{"product_id":"oem-goodman-m4-primary-limit-switch-for-gch90704cxaa-20162906","title":"OEM Goodman M4 Primary Limit Switch for GCH90704CXAA — 20162906","description":"\u003ch2\u003eGenuine Goodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003e20162906 M4 primary limit switch\u003c\/strong\u003e is a factory-original high-limit safety control for the \u003cstrong\u003eGCH90704CXAA\u003c\/strong\u003e gas furnace. This normally-closed thermal switch monitors heat-exchanger temperature and opens the circuit to shut down the burners if the furnace overheats—protecting against a failed blower, blocked airflow, or dirty filter. A failed or nuisance-tripping limit switch is a frequent cause of no-heat and short-cycling complaints.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003eType: Primary high-limit switch (M4 series)\u003c\/li\u003e\n\u003cli\u003eConfiguration: Normally closed, auto-reset thermal cutout\u003c\/li\u003e\n\u003cli\u003eFunction: Overheat safety shutdown of burners\u003c\/li\u003e\n\u003cli\u003eMounting: Heat-exchanger \/ vestibule panel\u003c\/li\u003e\n\u003cli\u003ePrimary fit: Goodman GCH90704CXAA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM Goodman limit switch\u003c\/strong\u003e is calibrated to the exact trip temperature Goodman specified for this furnace and heat exchanger. Because this is a safety device, a generic switch with a different cutout temperature can allow overheating or cause false trips. OEM is strongly recommended for any limit control.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (3\/5).\u003c\/strong\u003e Disconnect power, remove the two mounting screws, transfer the wire leads, and mount the new switch. A multimeter is helpful to confirm continuity. Match the temperature rating and terminal orientation exactly—professional installation is advised for safety controls.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058053726579,"sku":"GOODMAN-9708","price":34.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-gch90704cxaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}