OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PNA036080ACBA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board (part# LH33WP003), the factory-specified replacement for the Carrier PY1PNA036080ACBA packaged rooftop unit. As the brain of the heating system, this integrated furnace control (IFC) board orchestrates every stage of the ignition sequence and monitors critical safety circuits throughout operation. When this board fails, symptoms typically include a complete no-heat condition, repeated ignition lockout faults, erratic blower behavior, or a system that sparks but never lights — all with no obvious mechanical cause.

• Function & Features: Manages Direct Spark Ignition (DSI) sequence including spark igniter firing, gas valve activation, blower and indoor fan motor operation, flame sensing confirmation, inducer motor control, and automatic safety lockout — all in the correct factory timing sequence.
• Microprocessor Diagnostics: Onboard status LED indicators display real-time operational mode and fault codes, allowing HVAC technicians to pinpoint failures quickly without a separate diagnostic tool.
• OEM vs Generic: This is a genuine Carrier OEM board (LH33WP003), manufactured to original factory design standards. OEM boards ensure full compatibility with all connected sensors, valves, and motors on the PY1PNA036080ACBA. Aftermarket boards (such as ICM291) may lack exact timing profiles, risking nuisance lockouts or shortened component life.
• Install Difficulty: 4/5 — Control board replacement requires isolating 24V and line-voltage wiring, photographing all terminal connections before removal, and verifying proper flame sense signal post-install. Recommended tools: ¼" nut driver, needle-nose pliers, multimeter with microamp DC mode. Always shut off gas and disconnect power at the disconnect box before servicing. Professional installation strongly advised.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY1PNA036080ACBA packaged rooftop units using the LH33WP003 DSI control board. Verify your existing board's part number on the unit data plate or the board itself before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — contact us before placing your order.