OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RJA060115AAWA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1RJA060115AAWA packaged rooftop unit. The DSI control board is the brain of your unit's heating system — it orchestrates spark ignition sequencing, gas valve activation, combustion blower and indoor fan motor operation, flame sensing, and safety lockout logic. When this board fails, you'll typically experience a no-heat condition, repeated ignition lockouts, or a unit that attempts to light and then shuts down within seconds without ever establishing a steady flame.

• Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part # LH33WP003 | Microprocessor-based design with onboard LED fault-code diagnostics for rapid troubleshooting
• OEM vs Generic: This is the genuine Carrier factory part — not an aftermarket substitute. OEM boards are calibrated to exact ignition timing, flame-sensing thresholds, and safety lockout sequences specified for the PY1RJA060115AAWA. Aftermarket boards may introduce timing drift or incompatible lockout logic that can void equipment warranties.
• Install Difficulty: 3/5 — Requires disconnecting 120V power at the disconnect box before service. Label or photograph all harness connectors before removal. Tools needed: ¼" and 5/16" nut drivers, needle-nose pliers, multimeter (to verify 24V control circuit). Typical replacement time: 30–45 minutes for a qualified technician.
• Warranty: 1-year OEM manufacturer warranty against defects. Ships same business day from our warehouse — order by 3 PM local time for next-day delivery to most ZIP codes.

Compatibility: Engineered as the direct OEM replacement for the Carrier PY1RJA060115AAWA packaged rooftop gas/electric unit. Always verify your existing board's part number against LH33WP003 on the board label or unit data plate before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork, no return hassle.