Introduction
This manual provides essential instructions for the proper installation, operation, and maintenance of the York S1-33109150000 Simplicity1A Control Board. This genuine OEM replacement part is designed for specific HVAC applications. Please read this manual thoroughly before proceeding with any installation or service to ensure safe and efficient operation.
Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read all installation and operating instructions thoroughly before installing or servicing this equipment.
- Always disconnect power to the unit before installing or servicing the control board.
- Only qualified service personnel should install or service this control board.
- Ensure all wiring connections comply with local and national electrical codes.
- Wear appropriate personal protective equipment (PPE) during installation and service.
Setup and Installation
The York S1-33109150000 Simplicity1A Control Board is a direct replacement part. Ensure the existing unit is compatible with this model before proceeding.
Pre-Installation Steps
- Power Disconnection: Turn off all electrical power to the HVAC unit at the main service panel. Verify power is off using a voltmeter.
- Access Panel Removal: Carefully remove the access panel(s) to expose the existing control board.
- Documentation: Take clear photographs of the existing wiring connections before disconnecting any wires. Label all wires as they are removed to ensure correct re-connection.
- Old Board Removal: Disconnect all wires and mounting hardware from the old control board. Carefully remove the old board.
Installation Steps
- New Board Placement: Position the new York S1-33109150000 control board in the same location as the old board. Secure it using the appropriate mounting hardware.
- Wiring Connections: Refer to your labeled wires and photographs. Connect each wire to its corresponding terminal on the new control board. Ensure all connections are secure and tight.
- Double-Check: Visually inspect all wiring connections to confirm they match the original configuration and are properly seated.

Operating Instructions
Once the control board is correctly installed and all connections are verified, the HVAC unit can be powered on.
- Restore Power: Re-apply electrical power to the HVAC unit at the main service panel.
- System Initialization: The control board will typically perform a self-diagnostic check upon power-up. Observe any indicator lights or display messages for system status.
- Test Operation: Set the thermostat to initiate a heating or cooling cycle to verify proper operation of the HVAC system. Monitor the unit for normal startup and operation.
- Observe Indicators: The board may have LED indicators for various functions (e.g., power, fault codes, operational status). Consult the specific HVAC unit's manual for detailed interpretation of these indicators.

Maintenance
The York S1-33109150000 Simplicity1A Control Board is designed for reliable operation with minimal maintenance. However, periodic inspection is recommended as part of overall HVAC system maintenance.
- Visual Inspection: During routine HVAC service, visually inspect the control board for any signs of damage, corrosion, or loose connections.
- Cleaning: If dust or debris has accumulated on the board, gently clean it using a soft brush or compressed air. Ensure power is disconnected before cleaning. Do not use liquids or abrasive cleaners.
- Connection Checks: Periodically check that all wire connections to the board remain secure.
Troubleshooting
If the HVAC system is not operating correctly after control board installation, consider the following troubleshooting steps:
- No Power:
- Check the main circuit breaker for the HVAC unit.
- Verify all power connections to the control board are secure.
- Ensure the low-voltage transformer is supplying correct voltage.
- System Not Responding:
- Confirm thermostat settings are correct and calling for heating/cooling.
- Check all low-voltage wiring connections between the thermostat and the control board.
- Inspect for any blown fuses on the control board (if applicable).
- Error Codes:
- If the control board has diagnostic LEDs, refer to the specific HVAC unit's service manual for interpretation of flash codes.
- Common issues indicated by error codes include pressure switch faults, flame sensor issues, or limit switch trips.
- Component Failure: If troubleshooting steps do not resolve the issue, and all connections are verified, the control board itself or another component in the HVAC system may be faulty. Professional diagnosis is recommended.

Specifications
| Feature | Detail |
|---|---|
| Manufacturer | York |
| Part Number | S1-33109150000 |
| Item Weight | 10.6 ounces |
| Product Dimensions | 9 x 9 x 8 inches |
| Item Model Number | S1-33109150000 |
| Item Package Quantity | 1 |
| Included Components | Replacement Part |
| Country Of Origin | United States |
Warranty Information
The manufacturer states that there is No Warranty provided with this replacement part. Please verify warranty terms with your supplier at the time of purchase.
Support
For further assistance or technical support regarding the York S1-33109150000 Simplicity1A Control Board, please contact your authorized York dealer or a qualified HVAC technician. You may also visit the official YORK Store on Amazon for product information, though direct technical support is typically handled through certified service channels.







