{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80604bxaa-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80604BXAA — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit control for \u003cstrong\u003eAMH80604BXAA\u003c\/strong\u003e gas furnaces. Mounted on the heat-exchanger bulkhead, this auto-reset thermal switch monitors supply-air temperature and cuts the gas valve if the furnace overheats — usually from restricted airflow, a dirty filter, or blower failure. It automatically closes again once temperatures return to normal, protecting the heat exchanger from thermal stress.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Primary (main) high-limit switch, M4 series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContacts:\u003c\/strong\u003e Normally closed, auto-reset on cool-down\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Supply-air over-temperature cutoff\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e 20162906\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Model:\u003c\/strong\u003e AMH80604BXAA and related Goodman\/Amana furnaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount:\u003c\/strong\u003e Flange-mount on heat-exchanger panel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe primary limit is calibrated to a specific open\/close temperature for your furnace's cabinet. The \u003cstrong\u003eOEM switch\u003c\/strong\u003e guarantees the correct trip point; a mismatched generic can nuisance-trip or, worse, allow overheating. As a safety-critical part, we recommend genuine OEM.\u003c\/p\u003e\u003ch3\u003eInstallation\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDifficulty: Easy to Moderate.\u003c\/strong\u003e Power off, disconnect the two wire terminals, remove the two mounting screws, and install the replacement in the same orientation — about 15–25 minutes. Clear any airflow restriction that caused the original trip before restarting.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057608114547,"sku":"GOODMAN-5213","price":32.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80604bxaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}