OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB048130AA

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY2PNB048130AA packaged rooftop unit. The DSI control board serves as the central brain of the heating system — managing spark ignition sequencing, gas valve activation, combustion blower and indoor fan motor operation, flame sensing, and safety lockout logic. When this board fails, common symptoms include a no-heat condition with repeated ignition attempts, the system locking out after failed ignition trials, erratic burner cycling, or a complete loss of heating function with no visible error response from the unit.

• Part Number: LH33WP003 | Carrier OEM Direct Spark Ignition (DSI) Integrated Circuit Board | Microprocessor-based design with LED status/fault indicators for rapid field diagnostics
• OEM vs Generic: This is the genuine Carrier factory part — engineered to exact OEM specifications for full compatibility with the PY2PNB048130AA. Aftermarket boards may lack proper timing calibration, fault-code support, or safety interlock precision, risking nuisance lockouts or unsafe operation.
• Install Difficulty: 3/5 — Board replacement requires disconnecting 24V control wiring, line-voltage harnesses, and flame sensor leads. Always de-energize the unit and photograph all wiring connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Recommended for qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse — no waiting on special orders.

Compatibility: Designed for the Carrier PY2PNB048130AA packaged rooftop unit. Verify your existing board's part number (LH33WP003 or LH33WP003A) against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.