{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80905cxca-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80905CXCA — 20162906","description":"\u003cp\u003eThe Goodman \u003cstrong\u003e20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit safety control for the Amana\/Goodman \u003cstrong\u003eAMH80905CXCA\u003c\/strong\u003e 80% AFUE gas furnace. Mounted on the heat-exchanger\/blower bulkhead, this primary limit monitors supply-air temperature and interrupts the gas valve if the furnace overheats — typically caused by restricted airflow such as a dirty filter or blower failure. The M4 disc automatically resets once temperatures return to a safe range.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart type: Primary high-limit switch (M4)\u003c\/li\u003e\n\u003cli\u003eOEM part number: 20162906\u003c\/li\u003e\n\u003cli\u003eConfiguration: Normally closed, auto-reset\u003c\/li\u003e\n\u003cli\u003eMount: Bracket-mounted disc limit\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4 in. quick-connect spade\u003c\/li\u003e\n\u003cli\u003eApplication: Goodman\/Amana 80% AFUE gas furnaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe genuine 20162906 is factory-calibrated to the exact trip temperature this furnace requires. A generic limit with the wrong setpoint or bracket profile can nuisance-trip, mis-mount, or fail to protect the heat exchanger. As a primary safety component, OEM is the only recommended replacement.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty: Easy\u003c\/h3\u003e\u003cp\u003eRated \u003cstrong\u003e2 of 5\u003c\/strong\u003e. Remove the two mounting screws, transfer the spade connectors, and install the new limit in the same orientation. If the limit trips repeatedly, diagnose airflow (filter, blower, ductwork) before assuming the switch has failed. Shut off gas and power before servicing.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eGenuine OEM Goodman part. Confirm your furnace model and limit temperature rating before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057636229491,"sku":"GOODMAN-5884","price":14.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80905cxca-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}