{"product_id":"oem-goodman-m4-primary-limit-switch-for-wfm18090s5cxcb-20162906","title":"OEM Goodman M4 Primary Limit Switch for WFM18090S5CXCB — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003e20162906\u003c\/strong\u003e is a genuine OEM M4 primary (high) limit switch built as a direct-fit replacement for the \u003cstrong\u003eWFM18090S5CXCB\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. Mounted on the heat exchanger bulkhead, this temperature-sensing switch monitors supply-air heat and interrupts the burner circuit if temperatures exceed the safe setpoint — protecting against overheating from a dirty filter, failed blower, or restricted ductwork. Auto-reset operation restores the circuit once the furnace cools to a safe range.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart number: 20162906\u003c\/li\u003e\n\u003cli\u003eType: M4 primary \/ high-limit switch\u003c\/li\u003e\n\u003cli\u003eConfiguration: Normally closed, temperature auto-reset\u003c\/li\u003e\n\u003cli\u003eFits: Goodman WFM18090S5CXCB and compatible furnaces\u003c\/li\u003e\n\u003cli\u003eFunction: Supply-air high-temperature safety cutoff\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eOur \u003cstrong\u003eOEM Goodman\u003c\/strong\u003e M4 switch is calibrated to the precise open\/close temperatures matched to this furnace's heat exchanger and blower design. Generic limits with different setpoints cause short-cycling on limit or fail to protect the exchanger. For a primary safety control, use the correct OEM part.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Disconnect power and gas, remove the two mounting screws and wire terminals, and install the new 20162906 in the same orientation on the heat-exchanger panel. Restore power and confirm normal cycling. Replace any dirty filter that may have caused the original trip.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058227200371,"sku":"GOODMAN-14119","price":19.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-wfm18090s5cxcb-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}