York S1-331-02979-000 Control Board

The York S1-331-02979-000 Control Board is a specialized OEM replacement part designed for integration into York, Source 1, and Johnson Controls HVAC systems, particularly high-efficiency heat pumps and rooftop units. As a direct S1-331-09171-000 replacement, this Simplicity Kit 1 2/4 Pipe board serves as the primary HVAC central processing unit, orchestrating critical sequences of operation for both heating and cooling cycles. Field technicians utilize this component to manage York system diagnostics, regulating compressor anti-short cycle delays (ASCD), fan timings, and defrost logic to maintain peak thermodynamic performance.

Engineered for professional-grade HVAC circuit board troubleshooting, the S1-331-02979-000 features a clear LED "heartbeat" indicator and specific flash codes that allow contractors to identify faults in the electrical string rapidly. Whether you are dealing with a York control board error code or a total relay failure in the 2/4 pipe configuration, this board provides the precision voltage regulation required for the C1, C2, and fan harnesses. Its robust architecture is built to withstand the rigorous demands of commercial RTU environments, ensuring seamless communication across all system sensors and safeties.

• Universal Compatibility: Direct S1-331-09171-000 replacement ensures a drop-in fit for specific B2HZ and 2TP series units without manual harness modification.
• Advanced Diagnostics: On-board LED flash codes provide instant feedback on system status, reducing "ghost" troubleshooting time in the field.
• Integrated Protection: Features a dedicated Test/Reset button to zero ASCD timers, allowing for immediate mechanical testing after installation.
• Reliable Switching: High-grade solid-state relays manage high-amperage fan and compressor loads with minimal thermal loss.

Is this board a direct replacement for the S1-331-09171-000?
Yes, the S1-331-02979-000 is the officially updated version. It is designed to modernize the logic and signal processing of older control modules in York units.

How do I verify the board is functioning after installation?
Look for the green status LED "heartbeat" (1 second on, 1 second off). This confirms the microprocessor is active and the system is in a non-alarm state.

Can I use this for both 2-pipe and 4-pipe heat pump systems?
This board belongs to the Simplicity Kit 1 series and is compatible with 2/4 pipe configurations; however, technicians should always verify the specific option setup mode in the unit manual.

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.