{"product_id":"carrier-factory-authorized-parts-hh18hz195-oem-furnace-high-limit-switch-195-f-open-115-f-close-automatic-reset-temperature-safety-control","title":"Carrier Factory Authorized Parts HH18HZ195 OEM Furnace High Limit Switch – 195°F Open \/ 115°F Close – Automatic Reset Temperature Safety Control","description":"\u003cp class=\"MsoNormal\"\u003eThe Carrier Factory Authorized Parts HH18HZ195 is an OEM furnace high-temperature limit switch designed for compatible Carrier, Bryant, and Payne heating equipment. Featuring a 195°F opening temperature and 115°F closing temperature, this temperature-sensitive safety control helps protect furnace components from excessive heat.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eThe HH18HZ195 High Limit Switch monitors temperature at its installed location. When the temperature reaches approximately 195°F, the switch opens its electrical contacts, signaling the furnace control system to interrupt the applicable heating operation. Once the temperature decreases to approximately 115°F, the switch automatically closes, allowing the control system to resume operation according to its programmed safety sequence.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eDesigned for compatible gas furnace applications, this factory replacement limit switch helps maintain the manufacturer's intended temperature protection and furnace safety operation.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eKey Features \u0026amp; Function\u003c\/b\u003e\u003c\/p\u003e\n\u003cul style=\"margin-top: 0in;\" type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eBrand: Carrier Factory Authorized Parts\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eManufacturer Part Number: HH18HZ195\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eProduct Type: Furnace High Limit Switch\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eOpening Temperature: 195°F (90.6°C)\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eClosing Temperature: 115°F (46.1°C)\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eReset Type: Automatic Reset\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eTemperature differential of 80°F\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eOpens the safety circuit when the specified temperature is reached\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eAutomatically resets after cooling to the specified closing temperature\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eDesigned for compatible Carrier, Bryant, and Payne furnaces\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eOEM replacement temperature safety component\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l1 level1 lfo1; tab-stops: list .5in;\"\u003eSupports furnace overheating protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eProduct Details \u0026amp; Specifications\u003c\/b\u003e\u003c\/p\u003e\n\u003ctable class=\"MsoNormalTable\" border=\"0\" cellpadding=\"0\" style=\"mso-cellspacing: 1.5pt; mso-yfti-tbllook: 1184;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"mso-yfti-irow: 0; mso-yfti-firstrow: yes;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eSpecification\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eDetails\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 1;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eManufacturer\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eCarrier\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 2;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eBrand\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eFactory Authorized Parts\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 3;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eManufacturer Part Number\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eHH18HZ195\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 4;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eItem Number\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eHH18HZ195\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 5;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eProduct Type\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eHigh Temperature Limit Switch\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 6;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eComponent Category\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eFurnace Safety Controls\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 7;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eOpening Temperature\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003e195°F \/ 90.6°C\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 8;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eClosing Temperature\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003e115°F \/ 46.1°C\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 9;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eTemperature Differential\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003e80°F \/ 44.4°C\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 10;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eReset Function\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eAutomatic\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 11;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eNormal Contact State\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eNormally Closed (NC), subject to OEM verification\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 12;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003ePrimary Function\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eFurnace Overtemperature Protection\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 13;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eEquipment Application\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eCompatible Gas Furnaces\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 14;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eElectrical Rating\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eVerify manufacturer specifications\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 15;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eMounting Configuration\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eVerify original component\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 16;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eTerminal Configuration\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eVerify original component\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 17;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eReplacement Type\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eOEM Factory Replacement\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"mso-yfti-irow: 18; mso-yfti-lastrow: yes;\"\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eInstallation\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd style=\"padding: .75pt .75pt .75pt .75pt;\"\u003e\n\u003cp class=\"MsoNormal\"\u003eQualified HVAC Technician Recommended\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eHVAC Depot Pro Tip\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eA furnace high limit switch that repeatedly opens may indicate an overheating problem rather than a defective switch.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eBefore replacing the Carrier HH18HZ195, inspect the furnace for conditions that could restrict airflow or cause excessive temperature rise.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eCommon causes of high limit switch activation include:\u003c\/p\u003e\n\u003cul style=\"margin-top: 0in;\" type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eDirty or clogged air filters\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eRestricted return-air or supply-air ducts\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eDirty evaporator coils\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eMalfunctioning blower motors\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eIncorrect blower speed settings\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eBlocked supply registers\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eExcessive furnace temperature rise\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l2 level1 lfo2; tab-stops: list .5in;\"\u003eImproper furnace operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003eHVAC Depot Pro Tip: Always match the original limit switch's opening and closing temperatures. Installing a switch with an incorrect temperature rating can compromise the furnace's safety protection.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eImportant: Never bypass or jumper a high limit switch to operate a furnace. A repeatedly tripping limit switch requires proper diagnosis to identify the underlying overheating condition.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eDisconnect electrical power before servicing. Installation and testing should be performed by a qualified HVAC technician.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eEquipment \/ Model Compatibility\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eThe Carrier HH18HZ195 is intended for select Carrier, Bryant, and Payne gas furnaces requiring this specific temperature limit switch.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eExact compatible furnace model numbers have not been independently verified.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eBefore ordering, confirm:\u003c\/p\u003e\n\u003cul style=\"margin-top: 0in;\" type=\"disc\"\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo3; tab-stops: list .5in;\"\u003eComplete furnace model number\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo3; tab-stops: list .5in;\"\u003eFurnace serial number\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo3; tab-stops: list .5in;\"\u003eOriginal limit switch part number\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo3; tab-stops: list .5in;\"\u003e195°F opening temperature\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo3; tab-stops: list .5in;\"\u003e115°F closing temperature\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo3; tab-stops: list .5in;\"\u003eMounting configuration\u003c\/li\u003e\n\u003cli class=\"MsoNormal\" style=\"mso-list: l0 level1 lfo3; tab-stops: list .5in;\"\u003eElectrical terminal arrangement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"MsoNormal\"\u003eCompatibility Notice: HH18HZ195 is not a universal high limit switch. Matching temperature ratings alone does not guarantee compatibility with another furnace.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e \u003c\/p\u003e","brand":"Carrier","offers":[{"title":"Default Title","offer_id":54134398878059,"sku":"662441219085","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/HH18HZ195.jpg?v=1792449377","url":"https:\/\/tophvacparts.com\/products\/carrier-factory-authorized-parts-hh18hz195-oem-furnace-high-limit-switch-195-f-open-115-f-close-automatic-reset-temperature-safety-control","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}