{"product_id":"oem-goodman-stack-overtemp-limit-switch-for-gmnt120-5b-b1370254","title":"OEM Goodman Stack Overtemp Limit Switch for GMNT120-5B — B1370254","description":"\u003ch2\u003eGoodman B1370254 Stack Overtemp Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1370254\u003c\/strong\u003e is a genuine OEM stack (flue) overtemp limit switch, engineered as a direct-fit replacement for the \u003cstrong\u003eGMNT120-5B\u003c\/strong\u003e gas furnace. The stack overtemp switch monitors temperature at the vent\/collector box and trips if flue gases run abnormally hot — a condition often caused by a blocked vent, restricted heat exchanger, or improper combustion. By cutting the gas circuit, it protects the vent system and heat exchanger from heat damage and helps guard against unsafe venting.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: stack \/ flue overtemp limit switch\u003c\/li\u003e\n\u003cli\u003eFunction: opens on excessive vent temperature\u003c\/li\u003e\n\u003cli\u003eReset: automatic reset on cool-down\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4 in. spade connections\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMNT120-5B furnace\u003c\/li\u003e\n\u003cli\u003eOEM part number: B1370254\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis \u003cstrong\u003egenuine OEM Goodman\u003c\/strong\u003e switch is matched to the exact trip point and mounting location of your furnace's flue system. Generic overtemp switches may carry the wrong calibration or bracket, undermining a safety function that directly affects venting integrity. For flue-related safety controls, the factory-spec part is strongly recommended.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Disconnect power, unplug the two spade terminals, remove the mounting screws at the collector box or vent, and install the new switch. Frequent tripping usually points to a venting or combustion problem — inspect the flue, inducer, and heat exchanger before replacing the switch.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFits Goodman GMNT120-5B. Disconnect power before servicing.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058131943795,"sku":"GOODMAN-11759","price":13.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-stack-overtemp-limit-switch-for-gmnt120-5b-b1370254","provider":"National HVAC Parts","version":"1.0","type":"link"}