{"product_id":"oem-goodman-m4-primary-auto-reset-limit-switch-for-amh80803bnaa-20162906","title":"OEM Goodman M4 Primary Auto-Reset Limit Switch for AMH80803BNAA — 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 built for the \u003cstrong\u003eAMH80803BNAA\u003c\/strong\u003e 80% AFUE gas furnace and compatible Goodman and Amana models. Mounted on the heat-exchanger bulkhead, this auto-reset thermal control monitors supply-plenum temperature and opens the gas-valve circuit if the furnace overheats — typically from restricted airflow, a dirty filter, or a failed blower. Once temperatures return to normal, the switch closes automatically and restores operation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eType: M4 primary high-limit switch (auto reset)\u003c\/li\u003e\n\u003cli\u003eConfiguration: Normally closed, opens on temperature rise\u003c\/li\u003e\n\u003cli\u003eFunction: Heat-exchanger \/ plenum overheat protection\u003c\/li\u003e\n\u003cli\u003eFits: Goodman\/Amana AMH80803BNAA and select 80% gas furnaces\u003c\/li\u003e\n\u003cli\u003eOEM Part: 20162906\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM vs. Generic:\u003c\/strong\u003e The primary limit is factory-calibrated to a specific cut-out temperature matched to this furnace's heat exchanger. The genuine Goodman M4 switch guarantees the correct trip point and mounting flange. Generic substitutes with mismatched setpoints risk premature heat-exchanger damage or nuisance lockouts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstall difficulty:\u003c\/strong\u003e Easy (1\/5). Remove two mounting screws, transfer the wire connectors, and reseat against the bulkhead. Disconnect power first and address any airflow restriction that caused the trip.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057615225203,"sku":"GOODMAN-5417","price":14.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-auto-reset-limit-switch-for-amh80803bnaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}