OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA036060NB

The Carrier LH33WP003 is the factory-specified Direct Spark Ignition (DSI) control board for the PY3PNA036060NB packaged rooftop unit. This microprocessor-based board is the nerve center of your heating system — it orchestrates spark ignition sequencing, gas valve activation, inducer and blower motor operation, flame sensing, and automatic safety lockout. When it fails, symptoms typically include a no-heat call with no spark attempt, the unit locking out after one ignition trial, erratic blower behavior, or complete system shutdown with no 24V control signal response.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | Factory Authorized Carrier OEM replacement | Honeywell cross-reference: 1068-11, 1068-83-119A
• OEM vs Generic: This is a genuine Carrier factory-authorized board built to exact design specifications — not an aftermarket substitute. OEM boards preserve original ignition timing sequences (pre-purge, trial-for-ignition, lockout thresholds) that protect your heat exchanger and gas valve from premature wear. Aftermarket boards may deviate from factory timing, voiding equipment warranties.
• Install Difficulty: 3/5 — Requires rooftop access and disconnecting 24V and line-voltage wiring harnesses. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, multimeter (to verify 24V coil and incoming line voltage before condemning board). Always photograph all wiring connections before removal. Recommend qualified HVAC technician for gas-appliance control board replacement.
• Warranty: 1-year OEM factory warranty. Ships same business day from our climate-controlled warehouse. Securely packaged to prevent ESD and transit damage.

Compatibility: Engineered as a direct drop-in replacement for Carrier model PY3PNA036060NB packaged rooftop units. Also fits a wide range of Carrier, Bryant, and Payne packaged and split-system units using the LH33WP003/3A board — verify your unit's data plate and existing board part number before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — contact us today. In stock and ships today.