OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PNB024040AC

This is the genuine OEM Direct Spark Ignition (DSI) control board for the Carrier PY2PNB024040AC packaged gas unit. The DSI control board is the nerve center of your system's ignition sequence — it orchestrates the draft inducer, monitors safety circuits, fires the spark igniter, and verifies flame establishment. When this board fails, symptoms typically include a hard lockout after a failed ignition attempt, the unit cycling on and off without producing heat, erratic fault codes on the thermostat display, or a completely unresponsive heating system. Replacing it with a genuine OEM board restores factory-matched timing and safety logic.

• Specs: 24VAC control voltage | 208/230VAC 60Hz system voltage | Direct Spark Ignition (DSI) sequence | OEM Part Number LH33WP003 (supersedes LH33WP003A)
• OEM vs Generic: OEM boards carry exact factory timing parameters for ignition trial, inter-purge, and safety lockout — critical for reliable and safe operation. Aftermarket boards may use approximate timing values that can cause nuisance lockouts or, in rare cases, unsafe ignition attempts.
• Install Difficulty: 3/5 — Always disconnect power and verify 0VAC at the board before handling. Tools needed: Phillips screwdriver, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all harness connections before removal. A wiring miswire can trigger immediate safety lockout — double-check all connectors before restoring power.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a factory-direct replacement for Carrier model PY2PNB024040AC packaged gas/electric units. Also cross-references ICP part number 1171166. Verify your existing board's part number label (LH33WP003 or LH33WP003A) against your unit's data plate before ordering. Not sure it fits? Contact our HVAC parts specialists — we verify fitment before you buy.