OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA048130NB

This is the factory OEM Direct Spark Ignition (DSI) Control Board (part number LH33WP003), the direct factory-specified replacement for the Carrier PY3PPA048130NB packaged unit. The DSI control board is the brain of the heating system — it sequences the inducer motor, spark igniter, gas valve, and flame verification circuit in precise coordination. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockout faults, failure to prove flame even when the burner lights, or erratic cycling that cannot be resolved by resetting the thermostat.

• Specs: Direct Spark Ignition (DSI) control | Factory OEM part number LH33WP003 | 24V control circuit compatible | Engineered to factory timing and lockout specifications for the Carrier PY3PPA048130NB platform
• OEM vs Generic: This is a genuine OEM board — not an aftermarket clone. OEM boards retain exact ignition timing delays, retry logic, and lockout thresholds programmed at the factory. Generic boards frequently ship with mismatched timing parameters that cause nuisance lockouts, voided equipment warranties, and premature heat exchanger stress.
• Install Difficulty: 3/5 — Intermediate DIY or professional recommended. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter (to verify 24V control circuit), and a phone or camera to photograph all wiring harness connections before removal. Always disconnect power at the disconnect box and verify zero voltage before handling the board.
• Warranty: 1-year OEM factory warranty against defects. Orders placed by 3PM local time ship same business day from our warehouse.

Compatibility: Designed and verified for the Carrier PY3PPA048130NB packaged gas/electric unit. Cross-reference your existing board's part number against LH33WP003 before ordering, and confirm your unit's data plate voltage matches. Not sure it fits? Our HVAC parts specialists verify fitment at no charge — contact us before you order.