{"product_id":"icp-pressure-switch-for-wpg4364090lkb1-furnace-safety-switch-ships-today-1","title":"ICP Pressure Switch for WPG4364090LKB1 — Furnace Safety Switch | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis OEM pressure switch is the draft-proving safety control for the ICP\/Heil\/Tempstar WPG4364090LKB1 packaged gas furnace. It replaces OEM part \u003cstrong\u003e1178417\u003c\/strong\u003e (TUBING PRESSURE SWITCH) and ships with its sensing tubing. The switch monitors negative pressure created by the inducer blower; only when it senses proper draft does it close and allow the ignition sequence to proceed. This prevents the furnace from firing if the inducer fails or the flue\/vent is blocked, protecting against unsafe combustion.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\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\u003eOEM Part 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\u003eAir\/Draft Pressure Switch (with tubing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP (Heil \/ Tempstar \/ Comfortmaker)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eInducer draft-proving safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eGas furnace combustion safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eDirect OEM replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eDirect-fit replacement for the ICP\/Heil\/Tempstar\/Comfortmaker WPG4364090LKB1 packaged gas furnace and related units that shipped with OEM pressure switch 1178417. Match the switch's pressure rating (in. W.C.) and port configuration to your original before installing.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Shut off gas and disconnect power. Verify zero voltage at the switch terminals with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the furnace service panel to reach the inducer and switch.\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 electrical terminals and sensing hose, then unscrew the old switch from its mounting bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new switch, reconnect the tubing (no kinks), and reattach the wiring per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore gas and power, run a heat cycle, and confirm the switch closes and the furnace fires normally.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace inducer runs but ignition never starts (open switch)\u003c\/li\u003e\n\u003cli\u003eRepeated pressure-switch lockout fault codes\u003c\/li\u003e\n\u003cli\u003eShort cycling on the heat call\u003c\/li\u003e\n\u003cli\u003eSwitch fails to close with verified good draft and clear tubing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\n\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":63027211403635,"sku":"1178417","price":51.94,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047705952627,"sku":"1178417-GEN","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1178417_78af37b7-dff3-40f6-afc3-02cda1e36ccf.jpg?v=1782895140","url":"https:\/\/nationalhvacparts.com\/products\/icp-pressure-switch-for-wpg4364090lkb1-furnace-safety-switch-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}