IO Hvac Controls iO-CL70 Thermostat

The White-Rodgers 50M56U-843 is a versatile universal single stage HSI integrated furnace control kit designed to streamline your inventory by replacing over 200 OEM and competitive models. This microprocessor-based control provides precise management of the gas burner, inducer, and blower, ensuring reliable operation across natural, manufactured, and LP gas systems. Its universal nitride igniter kit (21D64-2) allows for seamless compatibility with both 80V and 120V igniter applications, making it a critical stock item for service calls involving Carrier, Goodman, Trane, and York systems.

For technicians in the field, the 50M56U-843 wiring harness kit includes 9 to 12 quick-connect adapters to simplify high-stakes replacements. The board supports three fan speeds (Cool, Low Heat, and High Heat) and features a red LED for diagnostic flash codes with a stored fault recall function for efficient troubleshooting. Built-in low voltage fuse protection and dedicated terminals for electronic air cleaners and humidifiers enhance system integration. With an operating temperature range of -40°F to 176°F, this furnace control board is engineered for durability in demanding mechanical environments.

• Broad Compatibility: Replaces virtually all single-stage carbide and nitride HSI systems, including specific Carrier HK42FZ series modules.
• Integrated HSI Control: Supports both 80V and 120V igniters using the included universal nitride upgrade.
• Advanced Diagnostics: Red LED provides clear fault codes, while the cover label offers a quick-reference diagnostic table.
• Installation Efficiency: Comprehensive kit includes color-coded thermostat connections and multiple quick-select harnesses to reduce time on site.
• System Protection: Includes a 3-amp replaceable automotive-type fuse to shield against low-voltage shorts.

Can this board replace a two-stage furnace control?
No, the 50M56U-843 is specifically designed for single-stage heating applications. For two-stage systems, a different universal series module is required.

What should I do if my existing inducer connector doesn't match the new board?
Utilize the provided quick-connect wiring harnesses included in the kit; these are specifically designed to bridge the gap between various OEM plug configurations and the universal board terminals.

Does this module support both silicon carbide and silicon nitride igniters?
Yes, the kit is designed to upgrade older carbide systems to the more robust nitride igniter technology while maintaining electrical compatibility.

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.