OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB048115AB

This is the factory OEM Direct Spark Ignition (DSI) control board for the Carrier PY2PNB048115AB packaged rooftop unit. The DSI control board is the brain of your system's heating operation — it orchestrates spark ignition sequencing, gas valve activation, combustion blower motor control, indoor fan staging, and continuous flame sensing. When this board fails, you may experience a no-heat condition, repeated ignition lockouts, a burner that lights and immediately shuts down, erratic blower behavior, or a unit that simply does not respond to a heating call. Replacing it with the correct OEM board (LH33WP003) restores factory-spec operation and preserves the integrity of all downstream safety functions.

• Part Type & Function: Direct Spark Ignition (DSI) Integrated Control Board | Manages spark ignition, gas valve, blower/indoor fan motors, flame sensing, induction motor control, and safety lockout sequences
• Diagnostics: Microprocessor-based design with onboard status LED indicators for fault code readout — speeds up troubleshooting for HVAC technicians in the field
• OEM vs Generic: This is the genuine Carrier OEM board engineered to exact factory specifications for the PY2PNB048115AB. Aftermarket boards may lack precise timing calibration, increasing the risk of nuisance lockouts, premature component wear, or voided equipment warranties
• Install Difficulty: 3/5 — Disconnect power and verify zero voltage before handling. Tools needed: nut driver set, needle-nose pliers, phone/camera to photograph all wiring connections before removal. Control boards on rooftop units may require panel removal; professional installation recommended
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse

Compatibility: Engineered as the factory-specified DSI control board replacement for Carrier model PY2PNB048115AB. This board is also cross-referenced across select Carrier and Bryant packaged rooftop units that share the LH33WP003 ignition control specification — verify your unit's data plate and existing board part number before ordering. Our team is available to confirm fitment before you purchase.