OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA060115AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY3PPA060115AA packaged gas/electric unit. As the brain of the heating system, this microprocessor-based board orchestrates the entire ignition sequence — commanding the inducer motor, energizing the spark igniter, opening the gas valve, verifying flame via the flame-sensing rod, and managing blower motor timing. It also continuously monitors safety sensors and will shut the system down and trigger a lockout fault if an unsafe condition is detected. When this board fails, common symptoms include: no heat with no ignition attempt, repeated ignition lockouts, erratic or non-functional blower operation, or a system that starts briefly then shuts off with a fault code.

• OEM Part Number: LH33WP003 (also supersedes LH33WP003A) | Type: Direct Spark Ignition (DSI) Control Board | Function: Controls combustion sequencing, spark igniter, gas valve, blower motor, and indoor motor | Safety: Monitors trial-for-ignition timing, flame sensing, and system lockout logic
• OEM vs Generic: This is a genuine Carrier OEM board, not an aftermarket substitute. OEM boards use factory firmware and exact connector layouts, eliminating compatibility guesswork and ensuring the ignition sequence timing matches the heat exchanger design of the PY3PPA060115AA — critical for safe and efficient combustion.
• Install Difficulty: 3/5 — Disconnect power and gas before beginning. Label and photograph all wiring harness connections prior to removal. Tools needed: ¼" nut driver, Phillips screwdriver, needle-nose pliers, multimeter. Verify all fault codes are cleared after installation. Professional installation recommended if you are unfamiliar with gas appliance wiring.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our climate-controlled warehouse in original OEM packaging.

Compatibility: Designed and factory-matched for the Carrier PY3PPA060115AA packaged unit. Also compatible with select Bryant and ICP family units using the LH33WP003/LH33WP003A board — verify your unit's data plate and existing board part number before ordering. Not sure if this fits? Our HVAC parts specialists will confirm fitment before your order ships. In stock — order now for same-day dispatch.