OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1PJB048130AAAA

This is the OEM factory-specified Direct Spark Ignition (DSI) control board for the Carrier PY1PJB048130AAAA packaged unit. The DSI control board is the brain of your unit's heating system — it sequences the entire ignition cycle from pre-purge through flame sensing, and commands the gas valve, combustion blower, and indoor fan motor. When this board fails, you'll typically experience a no-heat condition, repeated ignition lockouts, or a furnace that attempts to light but shuts down and flashes a fault code. A failed board may also cause erratic blower behavior or a system that appears completely unresponsive to thermostat calls for heat.

• Specs: Direct Spark Ignition (DSI) microprocessor-based control | Control Voltage: 24 VAC (18–30 VAC), 60 Hz | Line Voltage: 208/230 VAC, 60 Hz | Pre-Purge: 45 seconds | Trial for Ignition: 5+2 seconds | Manual reset lockout | Compatible with LP and Natural Gas | Status LED for fault code diagnostics | Dimensions: 5 × 7 × 1.875 inches
• OEM vs Generic: This is the genuine Carrier OEM part number LH33WP003, engineered to exact factory specifications for the PY1PJB048130AAAA. OEM boards feature precise timing sequences and safety lockout thresholds calibrated to your unit — generic aftermarket boards can introduce mismatched timing that accelerates wear on the gas valve and igniter.
• Install Difficulty: 3/5 — Disconnect power and gas before starting. Label all low-voltage wiring harnesses and photograph the board before disconnecting. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter. Verify all fault codes are cleared after installation before returning unit to service.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as the direct OEM replacement for the Carrier PY1PJB048130AAAA packaged unit. Also cross-references part number LH33WP003A. Verify your existing board's part number on the label before ordering. Our HVAC specialists are available to confirm fitment — contact us before you order if you have any questions.