York S1-331-03005-000 Control Board

The York S1-331-03005-000 Control Board is a specialized Simplicity series ignition control designed for precise regulation of HVAC systems, including compatible York, Coleman, and Luxaire rooftop units and furnaces. Engineered by Johnson Controls, this genuine OEM replacement board (Part Number: 170469, 031-03005-000) manages critical operational sequences, including 2/4 stage heating and cooling cycles. It features an integrated LED diagnostic display that provides real-time "heartbeat" status and fault codes, significantly reducing troubleshooting time for field technicians. Operating on 24V power, the S1-331-03005-000 ensures reliable communication between the thermostat inputs and system components like the blower motor and gas valve. Its robust design includes low-voltage detection thresholds at 16 VAC and 19.2 VAC to protect internal circuitry and contactors from brownouts. For contractors performing legacy system repairs, this Source1 HVAC control board offers a direct-fit solution to restore OEM-standard logic and safety timings without the need for complex field modifications.

• Advanced Diagnostics: Onboard LEDs provide immediate fault-code feedback, allowing for rapid identification of ignition failures or limit switch trips.
• OEM Precision: Direct York replacement part ensures exact compatibility with Simplicity 1A control logic for multi-stage equipment.
• System Protection: Integrated low-voltage monitoring prevents contactor chatter and potential hardware damage during fluctuating power events.
• Plug-and-Play Integration: Designed for standard wiring harnesses, facilitating a streamlined swap-out process for rooftop unit maintenance.

How do I read the fault codes on this board?
The board utilizes a flashing LED "heartbeat" to indicate normal operation (1 second on, 1 second off). Rapid flashes or specific numerical sequences correspond to diagnostic codes detailed in the Simplicity service manual, such as pressure switch open or ignition lockout.

Can this board be used for both 2-stage and 4-stage systems?
Yes, the S1-331-03005-000 is engineered as a 2/4 stage control kit, making it versatile for various York and Coleman equipment configurations utilizing Simplicity series controls.

Does this board require a special mounting kit?
This board typically installs using standard standoffs or pins. When replacing older legacy boards, always verify that the mounting hole pattern matches the existing control box to ensure secure positioning.

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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.