OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA024040AB

This OEM Direct Spark Ignition (DSI) Control Board is the factory-specified replacement for the Carrier PY3PNA024040AB packaged heating and cooling unit. The DSI control board serves as the brain of the heating sequence — it manages ignition timing, monitors the flame sensor signal, controls the inducer and blower motors, and sequences the gas valve. When this board fails, common symptoms include the unit locking out after ignition attempts, the furnace starting then shutting off after a few seconds, a no-heat condition with no apparent gas flow, or fault codes flashing on the board's diagnostic LED. Replacing with the genuine OEM board (part number LH33WP003) ensures factory-matched timing parameters, full diagnostic LED functionality, and exact connector and mounting compatibility — no wiring modifications required.

• Specs: Direct Spark Ignition (DSI) board | OEM Part No. LH33WP003 | Factory-matched ignition timing and flame-sensing thresholds | Integrated diagnostic LED fault code display | Drop-in replacement for Carrier PY3PNA024040AB
• OEM vs Generic: OEM boards carry the exact firmware, timing logic, and safety lockout parameters Carrier engineers specified at the factory. Aftermarket control boards may use approximated timing that causes nuisance lockouts, premature component wear, or voided equipment warranties.
• Install Difficulty: 3/5 — Shut off power and gas before beginning. Document all wiring harness connections with photos prior to removal. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone/camera for wiring documentation. Clear any stored fault codes after installation and verify full heat-cycle operation.
• Warranty: 1-year OEM factory warranty against defects. Orders ship same business day from our warehouse when placed before cutoff.

Compatibility: This board is the direct OEM replacement for Carrier model PY3PNA024040AB packaged units equipped with Direct Spark Ignition. Always verify your existing board's part number against LH33WP003 before ordering. Need fitment confirmation? Our HVAC parts specialists are available to verify compatibility before you buy — same-day shipping available on all in-stock OEM boards.