Copeland Comfort Control (White Rodgers) 3L01-170 Limit Switch

The White Rodgers 50A55-843 is a universal silicon carbide ignition control engineered for high-reliability performance across a broad range of HVAC furnace systems. This integrated furnace control board utilizes an onboard microprocessor to provide constant surveillance of the gas burner, inducer motor, and blower fan sequences. Designed as a versatile solution for furnace control board replacement, it includes an extensive cross-reference for modules from Trane, York, ICP, and Amana. The 50A55-843 universal ignition module features built-in diagnostic LED indicators to streamline field troubleshooting, allowing technicians to quickly identify system faults through specific flash codes. With selectable dip switch settings for heat-on and heat-off delays, this board offers the precise timing adjustments required to optimize furnace ignition system efficiency and ensure proper heat exchanger cooling. It is fused to protect the low-voltage transformer from field wiring shorts and includes all necessary jumpers and harnesses for simplified integration in the mechanical room.

• Universal Compatibility: Replaces a wide array of White Rodgers 50A50 and 50A55 OEM modules, reducing the need for multiple van stock items.
• Advanced Diagnostics: The multi-color diagnostic LED provides immediate feedback on system status and failure modes, such as pressure switch or lockout issues.
• Adaptive Ignition Technology: Employs an intelligent algorithm that manages ignitor warm-up times to maximize the service life of the silicon carbide ignitor.
• Enhanced System Control: Dedicated terminals for 120V accessories including electronic air cleaners and humidifiers, simplifying total system wiring.
• Field Adjustable Timing: Onboard dip switches allow for onsite customization of blower delays to match specific ductwork and airflow requirements.

• Is this board compatible with Trane furnaces requiring a jumper? Yes, the 50A55-843 includes a specific jumper wire for Trane applications. If you encounter a "5 flash" rollout error code during installation, ensure the RO1 to RO2 jumper is correctly seated.
• Can this be used with 80V or 120V ignitors? This control is specifically designed for 120V silicon carbide ignition systems. Always verify the voltage requirements of the existing ignitor before completing the swap.
• What happens if the internal fuse blows? The board features a standard automotive-style 3A fuse. If blown, it typically indicates a short in the 24V thermostat wiring or gas valve circuit that must be cleared before replacement.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.