{"product_id":"tempstar-low-pressure-switch-for-t4h342gke100-heat-pump-refrigerant-protection-ships-today","title":"Tempstar Low Pressure Switch for T4H342GKE100 — Heat Pump Refrigerant Protection | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\n\u003cp\u003eThis is the genuine OEM Low Pressure Switch Assembly (OEM Part #1177594) for the Tempstar T4H342GKE100 heat pump. The low pressure switch is a refrigerant-side safety control that continuously monitors suction-line pressure. If pressure drops below the factory cut-out threshold — caused by a refrigerant leak, restricted metering device, or low ambient charge migration — the switch opens and interrupts the 24V control circuit to shut down the compressor before it is damaged by running in a starved condition. When pressure recovers, the auto-reset switch closes and normal operation resumes. A failed or stuck pressure switch is a leading cause of intermittent no-cool\/no-heat lockouts and short-cycling.\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\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e1177594\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDescription\u003c\/td\u003e\n\u003ctd\u003eLow Pressure Switch Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eLow Pressure, Auto-Reset\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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump \/ Condensing Unit\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\u003eEngineered as a direct OEM replacement for the Tempstar T4H342GKE100 heat pump. This switch is shared across many ICP-built Tempstar, Heil, Comfortmaker, and Carrier\/Bryant private-label condensing units of the same platform. Always confirm the printed part number 1177594 against your old switch before installing.\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 at the disconnect and breaker, then verify zero voltage at the contactor with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the condensing unit service\/corner panel to expose the refrigerant lines and switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the two control wires and their terminals before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Unplug the spade connectors. The switch is mounted on a Schrader-style fitting; back it off with a wrench while holding the fitting steady. Expect a brief refrigerant burp — the fitting is self-sealing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Thread on the new switch, snug it to the fitting, and reconnect the control wires per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power, start a call for cooling\/heating, and confirm the compressor runs without nuisance lockout.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompressor will not start or trips out on a safety\/lockout fault\u003c\/li\u003e\n\u003cli\u003eIntermittent no-cool or no-heat that clears after the unit sits\u003c\/li\u003e\n\u003cli\u003eShort-cycling on the low-pressure circuit\u003c\/li\u003e\n\u003cli\u003eSwitch fails a continuity check at normal operating pressure\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":63021793444211,"sku":"1177594-GEN","price":38.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048465187187,"sku":"1177594","price":49.4,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_2d5fef3d-26ab-48e0-83ae-e981066bafc9.jpg?v=1782960546","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-for-t4h342gke100-heat-pump-refrigerant-protection-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}