{"product_id":"oem-goodman-m4-primary-limit-switch-for-amec961004cnab-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMEC961004CNAB — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe 20162906 is a genuine Goodman\/Amana M4 primary limit switch for the AMEC961004CNAB gas furnace. Mounted on the heat-exchanger bulkhead, it is the furnace's main over-temperature safety. If supply-air temperature climbs above the design limit — typically from a dirty filter, closed registers, or a failing blower — the switch opens and interrupts the gas valve to prevent heat-exchanger damage and unsafe operation. As an auto-reset control it re-closes once temperatures return to normal, allowing the furnace to resume without manual intervention.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart number: 20162906\u003c\/li\u003e\n\u003cli\u003eType: M4 primary auto-reset high-limit switch\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (temperature-based)\u003c\/li\u003e\n\u003cli\u003eFunction: Opens gas valve circuit on plenum over-temperature\u003c\/li\u003e\n\u003cli\u003eFits: AMEC961004CNAB and compatible Goodman\/Amana furnaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM 20162906 ships with the correct M4 mounting profile and the factory temperature setpoint matched to this furnace's heat exchanger. Generic substitutes risk incorrect trip points and mounting misfit. For reliable protection choose the OEM part.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (3\/5).\u003c\/strong\u003e Power off, remove the blower\/control panel, note terminal orientation, unfasten the two mounting screws, and transfer the wiring to the new switch. Verify continuity resets when cool before returning to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057578295667,"sku":"GOODMAN-4282","price":23.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amec961004cnab-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}