{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80903bxcc-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80903BXCC — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman 20162906 is a genuine OEM M4 primary (high) limit switch built for the \u003cstrong\u003eAMH80903BXCC\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. Mounted on the heat exchanger bulkhead, this auto-reset switch continuously senses supply-air temperature and opens the gas valve circuit if the furnace overheats — typically caused by restricted airflow. It automatically closes again once temperatures return to a safe range, cycling the burners off and on to protect the heat exchanger.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: M4 primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (temperature-sensing)\u003c\/li\u003e\n\u003cli\u003eFunction: Supply-air over-temperature protection\u003c\/li\u003e\n\u003cli\u003eCompatibility: Goodman\/Amana AMH80903BXCC and related furnaces\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM 20162906 ships with the exact open\/close set points and disc length Goodman specifies for this cabinet. Generic replacements with the wrong trip temperature can either short-cycle the furnace or allow it to run hot. For a primary safety limit, the genuine part is the safe choice.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty: Easy\u003c\/h3\u003e\u003cp\u003eDisconnect power, remove two mounting screws, transfer the wiring, and secure the new switch. If the limit keeps tripping, correct the airflow problem (dirty filter, closed registers, undersized ductwork, weak blower) rather than replacing the switch alone.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057631314291,"sku":"GOODMAN-5757","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80903bxcc-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}