OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RPA120224ABWB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1RPA120224ABWB packaged rooftop unit. As the central intelligence of your heating system, this integrated circuit board orchestrates every critical combustion function — from initiating the spark ignition sequence and activating the gas valve, to controlling blower and indoor fan motors, monitoring flame sensing, managing inducer motor timing, and executing safety lockout procedures. When this board fails, symptoms typically include a complete no-heat condition, repeated ignition lockouts, erratic burner cycling, or unresponsive blower operation. Accurate LED fault codes on the board itself help technicians pinpoint the failure quickly.

• Part Type: Direct Spark Ignition (DSI) Integrated Furnace Control Board | OEM Part Number: LH33WP003 | Manufacturer: Carrier | Compatible Unit: PY1RPA120224ABWB
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to exact factory specifications, ensuring full compatibility with all sensors, safety circuits, and timing sequences. Aftermarket boards may introduce mismatched timing tolerances, nuisance lockouts, and void equipment warranties.
• Install Difficulty: 4/5 — DSI control board replacement should be performed by a licensed HVAC technician. Requires 24V control circuit shutdown, gas supply isolation, and careful documentation of all harness connections before removal. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter, camera for wiring reference photos.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse — get your system back online fast.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY1RPA120224ABWB packaged rooftop units. Always verify the part number on your existing board's label before ordering, as similar models may use variant board revisions. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us anytime.