{"product_id":"oem-goodman-150-f-primary-limit-switch-for-wfm18140s5dncb-20162903","title":"OEM Goodman 150°F Primary Limit Switch for WFM18140S5DNCB — 20162903","description":"\u003ch2\u003eGoodman 20162903 Primary Limit Switch (150°F)\u003c\/h2\u003e\u003cp\u003eThe OEM 20162903 primary limit switch is the main high-temperature safety control for your Goodman \u003cstrong\u003eWFM18140S5DNCB\u003c\/strong\u003e furnace. Mounted on the heat-exchanger bulkhead, it monitors supply-air temperature and opens the burner circuit if airflow is lost or temperatures exceed its \u003cstrong\u003e150°F\u003c\/strong\u003e trip point — protecting the heat exchanger from cracking and preventing overheating. Unlike the manual rollout switch, this auto-reset control re-closes once temperatures return to a safe range.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: Primary high-limit switch, auto reset\u003c\/li\u003e\n\u003cli\u003eTrip temperature: 150°F (open on rise)\u003c\/li\u003e\n\u003cli\u003eConfiguration: Normally closed\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162903\u003c\/li\u003e\n\u003cli\u003eFits: Goodman WFM18140S5DNCB and compatible furnaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eLimit switches are defined by their exact trip temperature and mounting bracket geometry. The OEM Goodman 20162903 is set to the factory 150°F specification and drops directly into the original bracket. Generic substitutes with an approximate temperature rating can cause premature nuisance shutdowns or fail to protect the heat exchanger. OEM is the safe choice here.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Cut power to the furnace, remove the two mounting screws, transfer the wire leads, and secure the new switch. Ensure the sensing element seats in the airstream as originally positioned. Typical repair time 10–15 minutes.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFrequent limit trips often indicate a dirty filter or blower problem — inspect airflow before assuming a failed switch. Fitment help: info@nationalhvacparts.com.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058229461363,"sku":"GOODMAN-14157","price":26.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-150-f-primary-limit-switch-for-wfm18140s5dncb-20162903","provider":"National HVAC Parts","version":"1.0","type":"link"}