OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PPA030060NB

This is the genuine OEM Carrier LH33WP003 Direct Spark Ignition (DSI) Control Board — the factory-specified replacement for the Carrier PY3PPA030060NB packaged rooftop unit. The DSI control board is the brain of the heating system, orchestrating spark ignition sequencing, gas valve activation, inducer and blower motor operation, flame sensing, and safety lockout logic. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockouts, erratic burner cycling, or the unit failing to progress past the inducer pre-purge stage. LED fault codes on the board itself can help pinpoint the failure mode before replacement.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | OEM Carrier factory part | 24 VAC control voltage | 208/230 VAC 60Hz main power input
• OEM vs Generic: This is a genuine Carrier OEM board manufactured to original design specifications, ensuring full compatibility with all safety circuits, flame sensor thresholds, and timing sequences. Aftermarket boards may use non-calibrated timing that causes nuisance lockouts or unsafe ignition retries.
• Install Difficulty: 3/5 — Disconnect power and gas before starting. Tools needed: 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter, phone/camera to document wiring. Transfer wiring harnesses one connector at a time to prevent miswiring. Verify all connector latches are fully seated before restoring power.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for the Carrier PY3PPA030060NB packaged rooftop unit. Also fits other Carrier, Bryant, and ICP-family rooftop units that originally shipped with the LH33WP003 or LH33WP003A board — verify your unit's data plate and existing board part number before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy. Order now and ship today.