Description
Upgrade or restore your HVAC furnace system with the York S1 6421651, a genuine OEM 2 stage control board specifically designed for SSE type furnaces. This board acts as the “brain” of your heating system — controlling ignition, blower fans, stage sequencing, safety monitoring, and overall system coordination to ensure safe, efficient, and reliable operation.
Key Features
- OEM grade control board: Manufactured by York (aka Source 1 / Johnson Controls) to match original equipment specifications for proper fit, compatibility, and manufacturer compliance.
- 2 Stage, Non Communicating (Ver 4.4): Supports two stage heating/cooling systems for efficient power modulation — ideal for furnaces that require stage sequencing without advanced communication modules.
- Comprehensive control & safety management: Coordinates ignition, blower/fan operation, staging, and safety circuits (e.g. limit switches, pressure sensors), helping prevent unsafe operation and improving system reliability.
- Plug and play compatibility: Designed for direct replacement of older or obsolete boards in compatible York, Luxaire, Coleman, and other Johnson Controls-based furnaces (e.g. replaces older part numbers like S1 33103670040).
- Durable, OEM tested construction: Built to withstand the demands of repeated heat cycles, blower operations, and safety/monitoring functions necessary for long-term HVAC performance.
