{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80903bxcb-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80903BXCB — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM temperature-sensing safety control for \u003cstrong\u003eAmana\/Goodman AMH80903BXCB\u003c\/strong\u003e gas furnaces. Mounted in the heat-exchanger plenum, this primary limit continuously monitors supply-air temperature and shuts off the burners if the furnace overheats due to restricted airflow, a dirty filter, or blower failure. It is a first line of defense against heat-exchanger cracking and unsafe operating temperatures.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: M4 primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (temperature-based)\u003c\/li\u003e\n\u003cli\u003eFunction: Interrupts gas valve on over-temperature\u003c\/li\u003e\n\u003cli\u003eFits: Goodman \u0026amp; Amana AMH80903BXCB and compatible furnaces\u003c\/li\u003e\n\u003cli\u003eMounting: Plenum\/heat-exchanger bracket, factory footprint\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003ePrimary limits are calibrated to a specific open\/close temperature matched to your furnace's heat-exchanger design. This \u003cstrong\u003egenuine OEM M4\u003c\/strong\u003e switch guarantees the correct trip point and insertion depth. Generic substitutes risk nuisance lockouts or, worse, failing to protect the exchanger. For safety-critical controls, OEM is the recommended choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2 of 5).\u003c\/strong\u003e Cut power and gas, remove two mounting screws, transfer the wire leads, and seat the new limit at the same depth. Confirm normal cycling after install. Persistent tripping indicates an airflow problem that should be diagnosed by a technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057630658931,"sku":"GOODMAN-5747","price":27.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80903bxcb-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}