OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP002 for Model PY1REA090125ACWB

This OEM Direct Spark Ignition (DSI) Control Board is the factory-specified replacement for Carrier model PY1REA090125ACWB gas furnaces. The DSI control board serves as the brain of the furnace's ignition system — sequencing the inducer motor, gas valve, spark igniter, and flame verification circuit in precise coordination. When this board fails, common symptoms include a hard lockout with no ignition attempt, intermittent no-heat calls, fault codes indicating ignition failure, or the furnace failing to progress past the inducer pre-purge stage. Replacing it with a genuine OEM board ensures factory-exact timing sequences and full diagnostic LED code functionality are restored.

• Part Number: LH33WP002 (also supersedes LH33WP-002) | Direct Spark Ignition (DSI) control board | Factory OEM Carrier replacement | 460V application
• OEM vs Generic: This is a genuine OEM Carrier board — not an aftermarket substitute. OEM boards preserve factory ignition timing tolerances, full LED fault-code diagnostics, and are required to maintain equipment warranty. Aftermarket boards may omit safety lockout logic, creating liability and callback risk.
• Install Difficulty: 3/5 — Requires disconnecting 24V low-voltage and line-voltage wiring harnesses and documenting all terminal connections before removal. Tools needed: Phillips screwdriver, 1/4" nut driver, needle-nose pliers, phone/camera for wiring photos. Always shut off power and gas at the unit before beginning. Verify all wiring is reconnected to correct terminals per the unit wiring diagram before restoring power.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for Carrier PY1REA090125ACWB gas furnace systems. Always verify your existing board's part number against LH33WP002 before ordering. Have questions about fit? Our HVAC parts specialists confirm fitment before you buy — contact us today and get your system back up and running fast.