OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA048130AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY3PPA048130AA packaged rooftop unit. As the brain of your system's heating sequence, this microprocessor-based board manages spark ignition, gas valve activation, combustion and blower fan motor operation, flame sensing, inducer control, and safety lockout logic. When it fails, symptoms typically include a no-heat condition, ignition lockout after a failed trial-for-ignition, erratic blower behavior, or a system that starts and immediately shuts down. Replacing with a genuine OEM board — rather than a generic substitute — ensures factory-matched timing sequences and full compatibility with your unit's safety sensors.

• Specs: Direct Spark Ignition (DSI) | Pre-Purge: 45 sec | Trial for Ignition: 5+2 sec | Retry Period: 20-sec intervals for 15 min | Post-Purge: 45 sec | Manual reset lockout | Status LED diagnostics for fault code identification
• OEM vs Generic: This is the genuine Carrier factory part (LH33WP003), engineered to Carrier's exact design specifications. Aftermarket boards such as the ICM291 offer form-fit replacements but may not replicate OEM timing tolerances or preserve full system integrity — critical on commercial rooftop applications.
• Install Difficulty: 4/5 — Shut off all power and gas before servicing. Document all wiring harness connections with photos prior to removal. Tools needed: Phillips and flat-head screwdrivers, needle-nose pliers, multimeter. Recommended for qualified HVAC technicians due to high-voltage connections and safety-circuit wiring.
• Warranty: Backed by Carrier's OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed for the Carrier PY3PPA048130AA packaged rooftop unit. Also fits select Carrier and Bryant rooftop and furnace models specifying part number LH33WP003 or LH33WP003A — always verify your unit's data plate and wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment before you buy. Order today and your part ships the same business day.