{"product_id":"oem-goodman-m4-primary-limit-switch-for-amec961004cnad-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMEC961004CNAD — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman 20162906 is a genuine OEM M4 primary limit switch for the AMEC961004CNAD and compatible Amana\/Goodman gas furnaces. Mounted on the heat-exchanger bulkhead, this primary high-limit control monitors supply-air temperature and interrupts the burners if the furnace overheats — typically from restricted airflow, a dirty filter, or blower failure. Unlike the manual-reset rollout switch, the primary limit is an auto-reset device that closes again once temperatures return to normal. A drifting or failed primary limit is a leading cause of short-cycling and no-heat calls.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Number: 20162906\u003c\/li\u003e\n\u003cli\u003eType: M4 primary high-limit switch (auto reset)\u003c\/li\u003e\n\u003cli\u003eFits: AMEC961004CNAD gas furnace\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman \/ Amana\u003c\/li\u003e\n\u003cli\u003eFunction: Supply-air overtemp cutout \/ heat-exchanger protection\u003c\/li\u003e\n\u003cli\u003eReset: Automatic\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM 20162906 is factory-calibrated to the exact trip and reset temperatures Goodman specifies for this cabinet and heat exchanger. Substitute switches with the wrong setpoint cause nuisance trips or fail to protect the unit. As a safety-critical control, we recommend genuine OEM only.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (3\/5).\u003c\/strong\u003e Turn off gas and power, disconnect the wiring, remove the mounting screws, and install the replacement in the same position and orientation. Confirm correct airflow and verify operation. Best handled by an HVAC technician.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057579147635,"sku":"GOODMAN-4304","price":27.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amec961004cnad-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}