{"product_id":"hh12zb180-carrier-l180-40f-3-limit-switch","title":"HH12ZB180 Carrier L180-40F 3\" Limit Switch","description":"\u003ch1\u003eHH12ZB180 Carrier L180-40F 3\" Limit Switch\u003c\/h1\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003cstrong\u003eCarrier HH12ZB180\u003c\/strong\u003e is a genuine OEM \u003cstrong\u003eL180-40F high-limit switch\u003c\/strong\u003e used in Carrier, Bryant, and Payne gas furnaces. This 3-inch insertion-depth limit switch opens at \u003cstrong\u003e180°F\u003c\/strong\u003e and automatically resets after the temperature drops by \u003cstrong\u003e40°F\u003c\/strong\u003e, protecting the heat exchanger from overheating caused by restricted airflow, dirty filters, blower failure, or over-firing.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis switch is the \u003cstrong\u003efactory-authorized replacement\u003c\/strong\u003e for older Carrier rollout and high-limit switches and installs directly into standard Carrier primary limit brackets with no modifications. It maintains original furnace safety certifications and proper cycling behavior.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGrounded product data:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e3\" insert\u003c\/strong\u003e, \u003cstrong\u003eL180-40 calibration\u003c\/strong\u003e, \u003cstrong\u003eautomatic reset\u003c\/strong\u003e, and OEM compatibility with Carrier\/Bryant\/Payne .\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e It replaces \u003cstrong\u003eHH12ZA178\u003c\/strong\u003e, \u003cstrong\u003eHH12ZA178A\u003c\/strong\u003e, \u003cstrong\u003eP331-2204\u003c\/strong\u003e, and \u003cstrong\u003eP331-2223\u003c\/strong\u003e .\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e \u003cstrong\u003eSPST\u003c\/strong\u003e, \u003cstrong\u003e3\" size\u003c\/strong\u003e, \u003cstrong\u003eL180-40 rating\u003c\/strong\u003e, and OEM Carrier listing .\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e \u003cstrong\u003e180°F high-limit thermostat\u003c\/strong\u003e, OEM for Carrier\/Payne, and lists the same replacement part numbers .\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference \u003c\/strong\u003e\u003c\/h2\u003e\n\u003ch3\u003e\u003cstrong\u003eDirect OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHH12ZB180 — Carrier\/Bryant\/Payne L180-40F Limit Switch\u003c\/strong\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-lg-strong pb-1 [\u0026amp;:not(:first-child)]:pt-3.5\"\u003e\u003cstrong\u003eReplaces \/ Interchange\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHH12ZA178\u003c\/strong\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eHH12ZA178A\u003c\/strong\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eP331-2204\u003c\/strong\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eP331-2223\u003c\/strong\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 class=\"text-lg-strong pb-1 [\u0026amp;:not(:first-child)]:pt-3.5\"\u003e\u003cstrong\u003eCompatible Furnace Families\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCarrier 330AAV, 331AAV, 340AAV series \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003eCarrier 58DFA070 series (multiple sub-models) \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003ePayne \u0026amp; Bryant equivalents (same OEM platform) \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"relative pb-6 w-full after:border-b after:border-stroke-300 after:w-full after:absolute after:mt-3\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnician Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTrip Temperature:\u003c\/strong\u003e 180°F\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eDifferential:\u003c\/strong\u003e 40°F (automatic reset)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eLength:\u003c\/strong\u003e 3\" insertion depth\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCircuit:\u003c\/strong\u003e SPST, normally closed (opens on temperature rise)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFunction:\u003c\/strong\u003e Protects heat exchanger from overheating\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eCommon Symptoms:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFurnace starts then stops (high-limit opening) \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003eBlower runs continuously while burners stay off (open limit) \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003eShort-cycling or failure to ignite \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eDo NOT up-rate the limit switch\u003c\/strong\u003e — using a higher temperature limit is unsafe and can damage the heat exchanger or cause fire hazard \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ps-2\"\u003e\n\u003cp\u003e\u003cspan\u003eCheck airflow issues first: dirty filter, blocked return, blower failure, or vent restriction.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eLimit control switch. L180F-40. Back plate measures 1-7\/8\" x 2-3\/4\" with two 1\/4\" spade terminals. 3\" arm length. Limit closes at 180F and opens back up at 140F. 0212R and\u003c\/p\u003e\n\u003cp\u003eReplaces 1NT23L-3644\u003c\/p\u003e\n\u003cp\u003eNew part Carrier HH12ZB180. \u003c\/p\u003e\n\u003ch3 id=\"part-num\"\u003eHH12ZB180\u003c\/h3\u003e","brand":"Quinn","offers":[{"title":"Default Title","offer_id":13004494403,"sku":"HH12ZB180","price":43.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/products\/images-2020-09-24T192703.388.jpg?v=1601000839","url":"https:\/\/hvacpartstore.com\/products\/hh12zb180-carrier-l180-40f-3-limit-switch","provider":"HVACpartstore","version":"1.0","type":"link"}