{"product_id":"carrier-py3gna030040ab-control-board-cyc67p","title":"OEM Carrier DSI Control Board LH33WP003 for PY3GNA030040AB","description":"\u003ch1\u003eOEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3GNA030040AB\u003c\/h1\u003e\u003cp\u003eThis OEM Direct Spark Ignition (DSI) control board is the factory-specified replacement for the \u003cstrong\u003eCarrier PY3GNA030040AB\u003c\/strong\u003e packaged heating and cooling unit. The DSI control board serves as the brain of the heating sequence — it orchestrates inducer startup, spark ignition timing, flame verification, gas valve activation, and system fault lockout logic. When this board fails, common symptoms include a complete no-heat condition, repeated ignition lockouts, failure to prove flame even when the igniter and flame sensor test good, or erratic short-cycling that cannot be traced to any individual component.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e Direct Spark Ignition (DSI) control architecture | OEM part number LH33WP003 | Factory-matched to \u003cstrong\u003eCarrier PY3GNA030040AB\u003c\/strong\u003e | Integrated fault code LED diagnostics | 24V control circuit compatible\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM vs Generic:\u003c\/strong\u003e This is a genuine OEM Carrier board — identical firmware, relay ratings, and terminal layout to what left the factory. Aftermarket boards frequently carry mismatched timing sequences and lower-rated relays, risking nuisance lockouts and premature gas valve failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall Difficulty: 4\/5\u003c\/strong\u003e — Control board replacement requires de-energizing the unit at the disconnect and breaker, photographing or labeling ALL wiring connections before removal, and verifying input\/output voltages after reinstallation. Tools needed: multimeter, 1\/4\" and 5\/16\" nut drivers, needle-nose pliers, and a phone or camera for wiring documentation. Professional installation is recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-year OEM factory warranty. In-stock and ships same business day from our warehouse when ordered before 3 PM local time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Engineered specifically for \u003cstrong\u003eCarrier model PY3GNA030040AB\u003c\/strong\u003e packaged units. Always cross-reference the OEM part number LH33WP003 printed on your existing board before ordering to confirm an exact match. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us before placing your order.\u003c\/p\u003e","brand":"Carrier","offers":[{"title":"OEM","offer_id":62640485237107,"sku":"CARRIE-PY3GNA030040AB-CONTROL_BOARD-LH33WP003","price":193.95,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":62640485269875,"sku":"CARRIE-PY3GNA030040AB-CONTROL_BOARD-LH33WP003-GEN","price":170.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-LH33WP003_110f71cc-db9c-4b7a-a528-798ec95ec7c6.jpg?v=1775028077","url":"https:\/\/nationalhvacparts.com\/products\/carrier-py3gna030040ab-control-board-cyc67p","provider":"National HVAC Parts","version":"1.0","type":"link"}