York / Johnson Controls S1-33101975102 Defrost Control Board – Genuine OEM Heat Pump Defrost Control Board

York / Johnson Controls S1-33101975102 Defrost Control Board – Genuine OEM Heat Pump Defrost Control Board The York S1-33101975102 Defrost Control Board is a genuine OEM electronic defrost control board engineered to manage defrost operations in residential and light commercial heat pump systems. Designed to monitor outdoor coil conditions and automatically initiate defrost cycles when necessary, this control board helps maintain efficient heating performance and protects outdoor coils from excessive frost accumulation. Built to OEM specifications for precise compatibility and reliable operation, the S1-33101975102 control board coordinates compressor, outdoor fan, and reversing valve functions during defrost cycles. Its factory-programmed logic ensures proper heat pump operation, improved system efficiency, and dependable cold-weather performance. Key Features and Function: • Automatic Defrost Cycle Management – Controls heat pump defrost operation for maximum efficiency • Genuine OEM Compatibility – Designed specifically for York, Coleman, Luxaire, and Johnson Controls systems • Outdoor Coil Frost Protection – Prevents excessive frost buildup that can reduce heating capacity • Integrated System Control – Coordinates key heat pump components during defrost operation Product Details and Key Specifications: • Part Number: S1-33101975102 • Alternate Part Number: 286DB9752 • Manufacturer: Johnson Controls / York (Genuine OEM) • Part Type: Defrost Control Board • Application: Residential & Light Commercial Heat Pump Systems • Function: Controls Defrost Timing and Outdoor Unit Operation • Control Type: Electronic Defrost Control Board • Installation Type: Direct OEM Replacement • Compatible Brands: York, Coleman, Luxaire, Fraser-Johnston, Guardian • Electrical Compatibility: OEM Factory Matched • Shipping Weight: Approx. 1-2 lbs 🛠️ HVAC Depot Pro Tip: Inspect Defrost Sensors Before Replacing the Board Many defrost-related service calls are caused by failed coil sensors, damaged low-voltage wiring, or poor electrical connections rather than the control board itself. Before replacing the board, inspect all sensors and verify proper voltage to ensure accurate diagnosis. Cross-Reference & Compatibility: The S1-33101975102 is a direct OEM replacement for the following applications: • OEM Number: S1-33101975102 • Alternate Number: 286DB9752 • Application Type: Heat Pump Defrost Control Boards • Board Style: Electronic Defrost Control Board • Compatible Brands: York, Coleman, Luxaire, Fraser-Johnston, Guardian Extensive Model Compatibility List: Compatible Heat Pump Systems: • York Heat Pump Systems • Coleman Heat Pump Systems • Luxaire Heat Pump Systems • Fraser-Johnston Heat Pumps • Guardian Heat Pump Units • Residential Split-System Heat Pumps • Light Commercial Heat Pump Equipment • Select Johnson Controls HVAC Systems Always verify part number, wiring configuration, and model compatibility before ordering.