OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPA060100AEBA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PPA060100AEBA packaged rooftop unit. The DSI control board is the operational brain of the heating system — it sequences the inducer motor, commands the spark igniter, opens the gas valve, verifies flame presence via the flame sensor rod, and manages blower motor timing. When this board fails, common symptoms include persistent no-heat calls, ignition lockout after one or two failed trials, erratic blower behavior, or a unit that powers on but never progresses past pre-purge. Replacing it with a genuine OEM board ensures factory-matched sequencing logic and full compatibility with all safety circuits.

• Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part # LH33WP003 (also known as LH33WP003A) | 24 VAC control voltage | 208/230 VAC 60Hz system power
• OEM vs Generic: The genuine Carrier OEM board is programmed to exact factory timing parameters — pre-purge: 45 sec, trial for ignition: 5+2 sec, lockout: manual reset — eliminating the tolerance drift and sequencing mismatches common in third-party alternatives. Generic boards may void system warranties.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring harness, line-voltage blower leads, and grounding screw. Tools needed: #2 Phillips screwdriver, 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter for 24V verification. Always confirm power is off at disconnect before removal. Photograph all wiring before disconnecting.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct-fit replacement for the Carrier PY1PPA060100AEBA packaged rooftop unit. This board is also referenced under part number LH33WP003A. Verify your existing board's part number on the data label before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system heating again fast.