{"product_id":"tempstar-low-pressure-switch-for-t4h348gke100-oem-1177594-ships-today","title":"Tempstar Low Pressure Switch for T4H348GKE100 — OEM 1177594 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is the genuine OEM low pressure switch assembly (part number 1177594) for the Tempstar T4H348GKE100 heat pump. The low pressure switch is a refrigerant-side safety that opens the 24V control circuit when suction pressure drops below its setpoint — protecting the compressor from running on a lost or low refrigerant charge, a frozen coil, or a restricted line. A failed switch either nuisance-trips and shuts the system down with a normal charge, or sticks closed and lets the compressor run unprotected. Replacing it with the correct OEM assembly keeps the safety logic accurate.\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\u003e1177594\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eLow Pressure Switch Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTempstar (ICP \/ Heil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Voltage\u003c\/td\u003e\n\u003ctd\u003e24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump Refrigerant Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDesigned as the factory replacement for the Tempstar T4H348GKE100 heat pump. The same switch assembly is used across related ICP-built Heil and Comfortmaker units sharing this refrigerant circuit. Confirm part number 1177594 and connection style against your existing switch before ordering.\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 outdoor disconnect and breaker, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to reach the switch on the suction line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wiring and the switch location before removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads and unthread the switch from its Schrader-style fitting (most units allow swap without recovering charge).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread on the new switch, confirm the seal, and reconnect the leads as photographed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, run the system, and verify the safety circuit makes and the compressor operates normally.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSystem shuts down on a low pressure fault with a verified good charge.\u003c\/li\u003e\n\u003cli\u003eCompressor will not start even though refrigerant pressure is normal.\u003c\/li\u003e\n\u003cli\u003eSwitch contacts stuck open or closed when tested with a meter.\u003c\/li\u003e\n\u003cli\u003eIntermittent nuisance trips in heating or cooling.\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":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021791314291,"sku":"1177594-GEN","price":34.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048465285491,"sku":"1177594","price":44.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_67fa5683-6797-4d6f-92f6-4987af769077.jpg?v=1782960550","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-t4h348gke100-oem-1177594-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}