{"product_id":"oem-goodman-m4-primary-high-limit-switch-for-amec961004cnaa-20162906","title":"OEM Goodman M4 Primary High-Limit Switch for AMEC961004CNAA — 20162906","description":"\u003cp\u003eThe Goodman \u003cstrong\u003e20162906 M4 primary limit switch\u003c\/strong\u003e is a genuine OEM temperature control for the \u003cstrong\u003eAMEC961004CNAA\u003c\/strong\u003e gas furnace. Mounted in the heat-exchanger air stream, the primary limit protects the furnace from overheating caused by restricted airflow — a clogged filter, blocked return, or failing blower. When supply air exceeds the switch's set point, it opens the control circuit to shut down the gas valve; it re-closes once temperatures return to a safe range.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: M4-series primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eAction: Opens on overtemperature, auto-reset on cooldown\u003c\/li\u003e\n\u003cli\u003eFactory-calibrated trip temperature specific to this model\u003c\/li\u003e\n\u003cli\u003eNormally closed 24V control-circuit contacts\u003c\/li\u003e\n\u003cli\u003eFit: OEM Goodman \/ Amana AMEC961004CNAA\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003egenuine OEM 20162906\u003c\/strong\u003e is matched to the exact insertion depth, set point, and bracket of the AMEC961004CNAA. Generic limits often use a different trip temperature or probe length, causing short-cycling on heat or letting the exchanger run too hot. For a primary safety limit, the correct OEM part is worth it.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5).\u003c\/strong\u003e Cut power at the breaker, open the blower\/heat-exchanger panel, disconnect the terminals, remove the mounting screws, and swap in the new switch at the same depth. Restore any airflow issues before returning to service. Have a licensed HVAC tech assist if you are not comfortable around the burner assembly.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057577705843,"sku":"GOODMAN-4272","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-high-limit-switch-for-amec961004cnaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}