{"product_id":"tempstar-low-pressure-switch-for-t4h560gkd300-oem-1177594-ships-today","title":"Tempstar Low Pressure Switch for T4H560GKD300 — OEM 1177594 | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThe OEM Tempstar Low Pressure Switch Assembly (part number 1177594) is a refrigerant-side safety control that protects the compressor on your T4H560GKD300 heat pump. It senses suction-line pressure and opens the 24V control circuit whenever pressure drops below a safe threshold — a condition caused by low charge, a refrigerant leak, restricted airflow, or a failing metering device. By interrupting the circuit, the switch prevents the compressor from running under a loss-of-charge condition that would otherwise lead to overheating and catastrophic failure. A faulty low pressure switch typically presents as a heat pump that won't start, short-cycles, locks out on a pressure fault, or runs only intermittently in cold weather.\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\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 family)\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\u003eLoss-of-charge \/ low-suction safety cutout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReset\u003c\/td\u003e\n\u003ctd\u003eAutomatic\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\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eA direct OEM fit for the Tempstar T4H560GKD300 heat pump and related ICP \/ Heil \/ Comfortmaker systems that use switch assembly 1177594. Verify the existing part number and refrigerant fitting style before ordering.\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 verify zero voltage with a multimeter before touching any wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the outdoor unit service panel to expose the refrigerant lines and switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wire connections and the switch's plumbing location.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Recover or isolate refrigerant per EPA rules if the switch is brazed; for Schrader-mount assemblies, unthread the switch and disconnect the spade terminals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new 1177594 switch, seal the connection, and reconnect the low-voltage leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, verify the circuit closes under normal pressure, and confirm the unit starts and runs without a pressure lockout.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHeat pump won't start or locks out on a low-pressure fault\u003c\/li\u003e\n\u003cli\u003eShort-cycling that clears when the switch is jumped (diagnostic only)\u003c\/li\u003e\n\u003cli\u003eIntermittent operation in cold weather\u003c\/li\u003e\n\u003cli\u003eVisible corrosion or damage at the switch body or terminals\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":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021781483891,"sku":"1177594-GEN","price":32.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048465645939,"sku":"1177594","price":42.84,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_0f8595e8-99ab-4f7e-8127-3f200394af22.jpg?v=1782960560","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-t4h560gkd300-oem-1177594-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}