{"product_id":"oem-goodman-m4-primary-limit-switch-for-wfm18070s4bxcb-20162906","title":"OEM Goodman M4 Primary Limit Switch for WFM18070S4BXCB — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-temperature safety control for the Goodman\/Amana \u003cstrong\u003eWFM18070S4BXCB\u003c\/strong\u003e gas furnace. Mounted on the heat exchanger or burner bulkhead, this normally-closed thermal cutout opens the ignition\/gas circuit if plenum temperatures exceed a safe threshold — the last line of defense against overheating from a failed blower, dirty filter, or restricted airflow. A limit switch that has tripped permanently or drifted out of calibration causes short-cycling, no-heat lockouts, or nuisance shutdowns.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 20162906\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e M4 primary limit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Normally-closed automatic-reset thermal limit switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e High-temperature safety cutout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman\/Amana WFM18070S4BXCB gas furnace\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman OEM\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis \u003cstrong\u003egenuine Goodman OEM switch\u003c\/strong\u003e is factory-calibrated to the trip temperature and mounting footprint specified for this furnace. Generic limits with the wrong set point or bracket can trip early (constant lockouts) or too late (unsafe overheating). For a life-safety control, OEM is the correct choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy to Moderate\u003c\/strong\u003e — Power off, disconnect two spade terminals, remove two screws, and swap. Always confirm the underlying cause of any prior trip before returning the furnace to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058224873843,"sku":"GOODMAN-14076","price":24.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-wfm18070s4bxcb-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}