OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY2PPB042060AB

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) control board — the factory-specified replacement for the Carrier PY2PPB042060AB packaged rooftop unit. The DSI control board is the brain of the heating system: it sequences the inducer fan, fires the spark igniter, opens the gas valve, monitors the flame sensor, and supervises all safety limit switches. When this board fails, you'll typically see a hard lockout with no ignition attempt, a furnace that sparks but never lights, or erratic short-cycling with no fault pattern. Onboard LED diagnostics help pinpoint the exact fault code before you replace any secondary component.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Monitors inducer, blower, and indoor fan motors | Controls spark igniter and gas valve | Flame sensing with automatic lockout protection | LED status indicators for fault code diagnostics | Dimensions: 5 × 7 × 1.875 in
• OEM vs Generic: This OEM board is manufactured to Carrier's exact design tolerances and firmware — ensuring full compatibility with the PY2PPB042060AB's safety circuit, timing sequences, and flame-sense thresholds. Aftermarket boards may use wider tolerances that cause nuisance lockouts or missed fault detection, risking heat exchanger damage.
• Install difficulty: 3/5 — Disconnect power and gas before beginning. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, phone/camera for wiring photos. Label every wire harness before removal. Verify 24V control power is restored before startup. Recommended for qualified HVAC technicians.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as a direct-fit replacement for Carrier PY2PPB042060AB packaged rooftop units. Also replaces cross-reference part number LH33WP003A. Always verify your unit's data plate part number before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy for peace of mind.