{"product_id":"oem-goodman-m4-primary-limit-switch-for-acec961005cnaa-20162907","title":"OEM Goodman M4 Primary Limit Switch for ACEC961005CNAA — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-temperature safety control for \u003cstrong\u003eGoodman ACEC961005CNAA\u003c\/strong\u003e furnaces. Mounted on the heat exchanger or burner box, it monitors plenum temperature and shuts off the burners if the furnace overheats — the key protection against a cracked heat exchanger from restricted airflow, a dirty filter, or blower failure.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart type: Primary (high) limit switch — M4 style\u003c\/li\u003e\n\u003cli\u003eFunction: Automatic-reset over-temperature cutoff\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman (OEM)\u003c\/li\u003e\n\u003cli\u003eOEM part number: 20162906\u003c\/li\u003e\n\u003cli\u003eFits: ACEC961005CNAA and compatible Goodman\/Amana furnaces\u003c\/li\u003e\n\u003cli\u003eConnection: Factory-spec terminals for plug-and-play wiring\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eA limit switch is a calibrated safety device — its trip and reset temperatures must match the furnace design. Generic switches with the wrong setpoint can nuisance-trip (no heat) or fail to trip when needed. This OEM switch carries Goodman's exact temperature rating, restoring proper safety operation.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5).\u003c\/strong\u003e Disconnect power, photograph and transfer the two wires, then unscrew and swap the switch in its bracket. No gas work required. Verify the furnace cycles and shuts down normally after replacement. When in doubt, consult a licensed HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057166762355,"sku":"GOODMAN-162","price":14.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-acec961005cnaa-20162907","provider":"National HVAC Parts","version":"1.0","type":"link"}