{"product_id":"tempstar-low-pressure-switch-assembly-for-t4h560gkd100-24v-heat-pump-safety-control-ships-today","title":"Tempstar Low Pressure Switch Assembly for T4H560GKD100 — 24V Heat Pump Safety Control | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis is the genuine OEM Low Pressure Switch Assembly (part #1177594) for the Tempstar T4H560GKD100 heat pump. The low pressure switch is a normally-closed safety control wired into the 24V control circuit that monitors refrigerant suction pressure. If pressure falls below the factory threshold — from a low charge, a restricted metering device, or a loss-of-charge leak — the switch opens and de-energizes the compressor circuit, protecting the compressor from damaging low-pressure operation. A failed or tripped switch prevents the outdoor unit from starting, causing no cooling or no heat-pump heating. Typical symptoms are a unit that hums but won't start, nuisance lockouts on cold mornings, and intermittent short-cycling.\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\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\u003eCircuit\u003c\/td\u003e\n\u003ctd\u003eNormally Closed (auto-reset)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eHeat Pump \/ Compressor Protection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect-fit replacement for the Tempstar T4H560GKD100 heat pump condensing unit, and shared across many ICP-family (Heil, Comfortmaker, Tempstar) heat pumps of this generation. Confirm OEM part number 1177594 against your unit's parts list 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 outdoor disconnect and verify zero voltage at the contactor with a multimeter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess\u003c\/strong\u003e — Remove the service panel to expose the refrigerant lines and control wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the existing switch, its leads, and its port location before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Recover or pump down as required, disconnect the two 24V leads, and remove the failed switch from its fitting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new switch on the suction-line port, reconnect the 24V leads per your photo, and leak-check.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm the unit starts and holds the call without tripping into lockout.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCompressor won't start even though the contactor pulls in\u003c\/li\u003e\n\u003cli\u003eRepeated low-pressure lockouts with a verified-good charge\u003c\/li\u003e\n\u003cli\u003eSwitch fails a continuity test at normal operating pressure\u003c\/li\u003e\n\u003cli\u003eCorroded housing, cracked body, or damaged leads\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 hassle-free returns. Backed by the National HVAC Parts fitment guarantee.\u003c\/p\u003e","brand":"Tempstar","offers":[{"title":"Direct Replacement","offer_id":63021781746035,"sku":"1177594-GEN","price":34.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048464695667,"sku":"1177594","price":44.2,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-1177594_ceef948f-d748-47bc-9d9e-f9d9124ff498.jpg?v=1782960533","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-low-pressure-switch-assembly-for-t4h560gkd100-24v-heat-pump-safety-control-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}