OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PNB036060NBAA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PNB036060NBAA packaged rooftop unit. The DSI control board is the operational brain of your heating system — it orchestrates spark ignition sequencing, gas valve activation, combustion blower and indoor fan motor control, flame sensing, and safety lockout logic. When this board fails, common symptoms include a no-heat condition, repeated ignition lockouts, blower running continuously without heat, or the unit failing to respond to thermostat calls at all. LED fault codes on the board itself will typically point directly to the failed function.

• Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part # LH33WP003 | Microprocessor-based design with onboard LED fault-code diagnostics
• OEM vs Generic: This is the genuine Carrier OEM board — factory-engineered to exact tolerances for the PY1PNB036060NBAA. Aftermarket alternatives may lack full DSI timing accuracy, increasing the risk of nuisance lockouts or premature component wear on your gas valve and igniter.
• Install Difficulty: 3/5 — Replacement requires safely disconnecting 24V control wiring harnesses, high-voltage blower leads, and gas valve connections. Always confirm power is off at the disconnect and document all wiring positions before removal. Recommend a licensed HVAC technician for rooftop packaged unit service. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, smartphone camera for wiring documentation.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct factory replacement for Carrier PY1PNB036060NBAA packaged rooftop units. Always cross-reference your unit's data plate part number against LH33WP003 before ordering. Compatible with select Carrier, Bryant, and ICP-family rooftop applications sharing this DSI board specification. Not sure if this fits your unit? Contact our HVAC parts specialists — we verify fitment before you order and ship same day.