{"product_id":"oem-goodman-m4-primary-limit-switch-for-gmh951155dxab-20162906","title":"OEM Goodman M4 Primary Limit Switch for GMH951155DXAB — 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 the high-temperature safety control for the \u003cstrong\u003eGMH951155DXAB\u003c\/strong\u003e gas furnace. Mounted on the heat-exchanger housing, it opens the circuit and shuts off the burners if plenum temperature exceeds a safe threshold — protecting against a failed blower, dirty filter, or restricted airflow. A failed limit switch causes short cycling, no-heat calls, or blower lockouts.\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 (temperature) switch, M4 series\u003c\/li\u003e\n\u003cli\u003eFunction: Auto-reset thermal cutout on overheat\u003c\/li\u003e\n\u003cli\u003eWiring: 2-terminal, normally closed\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMH951155DXAB and compatible furnaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM 20162906\u003c\/strong\u003e is calibrated to the exact trip and reset temperatures Goodman specs for this heat exchanger, ensuring the furnace is protected without nuisance trips. Generic limits with different set points can either fail to protect the unit or cause premature shutdowns. This is a safety component — OEM is strongly recommended.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty: Easy to Moderate\u003c\/h3\u003e\u003cp\u003eCut power at the disconnect, unplug the two wire leads, remove the mounting screws, and install the new switch in the same orientation. Confirm continuity and correct seating before restoring power.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058123817331,"sku":"GOODMAN-11487","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-gmh951155dxab-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}