{"product_id":"oem-goodman-m4-primary-limit-switch-for-aces961205dnaa-20162907","title":"OEM Goodman M4 Primary Limit Switch for ACES961205DNAA — 20162906","description":"\u003cp\u003eThe Goodman \u003cstrong\u003e20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit control for the Goodman\/Amana \u003cstrong\u003eACES961205DNAA\u003c\/strong\u003e gas furnace. Mounted on the heat-exchanger bulkhead, this primary limit senses supply-air temperature and opens the gas-valve circuit if the furnace overheats — typically due to restricted airflow, a dirty filter, or a failed blower. It protects the heat exchanger from thermal stress and prevents dangerous over-temperature operation.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: M4-series primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (re-closes when temperature normalizes)\u003c\/li\u003e\n\u003cli\u003eFunction: Supply-air over-temperature protection\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman \/ Amana OEM\u003c\/li\u003e\n\u003cli\u003eDirect fit: ACES961205DNAA heat-exchanger bracket\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM M4 limit (20162906)\u003c\/strong\u003e is factory-calibrated to the trip temperature and bracket geometry for this specific furnace. Generic limits with different cut-out points or stem lengths can cause nuisance shutdowns or fail to protect the heat exchanger. For correct fit and protection, use the OEM part.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (1\/5).\u003c\/strong\u003e Disconnect two spade terminals, remove the mounting screws, and swap in the new switch. Always cut power before servicing. If the furnace was tripping on limit, correct the underlying airflow restriction (filter, ductwork, blower) before returning to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057446076787,"sku":"GOODMAN-2292","price":14.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-aces961205dnaa-20162907","provider":"National HVAC Parts","version":"1.0","type":"link"}