{"product_id":"oem-goodman-140f-stack-overtemp-limit-switch-for-gmpn040-3-b1370253","title":"OEM Goodman 140F Stack Overtemp Limit Switch for GMPN040-3 — B1370253","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370253 Stack Overtemp Switch\u003c\/strong\u003e is a genuine OEM 140°F limit control for \u003cstrong\u003eGMPN040-3\u003c\/strong\u003e gas furnaces. Mounted on the vent\/flue stack, it monitors flue temperature and interrupts furnace operation if the draft or venting system overheats — a common protection against blocked vents, inducer failures, and improper draft that could allow flue-gas spillage.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e B1370253\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Stack \/ flue overtemp limit switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrip Temperature:\u003c\/strong\u003e 140°F (open on rise)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Normally closed, opens on overtemp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GMPN040-3 gas furnace\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman \/ Amana (Daikin)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eGoodman OEM ensures the exact 140°F calibration and mounting footprint your furnace's flue assembly requires. Generic substitutes with mismatched trip points can cause nuisance shutdowns or, worse, fail to catch a venting fault. For a flue-safety device, the OEM part is the reliable choice.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Mounts with existing screws and connects via spade terminals. Cut power to the furnace first. If the new switch trips, verify the flue is clear and the inducer draft is correct before returning the unit to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058141577587,"sku":"GOODMAN-B1370253","price":8.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-140f-stack-overtemp-limit-switch-for-gmpn040-3-b1370253","provider":"National HVAC Parts","version":"1.0","type":"link"}