{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h436gkd100-oem-1177594-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H436GKD100 — OEM 1177594 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM Low Pressure Switch Assembly (part number 1177594) for the Tempstar T4H436GKD100 heat pump system. The low pressure switch is a refrigerant-side safety control that monitors suction-line pressure and opens the 24V control circuit if pressure drops below a safe threshold. This protects the compressor from running under a low-charge or loss-of-refrigerant condition, which would otherwise cause overheating and premature compressor failure. A failed or stuck-open low pressure switch will prevent the system from starting or cause intermittent lockouts, while a switch that fails closed removes the protection entirely.\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eRefrigerant low-pressure cutout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFit\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 replacement for the Tempstar T4H436GKD100. This assembly is shared across many ICP-family heat pumps (Tempstar, Heil, Comfortmaker) of the same generation. Confirm your existing part number reads 1177594 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 disconnect and verify zero voltage with a multimeter. Recover or pump down refrigerant if the switch is not equipped with a Schrader fitting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condenser\/control access panel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph all wire connections before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the two 24V control leads and unthread\/unclip the switch from its refrigerant port; cap the line if open.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new switch on the Schrader\/braze port, reconnect the control leads per your photo, and check for leaks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and verify the system completes a cooling cycle without nuisance lockout.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSystem will not start and the control board reports an open low-pressure circuit.\u003c\/li\u003e\n\u003cli\u003eIntermittent short-cycling or lockouts on cooling\/heat-pump mode.\u003c\/li\u003e\n\u003cli\u003eSwitch fails continuity test when refrigerant pressure is known to be normal.\u003c\/li\u003e\n\u003cli\u003eVisible corrosion, cracked housing, or damaged terminals.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eShipping \u0026amp; Returns\u003c\/h3\u003e\u003cp\u003eShips same day on orders placed before 3 PM CST. 30-day returns on unused parts. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021786005875,"sku":"1177594-GEN","price":32.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048463778163,"sku":"1177594","price":41.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_f00586e0-963b-446b-9e04-a131a24f2834.jpg?v=1782960517","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h436gkd100-oem-1177594-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}