{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80805cnaa-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80805CNAA — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906\u003c\/strong\u003e is the OEM M4 primary (high) limit switch engineered for the Amana \u003cstrong\u003eAMH80805CNAA\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. This normally-closed thermal safety control opens the burner circuit if the heat exchanger temperature climbs beyond its rated set point, protecting your furnace from overheating caused by restricted airflow, a dirty filter, or a failed blower.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: Primary high-limit safety switch (M4 series)\u003c\/li\u003e\n\u003cli\u003eAction: Auto-reset, normally closed (opens on temperature rise)\u003c\/li\u003e\n\u003cli\u003eApplication: Gas-fired warm-air furnaces\u003c\/li\u003e\n\u003cli\u003eFit: Direct OEM replacement for AMH80805CNAA\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman \/ Amana\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe genuine OEM 20162906 is calibrated to the exact trip temperature your furnace's control board and heat exchanger were designed around. Generic aftermarket limit switches may look similar but can differ in set-point tolerance, mounting bracket, and terminal placement — leading to nuisance lockouts or a switch that trips too late. For a safety-critical component, we recommend the OEM part.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e A 10–20 minute repair for most homeowners: shut off power and gas, remove the two mounting screws, transfer the spade connectors, and reinstall. Always confirm root-cause airflow issues before replacing a tripped limit. If unsure, consult a licensed HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057624629619,"sku":"GOODMAN-5605","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80805cnaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}