OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA036060NA

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY3PPA036060NA packaged rooftop unit. As the central intelligence of your heating system, this board orchestrates spark ignition sequencing, gas valve activation, combustion blower control, indoor fan motor timing, flame sensing, and safety lockout logic. When it fails, symptoms include a system stuck in lockout after an ignition attempt, no-heat calls with no spark at the burner, erratic blower behavior, or continuous fault LED codes with no successful ignition cycle.

• Part Type: Direct Spark Ignition (DSI) Integrated Circuit Control Board | OEM Part# LH33WP003 | Manufacturer: Carrier
• OEM vs Generic: This genuine OEM board is factory-programmed to Carrier's original timing and safety thresholds. Aftermarket boards (such as the ICM291) can substitute in a pinch but may require reconfiguration and often carry shorter warranties — OEM ensures exact fit, certified safety logic, and full system compatibility out of the box.
• Install Difficulty: 3/5 — Suitable for qualified HVAC technicians. De-energize and lockout/tagout the unit before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter for 24V control circuit verification, and a phone camera to document all wiring harness connections before disconnecting. Clear all fault codes after installation and run a full ignition cycle test.
• Warranty: 1-year OEM factory warranty against manufacturing defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PY3PPA036060NA packaged rooftop unit. This DSI board also fits a range of Carrier and Bryant commercial rooftop models that share the LH33WP003 board platform — verify your unit's data plate and existing board part number before ordering. Our team is available to confirm fitment. Order today and get same-day shipping — most in-stock orders ship within hours.