{"product_id":"oem-goodman-m4-primary-limit-switch-for-amvm970803bnaa-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMVM970803BNAA — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM auto-reset high-limit control for the \u003cstrong\u003eAMVM970803BNAA\u003c\/strong\u003e modulating gas furnace and related Goodman, Amana, and Daikin units. Mounted on the heat-exchanger \/ blower deck, this primary limit senses supply-air temperature and opens the control circuit if the furnace overheats — typically from a dirty filter, closed registers, or a failing blower. When temperatures return to normal it resets automatically, restoring heat without a service call for routine airflow events while still protecting the heat exchanger from thermal damage.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart type:\u003c\/strong\u003e Primary high-limit switch (M4 series, auto reset)\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 AMVM970803BNAA (AMVM97 series)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Normally-closed, opens on high supply-air temp, auto reset\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Bracket\/insert on heat-exchanger panel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman (Amana\/Daikin compatible)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM 20162906\u003c\/strong\u003e carries the exact trip temperature, probe length, and mounting footprint engineered for this furnace. A universal snap-disc with the wrong setpoint or insertion depth will short-cycle the furnace or allow it to overheat. Match the OEM part for correct, safe operation.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5).\u003c\/strong\u003e Cut power, remove the two wire terminals and mounting screws, and install the replacement in the same orientation. Verify with a multimeter and address any airflow restriction (filter, coil, blower) so the new limit isn't tripping a real fault.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058004083059,"sku":"GOODMAN-20162906","price":29.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amvm970803bnaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}