{"product_id":"oem-goodman-m4-primary-limit-switch-for-gds90805d2aa-20162906","title":"OEM Goodman M4 Primary Limit Switch for GDS90805D2AA — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003e20162906\u003c\/strong\u003e M4 primary limit switch is a genuine OEM safety control for the \u003cstrong\u003eGDS90805D2AA\u003c\/strong\u003e gas furnace. This thermally activated high-limit switch monitors heat-exchanger and plenum temperature, shutting off the burners if the furnace overheats due to restricted airflow, a dirty filter, or blower failure — protecting the heat exchanger and your home.\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\u003eFunction: Automatic-reset thermal cutoff\u003c\/li\u003e\n\u003cli\u003eApplication: Overheat safety protection\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GDS90805D2AA furnaces\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman (OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe genuine Goodman M4 switch is calibrated to the precise trip and reset temperatures your furnace's control board expects. A mismatched generic limit can trip too early (short-cycling, no heat) or too late (dangerous overheating). Because this is a life-safety component, the OEM part is strongly recommended.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5).\u003c\/strong\u003e Two mounting screws and two spade terminals. Turn off power at the furnace before servicing. A technician can swap it in about 15 minutes; verify the switch temperature rating matches the original.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058078040435,"sku":"GOODMAN-10372","price":21.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-gds90805d2aa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}