OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA042060NA

This is the OEM-specified Direct Spark Ignition (DSI) Control Board for the Carrier PY3PNA042060NA packaged gas/electric unit. The DSI control board is the brain of the heating system — it sequences the inducer motor, spark igniter, and gas valve while continuously monitoring the flame sensor and all safety circuits. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockout faults, the furnace starting and then shutting off within seconds, or the system failing to progress past the inducer pre-purge stage. A burned, cracked, or fault-coded board must be replaced to restore reliable heating operation.

• Part Number: LH33WP003 (also replaces LH33WP003A) | OEM Carrier DSI ignition control board | Microprocessor-based design
• OEM vs Generic: This OEM board is factory-programmed with exact ignition trial timing, flame-sensing thresholds, and lockout sequences specific to your Carrier unit. Aftermarket boards may use relaxed tolerances that cause nuisance lockouts or fail to detect unsafe flame conditions reliably.
• Install Difficulty: 3/5 — Disconnect power and gas before beginning. Photograph all wiring harness connections before removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone/camera. Verify all plug-and-play connectors seat fully. Recommended to clear any fault codes after installation.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Directly fits Carrier model PY3PNA042060NA packaged rooftop/gas-electric units. Also replaces part number LH33WP003A. Verify your existing board's part number against your unit's data plate before ordering. Not sure if this board fits your exact configuration? Our HVAC parts specialists confirm fitment before you buy — contact us before placing your order.