{"product_id":"oem-goodman-m4-primary-limit-switch-for-gms951155dxa-20162906","title":"OEM Goodman M4 Primary Limit Switch for GMS951155DXA — 20162906","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-temperature safety control for the \u003cstrong\u003eGMS951155DXA\u003c\/strong\u003e gas furnace and compatible GMS95-series models. This normally-closed thermal switch monitors heat-exchanger temperature and opens the gas\/ignition circuit if the furnace overheats — protecting against a failed blower, restricted airflow, or a dirty filter. A failed or nuisance-tripping limit is a frequent cause of no-heat and short-cycling calls.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003eType: M4 primary high-limit switch (auto-reset, normally closed)\u003c\/li\u003e\n\u003cli\u003eFunction: Overheat protection \/ burner lockout\u003c\/li\u003e\n\u003cli\u003eMounting: Furnace-specific bracket (direct fit)\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMS951155DXA and compatible GMS95 furnaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM limit switch\u003c\/strong\u003e is calibrated to the exact cut-out and cut-in temperatures specified for this heat exchanger, ensuring the furnace shuts down at the correct threshold. Generic universal limits require verifying trip temperature and bracket geometry, and an incorrect rating can allow unsafe operation or cause false trips. For a safety control, the genuine part is the safest choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty: Easy–Moderate\u003c\/h3\u003e\u003cp\u003eRated 2 of 5. Disconnect power, note and unplug the two spade wires, remove the mounting screws, and install the replacement in the same orientation. Restore power and confirm a full heat cycle. Best performed by a qualified HVAC technician.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eThis is a critical safety component — do not bypass a tripping limit switch. Have the root cause of any overheating diagnosed by a professional.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058154652019,"sku":"GOODMAN-12247","price":29.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-gms951155dxa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}