OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA048130NA

This is the factory OEM Direct Spark Ignition (DSI) Control Board for the Carrier PY3PPA048130NA packaged rooftop unit. As the central brain of your heating system, this microprocessor-based board orchestrates every critical function in the ignition sequence — from firing the spark igniter and opening the gas valve to managing inducer and blower motor timing, monitoring flame sensing, and triggering safety lockout when unsafe conditions are detected. When this board fails, symptoms include complete no-heat calls, ignition lockout after a failed trial for ignition, erratic blower operation, or a system that starts briefly then shuts down. Replacing it with the genuine OEM part restores factory-precise sequencing and eliminates guesswork.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | Honeywell cross-reference: 1068-11, 1068-83-119A | Factory Authorized Carrier OEM replacement
• OEM vs Generic: OEM boards are programmed to exact Carrier factory timing specifications — pre-purge, trial-for-ignition duration, retry intervals, and lockout logic. Aftermarket boards may deviate from these parameters, causing nuisance lockouts or masking real safety faults.
• Install Difficulty: 3/5 — Disconnect power and gas before servicing. Tools needed: 1/4" nut driver, Phillips screwdriver, needle-nose pliers, and a multimeter to verify 24V control signal. Label all wiring harness connections before removal. Firmware is pre-loaded — no programming required.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our climate-controlled warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY3PPA048130NA packaged rooftop gas/electric units. Also fits a wide range of Carrier, Bryant, and Payne packaged rooftop models that specify part number LH33WP003 or LH33WP003A — verify your unit's data plate before ordering. Not sure if this is your board? Our HVAC parts specialists confirm fitment before you buy. Order by 5PM for same-day shipping.