OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PPA036120ACBA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1PPA036120ACBA packaged rooftop unit. As the central brain of your system's heating sequence, this integrated ignition control board manages spark ignition, gas valve activation, combustion air and blower motor sequencing, flame sensing, and safety lockout — all in one precision-engineered module. When this board fails, symptoms typically include no-heat calls, repeated ignition lockout faults, short cycling, or complete loss of system response after a call for heat.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Manages combustion, blower, and indoor fan motors | Integrated spark igniter and gas valve output control | Onboard LED fault-code diagnostics for rapid troubleshooting
• OEM vs Generic: This is a genuine Carrier OEM board — not an aftermarket substitute. OEM boards are programmed to exact factory timing sequences for ignition trial, flame proving, and lockout thresholds. Generic boards may use approximated timing that triggers nuisance lockouts or voids equipment warranties.
• Install difficulty: 3/5 — Disconnect power and gas before servicing. Photograph all wiring harness connections before removal. Tools needed: ¼" nut driver, needle-nose pliers, phone camera. Board mounts with standard sheet-metal screws; wiring connectors are keyed to prevent misconnection. Always verify for fault codes with a multimeter before condemning the board.
• Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Engineered as a direct factory replacement for the Carrier PY1PPA036120ACBA packaged rooftop unit. Also fits select additional Carrier, Bryant, and ICP commercial rooftop models that specify the LH33WP003 DSI control board — verify your unit's data plate and wiring diagram before ordering. Not sure if this is the right part? Contact our HVAC parts specialists and we'll confirm fitment before you buy. In stock — order now and this ships today.