100870-01 | Lennox SureLight Two-Stage Variable-Speed Furnace Control Board

Lennox · HVAC & Building Controls

Description  The Lennox 100870-01 SureLight control board is a furnace control module designed for two-stage, variable-speed ignition systems. It manages essential furnace operations—including ignition sequencing, blower control, and flame sensing—while facilitating diagnostic feedback through LED indicators.     Technical Specifications  Condition New/Never Used Surplus Brand Lennox Category Furnace Control Boards Part Number 100870-01 Subcategory SureLight Two-Stage Variable-Speed Control Boards Heating Stages Two-stage Blower Control Variable-speed Diagnostic Features LED fault code indicators Accessory Terminals EAC (electronic air cleaner), HUM (humidifier) Configuration Options DIP switches and jumpers Compatibility Select Lennox furnace models Installation Direct replacement, no rewiring Dimensions 6 × 6 × 6 inches Weight 1 lb (0.45 kg)   Information About 100870-01 The 100870-01 is part of Lennox’s SureLight series, developed to offer reliable ignition and blower management for advanced furnace configurations. This board coordinates the full heating cycle, including ignition timing, flame verification, and blower motor control, ensuring optimal performance and safety. It features LED diagnostic indicators to simplify fault detection, as well as terminals for connecting accessories such as electronic air cleaners and humidifiers. Designed for direct replacement compatibility with select Lennox models, it allows straightforward installation without rewiring, and its durable construction ensures long-term operation in demanding furnace environments. Key Features: Two-stage heating capability: Controls both low and high heating stages for improved efficiency and comfort. Variable-speed blower control: Adjusts airflow dynamically to match heating demand and maintain consistent temperatures. LED diagnostic indicators: Provides real-time fault codes for fast troubleshooting and reduced downtime. Accessory terminal integration: Supports direct connection for electronic air cleaners and humidifiers. Configurable system settings: Includes DIP switches and jumpers for customizing fan delay, thermostat staging, and cycle timing. Direct OEM replacement: Matches original specifications for Lennox systems, ensuring seamless compatibility. Compact and lightweight: Measures approximately 6 × 6 × 6 inches and weighs around 1 pound for easy installation. The 100870-01 delivers the reliability and precision required for safe and efficient operation of two-stage, variable-speed Lennox furnace systems.

Brand: Lennox · Category: HVAC & Building Controls

Key features

• Two-stage heating capability: Controls both low and high heating stages for improved efficiency and comfort.
• Variable-speed blower control: Adjusts airflow dynamically to match heating demand and maintain consistent temperatures.
• LED diagnostic indicators: Provides real-time fault codes for fast troubleshooting and reduced downtime.
• Accessory terminal integration: Supports direct connection for electronic air cleaners and humidifiers.
• Configurable system settings: Includes DIP switches and jumpers for customizing fan delay, thermostat staging, and cycle timing.
• Direct OEM replacement: Matches original specifications for Lennox systems, ensuring seamless compatibility.
• Compact and lightweight: Measures approximately 6 × 6 × 6 inches and weighs around 1 pound for easy installation.

Specifications

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