{"product_id":"tempstar-safety-thermostat-limit-switch-for-tnls2030hde-oem-ships-today","title":"Tempstar Safety Thermostat Limit Switch for TNLS2030HDE — OEM | Ships Today","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThis OEM safety thermostat (part #51302031100, \"TSTAT SAFETY\") is a temperature-sensing limit switch that protects your Tempstar TNLS2030HDE unit from overheating and unsafe operating conditions. Unlike a wall thermostat, this safety control mounts inside the unit and opens the circuit when it senses an out-of-range temperature, shutting the system down before damage occurs. A failed safety thermostat can trip prematurely and cause nuisance shutdowns, or fail closed and lose its protective function entirely. Symptoms include short-cycling, the unit cutting out under load, or a system that runs without its safety limit responding. Replacing this control restores correct, code-compliant overtemperature protection.\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\u003e51302031100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDescription\u003c\/td\u003e\n\u003ctd\u003eThermostat, Safety (Limit Switch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eTemperature Safety Cutout\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\u003eFit\u003c\/td\u003e\n\u003ctd\u003eOEM Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cp\u003eDirect OEM fit for the Tempstar TNLS2030HDE unit and related ICP\/Heil\/Comfortmaker models that use the same safety limit thermostat. Verify the OEM part number on your existing control 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 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 safety thermostat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDocument\u003c\/strong\u003e — Photograph the wiring and mounting position before disconnecting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove\u003c\/strong\u003e — Disconnect the leads and unfasten the old safety thermostat from its mounting surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall\u003c\/strong\u003e — Mount the new control in the same location, ensuring good thermal contact, and reconnect the leads per your photo.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest\u003c\/strong\u003e — Restore power and confirm the unit runs and the safety control holds the circuit closed under normal operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eSigns You Need a Replacement\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUnit short-cycles or shuts down under normal load\u003c\/li\u003e\n\u003cli\u003eNuisance trips with no actual overheating\u003c\/li\u003e\n\u003cli\u003eSafety limit fails to open during an overtemperature event\u003c\/li\u003e\n\u003cli\u003eBurned, corroded, or loose terminals on the control\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":63021633372531,"sku":"51302031100-GEN","price":32.0,"currency_code":"USD","in_stock":true},{"title":"OEM","offer_id":63048487731571,"sku":"51302031100","price":41.6,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-limit-switch-snap-disc-51302031100_eb95d6db-465f-43d9-9a40-883f24d544b0.jpg?v=1782961324","url":"https:\/\/nationalhvacparts.com\/products\/tempstar-safety-thermostat-limit-switch-for-tnls2030hde-oem-ships-today","provider":"National HVAC Parts","version":"1.0","type":"link"}