{"product_id":"oem-goodman-m4-primary-high-limit-switch-for-amh80703axcb-20162906","title":"OEM Goodman M4 Primary High Limit Switch for AMH80703AXCB — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003e20162906\u003c\/strong\u003e is a genuine OEM M4 primary high-limit switch for the \u003cstrong\u003eAMH80703AXCB\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana 80% AFUE models. Mounted on the heat-exchanger\/plenum, this temperature-sensing safety control opens the gas circuit if supply airflow is lost — from a dirty filter, failed blower, or closed ducts — protecting the heat exchanger from overheating and cracking. The M4 designation identifies the specific trip temperature and disc profile for this cabinet.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003ePart Type: Primary high-limit switch (M4 series)\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman \/ Amana\u003c\/li\u003e\n\u003cli\u003eCompatible Model: AMH80703AXCB (80% AFUE gas furnace)\u003c\/li\u003e\n\u003cli\u003eConfiguration: Normally closed, opens on high temperature\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (recloses when temp drops)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePrimary limits are calibrated to a precise cut-out temperature. The \u003cstrong\u003eOEM\u003c\/strong\u003e 20162906 carries the exact M4 rating engineered for the AMH80703 heat exchanger. Generic limits with the wrong set point cause short-cycling on limit or, dangerously, allow overheating. Match the M-code and mounting geometry — do not guess.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (1\/5)\u003c\/strong\u003e — Disconnect power, unplug the two spade terminals, remove the two mounting screws, and install the replacement in the same orientation. Correct the airflow issue that caused the trip. About 10 minutes.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057611784563,"sku":"GOODMAN-5319","price":17.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-high-limit-switch-for-amh80703axcb-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}