{"product_id":"icp-pressure-switch-for-wpg4484090rkb1-tubing-included-ships-today-1","title":"ICP Pressure Switch for WPG4484090RKB1 — Tubing Included | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis genuine OEM pressure switch with tubing (part #1178417) is the combustion-air safety device on the ICP\/Tempstar\/Heil WPG4484090RKB1 packaged gas\/electric unit. When the induced-draft blower starts, it creates a negative pressure that the switch senses through its tubing; only when the correct draft is proven does the switch close and allow the control board to energize the igniter and gas valve. This prevents the burners from firing if the vent is blocked, the inducer has failed, or the heat exchanger is restricted. A switch that is stuck open, has cracked or clogged tubing, or has drifted out of calibration causes ignition lockouts and no-heat conditions. Replacing it with the correct OEM switch and tubing restores reliable proof-of-draft safety.\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\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\u003eAir Pressure \/ Proof-of-Draft Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eICP \/ Tempstar \/ Heil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncludes\u003c\/td\u003e\n\u003ctd\u003eSensing Tubing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eFurnace \/ Gas Heat Section\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFits Model\u003c\/td\u003e\n\u003ctd\u003eWPG4484090RKB1\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 factory replacement for the ICP, Tempstar, Heil, and Comfortmaker WPG4484090RKB1 packaged unit. Match the pressure set-point stamp and port configuration on your existing switch before installing — using the wrong set point defeats the safety function.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First\u003c\/strong\u003e — Disconnect power and shut off the gas, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control\/burner service panel to reach the switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wire terminals and tubing routing before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Pull the spade terminals, detach the tubing, and unscrew the old switch from its bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new switch, route the new tubing without kinks, and reconnect the leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and gas, run a heat cycle, and confirm the switch proves draft and the burners light.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFurnace locks out and shows a pressure-switch fault code\u003c\/li\u003e\n\u003cli\u003eInducer runs but burners never ignite\u003c\/li\u003e\n\u003cli\u003eCracked, brittle, or clogged sensing tubing\u003c\/li\u003e\n\u003cli\u003eSwitch fails to close even with proper draft confirmed\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":63027208388979,"sku":"1178417","price":42.84,"currency_code":"USD","in_stock":true},{"title":"Generic","offer_id":63047706444147,"sku":"1178417-GEN","price":32.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1178417_bb315950-a3b4-413f-8968-07b925e24c97.jpg?v=1782895173","url":"https:\/\/nationalhvacparts.com\/products\/icp-pressure-switch-for-wpg4484090rkb1-tubing-included-ships-today-1","provider":"National HVAC Parts","version":"1.0","type":"link"}