installation or service.
2. Safety Information
WARNING: Installation and servicing of heating, ventilation, and air conditioning (HVAC) equipment can be hazardous and requires specialized knowledge and training. Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury, or loss of life. Always consult a qualified HVAC technician for assistance if you are unsure about any procedure.
- Always disconnect all power to the furnace before installing or servicing the control board. Failure to do so can result in electrical shock or death.
- Verify that the replacement board is compatible with your specific furnace model.
- Wear appropriate personal protective equipment (PPE), including safety glasses and gloves.
- Ensure all wiring connections are secure and correctly terminated to prevent short circuits or malfunctions.
- Do not bypass any safety devices or controls.
3. Product Overview
The ICM Controls ICM281 is a robust and reliable replacement control board for various furnace systems. It is designed to provide precise control over furnace operations, including ignition, blower motor, and gas valve functions. This board often includes diagnostic LEDs to assist with troubleshooting.
Figure 3.1: The ICM Controls ICM281 Furnace Control Board. This green circuit board features various electronic components, including multiple relays, integrated circuits, and terminal connections for furnace wiring.
4. Specifications
| Feature | Value |
|---|---|
| Model Number | ICM281 |
| Brand | ICM Controls |
| Voltage Range (Line) | 98 to 132 VAC @ 60Hz |
| Ignitor Output | 5A @ 120 VAC |
| Cool Blower Output | 30A, 2HP, 240 VAC |
| Inducer Motor Output | 4A, FLA-8.0 LRA @ 120 VAC |
| Gas Valve Output | 1.5A @ 30 VAC |
| Product Dimensions | Approximately 9.2 x 9.1 x 2.2 inches (9"D x 9"W x 2"H) |
| Controller Type | Thermostat Control |
| Special Feature | Low Voltage |
5. Installation
Before beginning installation, ensure you have read and understood the safety information in Section 2. It is highly recommended to take photographs of the existing wiring connections on your old control board before disconnecting any wires. This will serve as a valuable reference during the installation of the new ICM281 board.
Installation Steps:
- Power Disconnection: Locate the main power switch for your furnace and turn it OFF. Additionally, turn off the circuit breaker supplying power to the furnace. Verify power is off using a voltage tester.
- Access Old Board: Open the furnace access panel to expose the existing control board.
- Document Wiring: Carefully label each wire connected to the old control board. Take clear photos of the wiring configuration from multiple angles.
- Disconnect Wires: Disconnect all wires from the old control board.
- Remove Old Board: Unscrew or unclip the old control board from its mounting location.
- Install New Board: Mount the new ICM281 control board in the same location as the old board, securing it with screws or clips.
- Connect Wires: Reconnect all labeled wires to the corresponding terminals on the new ICM281 board, using your photos as a guide. Ensure all connections are tight and secure. Pay close attention to polarity for power connections (L-N).
- Close Access Panel: Once all connections are verified, close the furnace access panel.
- Restore Power: Turn on the circuit breaker and then the main power switch for the furnace.
- Test Operation: Set your thermostat to call for heat to initiate the furnace's startup sequence and verify proper operation.
6. Operation
Upon successful installation and power restoration, the ICM281 board will manage the furnace's operational cycles based on thermostat demands. The board is designed to replicate the functionality of original equipment manufacturer (OEM) boards, ensuring seamless integration into your existing HVAC system.
The ICM281 board typically features a diagnostic LED that provides visual feedback on the furnace's status and any detected fault conditions. Refer to the troubleshooting section for interpreting these LED codes.
7. Maintenance
The ICM281 furnace control board is designed for long-term reliability and generally requires minimal maintenance. However, periodic inspection of the furnace system can help ensure its continued optimal performance.
- Annual Inspection: It is recommended to have a qualified HVAC technician perform an annual inspection of your furnace, including the control board and its connections.
- Dust and Debris: Ensure the area around the control board is free from excessive dust and debris, which can accumulate over time and potentially affect performance. Use a soft brush or compressed air to gently clean the board if necessary, ensuring power is disconnected first.
- Wiring Integrity: Periodically check all wiring connections to the board for tightness and signs of wear or corrosion.
8. Troubleshooting
The ICM281 control board is equipped with a diagnostic LED that flashes codes to indicate specific operational statuses or fault conditions. Observing these flash codes can help diagnose issues with your furnace. Always disconnect power before inspecting or attempting repairs.
Common Diagnostic LED Codes and Solutions:
| LED Flash Code | Indication | Possible Solution |
|---|---|---|
| Slow Continuous Flash | Normal operation, no call for heat/cool. | No action required. |
| Rapid Continuous Flash | Reversed polarity (L-N). | Check line and neutral wiring connections to the board and power supply. Correct polarity. |
| 1 Flash | Ignition lockout. | Check gas supply, ignitor, flame sensor, and gas valve. Reset power to clear lockout. |
| 2 Flashes | Pressure switch stuck open. | Check pressure switch hose, vent system for blockages, and inducer motor operation. |
| 3 Flashes | Pressure switch stuck closed. | Check pressure switch wiring, and ensure switch opens when inducer motor is off. |
| 4 Flashes | Limit circuit open. | Check furnace filter, blower motor, and all limit switches for continuity. Ensure proper airflow. |
| 5 Flashes | Flame sensed with no call for heat. | Check flame sensor for short to ground or faulty gas valve. |
| Continuous ON | Internal control fault. | Disconnect power for 30 seconds and restore. If fault persists, the board may need replacement. |
Note: This table provides common codes. Always refer to the specific documentation provided with your ICM281 board for a complete list of diagnostic codes and their meanings. If you are unable to resolve an issue, contact a qualified HVAC technician.
9. Warranty and Support
ICM Controls products are manufactured to high standards and are typically backed by a manufacturer's warranty. For specific warranty terms and conditions, please refer to the documentation included with your product or visit the official ICM Controls website. For technical support or further assistance, contact ICM Controls customer service.
