{"product_id":"oem-goodman-170-f-primary-limit-switch-for-gmnt040-3b-b1370188","title":"OEM Goodman 170°F Primary Limit Switch for GMNT040-3B — B1370188","description":"\u003ch2\u003eGoodman B1370188 170°F Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003eB1370188\u003c\/strong\u003e is an OEM 170°F primary (high) limit switch, a direct-fit safety and control component for the \u003cstrong\u003eGMNT040-3B\u003c\/strong\u003e gas furnace. The primary limit is mounted on the heat exchanger bulkhead and performs two jobs: it protects the furnace from overheating by cutting the gas valve if supply airflow is lost, and it helps govern blower on\/off timing during the heat cycle.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: Primary high-limit temperature switch\u003c\/li\u003e\n\u003cli\u003eTrip temperature: 170°F (open on rise)\u003c\/li\u003e\n\u003cli\u003eContact configuration: Normally closed, opens on temperature rise\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GMNT040-3B furnace\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (recloses on cooldown)\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: B1370188\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe 170°F trip point on this primary limit is precisely matched to the GMNT040-3B's heat exchanger and blower table. A generic switch with a different setpoint or disc size can cause short-cycling on high limit, poor temperature rise, or inadequate overheat protection. Genuine Goodman OEM guarantees the correct calibration and bracket fit.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy — DIY-friendly.\u003c\/strong\u003e The limit mounts with two screws to the exchanger panel and uses quick-connect terminals. Always disconnect power first and confirm the disc seats flush against the panel. If the limit is opening, verify filter, airflow, and blower operation before replacing.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058127651187,"sku":"GOODMAN-11619","price":12.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-170-f-primary-limit-switch-for-gmnt040-3b-b1370188","provider":"National HVAC Parts","version":"1.0","type":"link"}