{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h524gkd100-heat-pump-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H524GKD100 — Heat Pump | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is a genuine OEM low pressure switch assembly (part 1177594) for the Tempstar T4H524GKD100 heat pump. The low pressure switch is a safety control wired into the 24V control circuit that monitors refrigerant suction pressure. If pressure drops below a safe threshold — typically from a refrigerant leak, a restriction, or a failed metering device — the switch opens and shuts down the compressor to protect it from running dry. A failed switch, or one that's correctly tripping on a low charge, will prevent the compressor from starting. Symptoms include a compressor that won't run, intermittent lockouts, or a unit that short-cycles on the pressure safety.\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\u003eCircuit\u003c\/td\u003e\n\u003ctd\u003e24V Control Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump Refrigerant Low-Pressure Cutout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDesigned for the Tempstar T4H524GKD100 and related ICP \/ Heil \/ Comfortmaker heat pumps using this low pressure cutout. Verify the OEM part number and pressure rating 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 disconnect and breaker, 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 refrigerant line and switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wiring and switch location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads; if the switch is on a Schrader-style port, unscrew it (no recovery needed), otherwise recover refrigerant before unbrazing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread or braze in the new switch, reconnect the leads per your photo, and confirm the port seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, verify proper charge, and confirm the compressor starts and the safety holds closed.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCompressor won't start \/ locked out on low pressure\u003c\/li\u003e\n\u003cli\u003eSwitch fails continuity test with adequate charge\u003c\/li\u003e\n\u003cli\u003eIntermittent short-cycling on the pressure safety\u003c\/li\u003e\n\u003cli\u003ePhysically damaged or leaking switch body\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":63021782696307,"sku":"1177594-GEN","price":34.95,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048464597363,"sku":"1177594","price":45.44,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_3fe28c02-90f0-4f5d-8499-02b1d8d580ce.jpg?v=1782960528","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h524gkd100-heat-pump-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}