{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h442gkd100-refrigerant-safety-switch-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H442GKD100 — Refrigerant Safety Switch | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis genuine OEM low pressure switch assembly (part number 1177594) protects the compressor in your Tempstar T4H442GKD100 by monitoring suction-side refrigerant pressure. If pressure drops below the safe threshold — typically from a refrigerant leak, a stuck metering device, or a frozen coil — the switch opens and shuts the compressor down before it can run dry and self-destruct. A failed or stuck switch can cause nuisance no-cool\/no-heat lockouts, short cycling, or, worse, fail to protect the compressor during a real loss-of-charge event. Symptoms include the system refusing to start, the compressor cycling on and off rapidly, or a control board reporting a low-pressure fault.\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\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eLoss-of-charge \/ low-suction protection\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\u003eExact-fit OEM replacement for the Tempstar T4H442GKD100 and related ICP-family (Tempstar, Heil, Comfortmaker) heat pump units that use the 1177594 assembly. Verify the cut-out\/cut-in pressure rating and connection style against your existing switch before installing.\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, then verify zero voltage with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the control-area service panel to reach the switch and its refrigerant connection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wire leads and the switch's mounting\/port location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the wiring, then unthread or unseat the switch from its Schrader\/braze port (recover refrigerant if the port is not self-sealing).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Seat the new switch on the port, confirm a leak-free connection, and reconnect the leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, start the system, and confirm normal operation with no low-pressure fault.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSystem won't start and the board reports a low-pressure lockout\u003c\/li\u003e\n\u003cli\u003eCompressor short cycles even with a full refrigerant charge\u003c\/li\u003e\n\u003cli\u003eSwitch stays open (no continuity) at normal operating pressure\u003c\/li\u003e\n\u003cli\u003eVisible corrosion or damage at the switch body or terminals\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":63021785022835,"sku":"1177594-GEN","price":36.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048464367987,"sku":"1177594","price":46.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_1b55f1d4-b8f5-40a1-84aa-787bb7c2941d.jpg?v=1782960519","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h442gkd100-refrigerant-safety-switch-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}