OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA060115NA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY3PNA060115NA packaged gas/electric unit. As the brain of the heating system, this microprocessor-based board orchestrates every step of the ignition sequence — from energizing the inducer motor and monitoring the pressure switch, to firing the spark igniter, opening the gas valve, and verifying flame via the flame sensor. It also controls blower timing and indoor motor operation. When this board fails, symptoms include a no-heat lockout condition, repeated ignition attempts with no flame establishment, erratic blower behavior, or a complete loss of heating function with a fault LED code on the board itself.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | Direct Spark Ignition (DSI) type | Microprocessor-based logic control
• OEM vs Generic: This genuine Carrier OEM board is factory-programmed with exact ignition trial timing, lockout thresholds, and blower delay profiles specific to the PY3PNA060115NA. Aftermarket substitutes may use generic timing curves that cause nuisance lockouts or void equipment warranties.
• Install Difficulty: 3/5 — Disconnect power and gas before servicing. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, smartphone (photograph all wiring harness connections before removal). Transfer wiring harnesses one connector at a time to avoid miswiring. Clear any lockout codes after installation.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3 PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PY3PNA060115NA. Also fits select Bryant and related ICP-family packaged units sharing the LH33WP003/LH33WP003A board. Always verify your unit's existing board part number against your equipment data plate before ordering. Have a fitment question? Our HVAC parts specialists confirm compatibility before you buy.