OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA048115NA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PPA048115NA packaged rooftop unit. The DSI control board is the brain of your unit's heating system — it orchestrates spark ignition sequencing, gas valve activation, inducer and blower fan motor operation, and continuous flame sensing. When this board fails, you'll commonly experience a hard lockout with no heat, repeated ignition attempts that never establish flame, or erratic blower behavior that won't clear without a manual system reset.

• Part Specs: Carrier OEM Part # LH33WP003 | Direct Spark Ignition (DSI) microprocessor-based control | Manages spark igniter, gas valve, inducer motor, blower motor, and safety limit switches | Integrated LED fault-code diagnostics for rapid field troubleshooting
• OEM vs Generic: This is the factory-authorized Carrier OEM board, manufactured to original design tolerances. Aftermarket substitutes may replicate basic sequencing but often lack precise timing calibration — deviations in trial-for-ignition timing or lockout logic can result in nuisance shutdowns, voided equipment warranties, and potential safety hazards.
• Install Difficulty: 3/5 — Requires de-energizing the unit at the disconnect before work begins. Document all wiring harness connections with photos prior to removal. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, and a multimeter to verify 24V control circuit integrity post-install. A qualified HVAC technician is strongly recommended for gas-appliance control board replacement.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Factory-specified replacement for Carrier PY3PPA048115NA packaged rooftop gas/electric units. Also cross-references to LH33WP003A variant boards. Always verify your existing board's part number on the board label before ordering to confirm exact fitment. Have questions? Our HVAC parts specialists verify compatibility before you buy — contact us before placing your order.