OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PNB036090NBAA

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY1PNB036090NBAA packaged rooftop unit. As the central brain of your gas heating system, this integrated ignition control board manages spark ignition sequencing, gas valve activation, combustion blower operation, indoor blower motor timing, and continuous flame monitoring. When this board fails, symptoms typically include a no-heat condition, repeated ignition lockouts, a system that sparks but never lights, or a furnace/rooftop unit that starts then shuts down within seconds after flame is established.

• Part Specs: Carrier OEM Part # LH33WP003 | Direct Spark Ignition (DSI) type | Integrated Gas Ignition Control (IGC) board | Microprocessor-based logic with LED fault-code diagnostics | Factory-matched to Carrier PY1PNB036090NBAA rooftop unit specifications
• OEM vs Generic: This is a genuine Carrier OEM board engineered to exact factory tolerances. Aftermarket DSI boards can introduce timing variances in spark duration and gas valve delay that lead to nuisance lockouts, premature component wear, and potential warranty voids. OEM is the only choice for a safety-critical component like an ignition control board.
• Install Difficulty: 3/5 — Disconnect power and shut off gas supply before beginning. Document all wiring harness connections with photos before removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, digital multimeter. LED fault codes on the old board should be noted before power-down — they confirm the diagnosis. Allow a trained HVAC technician to perform this repair on commercial rooftop equipment.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse. Backed by our fitment guarantee — contact our team to verify compatibility before ordering.

Compatibility: Designed as the direct OEM replacement for the Carrier PY1PNB036090NBAA packaged rooftop gas/electric unit. Also fits select Carrier and Bryant rooftop models using the LH33WP003 control board — confirm your unit's data plate and existing board part number before ordering. In stock and ready to ship today — get your system back online fast.