{"product_id":"icp-tubing-pressure-switch-for-wpg4304040lka1-oem-1178417-ships-today","title":"ICP Tubing Pressure Switch for WPG4304040LKA1 — OEM 1178417 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM tubing-style air-proving pressure switch (part number 1178417) for the ICP\/Tempstar\/Heil WPG4304040LKA1 packaged gas unit. The pressure switch monitors negative pressure created by the inducer\/draft blower and proves adequate combustion airflow before the control board allows the gas valve and igniter to fire. It is a safety-critical interlock: if the switch does not close, the unit will not ignite, protecting against incomplete combustion and carbon monoxide. Common failure symptoms include the unit locking out on ignition, the inducer running but no flame, repeated short cycling, and diagnostic fault codes indicating an open pressure switch circuit.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e1178417\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eTubing Air-Proving Pressure Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Tempstar \/ Heil \/ Comfortmaker\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eDraft\/combustion airflow proving\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003eSpade terminals with sensing tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eOEM direct replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eEngineered as a direct-fit OEM replacement for the ICP family WPG4304040LKA1 packaged gas\/electric unit and related Tempstar, Heil, and Comfortmaker models that share this combustion air-proving design. Always match the OEM part number 1178417 to confirm the correct pressure set point.\u003c\/p\u003e\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power at the disconnect and verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control\/blower access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wiring and tubing routing before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Pull the spade terminals, detach the sensing tube from the inducer port, and unscrew the switch from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new switch, reconnect the sensing tube and spade terminals per your photo, ensuring the tube is free of cracks and condensate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, start a heat cycle, and confirm the switch closes and the unit ignites normally.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eInducer runs but the burner never ignites\u003c\/li\u003e\n\u003cli\u003eFurnace locks out with an open pressure switch fault code\u003c\/li\u003e\n\u003cli\u003eShort cycling on a call for heat\u003c\/li\u003e\n\u003cli\u003eSwitch contacts stuck open or closed when tested with a meter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"ICP","offers":[{"title":"OEM","offer_id":63021517799795,"sku":"1178417","price":49.4,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047757234547,"sku":"1178417-GEN","price":38.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1178417_26eb705c-ce0f-430e-a42a-a840af2a3129.jpg?v=1782897011","url":"https:\/\/nationalhvacparts.com\/products\/icp-tubing-pressure-switch-for-wpg4304040lka1-oem-1178417-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}