OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PJB048130ABAA

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY1PJB048130ABAA packaged rooftop unit. The DSI control board is the central brain of your unit's heating system — it manages the full ignition sequence including spark timing, gas valve activation, flame sensing, and safety lockout logic. When this board fails, common symptoms include: no heat with no visible spark attempt, repeated ignition lockout faults, the system starting then shutting off unexpectedly, or total loss of heating-stage control. If your unit is stuck in a lockout condition or throwing fault codes related to ignition failure, this board is the first component to diagnose.

• Part Number: LH33WP003 (also replaces LH33WP003A) | OEM Carrier DSI Control Board | Microprocessor-based design
• OEM vs Generic: This OEM board is factory-matched to the exact timing, lockout thresholds, and flame-sensing sensitivity required by the PY1PJB048130ABAA. Aftermarket boards may use looser tolerances that lead to nuisance lockouts, premature gas valve cycling, or reduced flame-sensing reliability — always specify OEM for commercial rooftop applications.
• Install difficulty: 3/5 — Requires disconnecting 24V control wiring, gas valve leads, igniter harness, and flame sensor wire. Label all connectors before removal. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, multimeter, and camera for wiring documentation. Power down and verify zero voltage before touching any board terminals.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PY1PJB048130ABAA packaged rooftop unit. Verify your existing board's part number against LH33WP003 or LH33WP003A before ordering. Cross-references include ICM Controls ICM291 as an aftermarket equivalent. For fitment questions, our HVAC parts specialists confirm compatibility before your order ships — contact us with your full model and serial number.