OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA060115AB

This is the factory OEM Direct Spark Ignition (DSI) Control Board (part number LH33WP003) for the Carrier PY3PNA060115AB packaged gas/electric unit. As the brain of the heating system, this microprocessor-based board orchestrates every stage of the ignition sequence — commanding the inducer motor, opening the gas valve, firing the spark igniter, verifying flame via the flame-sensing rod, and managing timed lockout and retry sequences. When this board fails, symptoms typically include a no-heat condition, repeated ignition lockouts, an inducer motor that runs but never advances to ignition, or error codes flashing on the board's diagnostic LED.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | OEM Direct Spark Ignition (DSI) type | Microprocessor-based logic | Factory-matched timing and lockout parameters for Carrier PY3PNA060115AB
• OEM vs Generic: This is the genuine Carrier OEM board — not an aftermarket substitute. OEM boards ship with factory-calibrated ignition timing, trial-for-ignition duration, and flame-sensing thresholds. Aftermarket boards may use approximate timing values that can cause nuisance lockouts or, worse, unsafe ignition behavior.
• Install Difficulty: 3/5 — Requires disconnecting line-voltage wiring (always shut off power at the breaker and gas supply before beginning). Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, multimeter, phone/camera to photograph all wiring harness positions before removal. Note and match all terminal labels before disconnecting harnesses. Typical technician install time: 30–60 minutes.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock in our warehouse — ships same business day when ordered before 3 PM local time.

Compatibility: Engineered as the direct factory replacement for Carrier model PY3PNA060115AB packaged gas/electric units. Also fits select Bryant and Day & Night units using the LH33WP003 / LH33WP003A board. Always verify your existing board's part number against the data plate inside the unit access panel before ordering. Have a question about fit? Our HVAC parts specialists confirm compatibility before you buy — reach us via chat or phone.