{"product_id":"oem-goodman-m4-primary-high-limit-switch-for-acvc960403bnaa-20162907","title":"OEM Goodman M4 Primary High Limit Switch for ACVC960403BNAA — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit safety control for the \u003cstrong\u003eACVC960403BNAA\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. Mounted on the heat exchanger \/ blower deck, this primary limit continuously monitors supply-air temperature and opens the circuit to cut burner operation if the furnace overheats — typically from restricted airflow, a dirty filter, or a failing blower. Once temperatures normalize it automatically resets, restoring normal heating.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 20162906\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e M4 primary limit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Auto-reset thermal high-limit switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContacts:\u003c\/strong\u003e Normally closed (opens on overtemp)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment:\u003c\/strong\u003e Gas furnace\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit:\u003c\/strong\u003e Goodman ACVC960403BNAA (and compatible models)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe primary limit is a critical safety device factory-calibrated to a specific trip temperature. This \u003cstrong\u003egenuine OEM Goodman\u003c\/strong\u003e switch matches that setpoint exactly. A generic switch with the wrong rating can cause short-cycling or fail to protect the heat exchanger. Choose OEM for safe, reliable operation.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5)\u003c\/strong\u003e — Disconnect the two leads, remove the mounting screws, and swap in the new switch. Power and gas off before servicing; address any airflow restriction that caused the trip. When in doubt, hire a licensed technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057487495539,"sku":"GOODMAN-2848","price":14.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-high-limit-switch-for-acvc960403bnaa-20162907","provider":"National HVAC Parts","version":"1.0","type":"link"}