OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PNA036060ADBA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PNA036060ADBA packaged rooftop unit. The DSI control board is the operational brain of your heating system — it manages spark ignition sequencing, gas valve activation, combustion blower and indoor fan motor control, flame sensing, and safety lockout logic. When this board fails, symptoms typically include ignition lockout after a failed heating attempt, the unit failing to produce heat entirely, erratic blower behavior, or a solid/flashing fault LED indicating a diagnostic code on the board itself.

• Part Specs: OEM Part# LH33WP003 | Direct Spark Ignition (DSI) integrated control | Microprocessor-based with onboard LED fault diagnostics | Factory-matched for Carrier PY1PNA036060ADBA rooftop packaged units
• OEM vs Generic: This is the genuine Carrier-manufactured board engineered to original design specifications. Aftermarket substitutes (e.g., ICM291) may function in some applications but can lack full diagnostic code fidelity, timing precision, and long-term reliability that an OEM board provides — particularly important on commercial rooftop equipment.
• Install Difficulty: 4/5 — DSI control board replacement requires shutting off all power and gas supply before beginning. Document all wiring harness connections with photos prior to removal. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, multimeter. Recommended for qualified HVAC technicians. Always verify fault codes with the unit's service manual before condemning the board.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse — no backorder delays.

Compatibility: Designed for the Carrier PY1PNA036060ADBA packaged rooftop gas/electric unit. Verify your unit's data plate and existing board part number before ordering. Cross-reference: replaces LH33WP003A. Not sure it fits? Our HVAC parts specialists verify fitment before you place your order — contact us anytime.