OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RJA048115AAWB

This is the genuine OEM Direct Spark Ignition (DSI) Control Board (part number LH33WP003), factory-specified for the Carrier PY1RJA048115AAWB packaged heating and cooling unit. The DSI control board orchestrates the entire ignition sequence — managing inducer pre-purge, spark timing, gas valve opening, flame verification, and safety lockout logic. When this board fails, you'll typically experience symptoms such as a no-heat condition, continuous ignition lockout, intermittent heating faults, error codes on the thermostat, or the system failing to progress past the inducer stage.

• Specs: Direct Spark Ignition (DSI) logic board | Factory-matched for Carrier PY1RJA048115AAWB | 24V control circuit compatible | Integrated safety lockout and auto-retry logic | OEM part number: LH33WP003
• OEM vs Generic: This is a genuine Carrier OEM board, manufactured to exact factory firmware and component tolerances. Aftermarket boards may lack proper lockout timing calibration or flame-sense sensitivity, risking nuisance lockouts or unsafe ignition behavior.
• Install Difficulty: 4/5 — Requires isolation of 120V power and 24V control circuit before disassembly. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, and camera or phone to photograph all wiring harness connections prior to removal. Recommend verifying manifold gas pressure and flame sensor condition before condemning the board.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before 3PM local time ship same business day from our climate-controlled warehouse.

Compatibility: Engineered as a direct drop-in replacement for Carrier model PY1RJA048115AAWB packaged units. Always cross-reference the part number printed on your existing board's label before ordering to confirm correct firmware revision. Our HVAC parts specialists are available to verify fitment — order with confidence and get your system back online fast.