{"product_id":"oem-goodman-m4-primary-limit-switch-for-wfm18070s4bxcc-20162906","title":"OEM Goodman M4 Primary Limit Switch for WFM18070S4BXCC — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit safety control for the Goodman\/Amana \u003cstrong\u003eWFM18070S4BXCC\u003c\/strong\u003e gas furnace. Mounted on the heat-exchanger\/plenum, this primary limit monitors supply-air temperature and opens the control circuit if the furnace overheats — typically from restricted airflow, a dirty filter, or a failed blower. It protects the heat exchanger from thermal damage and prevents unsafe operation, then closes automatically once temperatures return to normal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart number: 20162906 (M4 series)\u003c\/li\u003e\n\u003cli\u003eType: Primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (temperature-sensing)\u003c\/li\u003e\n\u003cli\u003eFunction: Over-temperature cutout for the control circuit\u003c\/li\u003e\n\u003cli\u003eFits: WFM18070S4BXCC and related Goodman\/Amana furnaces\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4\" quick-connect\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis \u003cstrong\u003egenuine OEM limit\u003c\/strong\u003e uses the exact trip temperature and sensor length Goodman engineered for this furnace's cabinet. Generic substitutes with different set points or probe depths can cause short-cycling on limit or fail to protect properly. For a primary safety control, OEM is the right call.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — Turn off power, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation and probe depth. Roughly 15 minutes. If the limit trips repeatedly after replacement, check filter, blower, and ductwork for airflow restriction before continuing to run the furnace.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058225529203,"sku":"GOODMAN-14088","price":19.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-wfm18070s4bxcc-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}