OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPA030060ADBA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) Control Board (part number LH33WP003), factory-specified for the Carrier PY1PPA030060ADBA packaged rooftop unit. The DSI control board is the operational brain of your unit's heating system — it manages spark ignition sequencing, gas valve activation, inducer and blower motor operation, flame sensing, and safety lockout logic. When this board fails, common symptoms include a no-heat call with no ignition attempt, the system entering hard lockout after repeated failed ignition trials, or the unit shutting down within seconds of a heat call due to a false flame-sense fault. Replacing with the correct OEM board ensures factory-timed sequencing and full safety compliance.

• Specs: Direct Spark Ignition (DSI) microprocessor-based board | Control voltage: 24 VAC (18–30 VAC), 60 Hz | Line voltage: 208/230 VAC, 60 Hz | Pre-purge: 45 sec | Trial for ignition: 5+2 sec | Retry period: every 20 sec for 15 min | Lockout: manual reset | Post-purge: 45 sec | LED fault-code diagnostics
• OEM vs. Generic: This is the genuine Carrier factory board, built to exact design tolerances. Aftermarket boards (e.g., ICM291) offer a lower-cost alternative but may exhibit timing variances that can cause nuisance lockouts or void equipment warranties. OEM is always recommended for commercial rooftop applications.
• Install difficulty: 3/5 — Disconnect all power before servicing. Tools needed: Phillips and flathead screwdrivers, needle-nose pliers, phone or camera to photograph all wiring harness connections before removal. Verify 24 VAC transformer output before condemning the board. Recommended for qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PY1PPA030060ADBA packaged rooftop unit. Also cross-references to part suffix variant LH33WP003A. Verify your unit's data plate and existing board part number before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order for peace of mind. In stock and ready to ship today.