OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RJA048074AAWB

This is the factory OEM Direct Spark Ignition (DSI) Control Board for the Carrier PY1RJA048074AAWB packaged unit. The DSI control board is the brain of your system's heating sequence — it orchestrates the inducer motor, spark igniter, gas valve, and flame-sensing circuit in precise timed steps. When this board fails, common symptoms include a system that locks out after one or more ignition attempts, a furnace that runs the inducer but never sparks, fault codes indicating ignition failure, or a unit that simply delivers no heat despite the thermostat calling for it.

• Specs: Direct Spark Ignition (DSI) control board | OEM part number LH33WP003 | Factory-matched timing sequences, voltage thresholds, and fault-lockout logic for Carrier PY1RJA048074AAWB
• OEM vs Generic: This is a genuine Carrier OEM board, not an aftermarket substitute. OEM boards carry factory-calibrated ignition timing and flame-sense sensitivity. Generic boards frequently exhibit nuisance lockouts, incompatible fault codes, and shortened service life due to tolerance mismatches.
• Install Difficulty: 3/5 — Requires disconnecting 24V low-voltage and 120V line-voltage connectors. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone/camera to photograph all wiring before removal. Always disconnect power at the disconnect and verify with a multimeter before touching any terminals. If fault codes were present before failure, document them first.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY1RJA048074AAWB packaged units. Always cross-reference the part number on your existing board's label before ordering to confirm an exact match. Our fitment team is available to verify compatibility before you purchase — no guesswork required.