OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PPB042060AA

This is the genuine OEM factory-replacement Direct Spark Ignition (DSI) Control Board (part number LH33WP003) for the Carrier PY2PPB042060AA packaged rooftop unit. The DSI control board is the central intelligence of your unit's heating system — it orchestrates spark ignition, gas valve activation, combustion blower sequencing, indoor fan motor operation, and continuous flame sensing. When this board fails, the most common symptoms include a no-heat condition, repeated ignition lockouts after failed ignition attempts, the burner lighting briefly then shutting down, or a complete failure to advance through the heating sequence. Diagnostic LED fault codes on the board itself can confirm failure before ordering.

• Part Specs: Carrier OEM Part # LH33WP003 | Direct Spark Ignition (DSI) | Microprocessor-based logic | Integrated LED fault-code diagnostics | 120V input control circuit
• OEM vs Generic: This is a genuine Carrier OEM board engineered to exact factory specifications for the PY2PPB042060AA. Aftermarket boards may lack full DSI timing calibration and LED diagnostic accuracy, risking nuisance lockouts or reduced safety-shutoff responsiveness.
• Install Difficulty: 3/5 — Requires disconnecting 120V power and control wiring harnesses. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone/camera to photograph all wiring connections before removal. Note and match all terminal labels carefully. Recommend qualified HVAC technician for gas appliance work.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered for the Carrier PY2PPB042060AA packaged rooftop unit. Always verify your existing board's part number label before ordering — cross-reference with LH33WP003A if you have a revision-suffix board. Questions about fitment? Our HVAC parts specialists verify compatibility before you order — no guesswork required.