{"product_id":"oem-goodman-m4-primary-limit-switch-for-gch90453bxaa-20162906","title":"OEM Goodman M4 Primary Limit Switch for GCH90453BXAA — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit safety control for the Goodman \u003cstrong\u003eGCH90453BXAA\u003c\/strong\u003e gas furnace. As the primary limit, it continuously senses supply-air temperature at the heat exchanger and shuts down the burners if the furnace overheats — protecting the heat exchanger, wiring, and structure. The M4-series switch is factory-calibrated to a specific trip temperature matched to your furnace's design airflow and rise.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart type: M4-series primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (opens\/closes on temperature)\u003c\/li\u003e\n\u003cli\u003eCompatibility: Goodman GCH90453BXAA and compatible 90% AFUE furnaces\u003c\/li\u003e\n\u003cli\u003eFunction: Cuts burner circuit on over-temperature; auto-resets when cool\u003c\/li\u003e\n\u003cli\u003eBrand: Genuine Goodman OEM\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe primary limit's trip point is engineered around your specific furnace. Genuine Goodman OEM ensures the exact cutout temperature and mounting geometry, avoiding nuisance trips or delayed protection. Generic limits with a different calibration can compromise both comfort and safety, so OEM is the recommended replacement.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy to Moderate.\u003c\/strong\u003e Power down the furnace, disconnect the wiring, remove the mounting screws, and install the replacement in the same orientation. Most DIYers can complete it quickly; if the original limit was tripping, have a technician confirm airflow and filter condition before returning the unit to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058051596659,"sku":"GOODMAN-9659","price":26.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-gch90453bxaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}