OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPB042060AAAA

This OEM Direct Spark Ignition (DSI) control board is the factory-specified replacement for the Carrier PY1PPB042060AAAA packaged unit. The DSI control board is the central command module of the heating system — it sequences the inducer motor, spark igniter, gas valve, and flame sensing circuit to safely establish and sustain a burner flame. When this board fails, the most common symptoms include a no-heat condition, repeated ignition lockout, error codes on the unit's fault LED, or a furnace that sparks but never lights — or lights briefly and shuts back down within seconds.

• Specs: Direct Spark Ignition (DSI) design | 24V control circuit | Integrated flame sense input | Factory-matched timing sequences for safe ignition and lockout reset | OEM part number LH33WP003
• OEM vs Generic: This is a genuine Carrier OEM board, manufactured to exact factory timing and voltage specifications. Aftermarket boards frequently use off-tolerance ignition delay timers and inconsistent lockout logic, which can cause nuisance lockouts, unsafe retry cycles, or warranty voids on the broader system.
• Install difficulty: 3/5 — Requires disconnecting 120V and 24V wiring harnesses and documenting all terminal connections before removal. Tools needed: Phillips screwdriver, 1/4" nut driver, multimeter, phone or camera for wiring photos. Always shut off power and gas at the unit before beginning. Verify all LED fault codes are cleared after installation.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PY1PPB042060AAAA packaged unit. Verify the OEM part number LH33WP003 on your existing board's label before ordering to confirm an exact fit. Cross-reference your unit's data plate for tonnage and voltage confirmation. Our fitment team is available to verify compatibility before you order — contact us with your full model and serial number.