{"product_id":"oem-goodman-furnace-door-safety-switch-w-wires-gmnt040-3b-b1370820","title":"OEM Goodman Furnace Door Safety Switch w\/ Wires GMNT040-3B — B1370820","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370820 Blower Door Safety Switch\u003c\/strong\u003e is a genuine OEM interlock switch pre-assembled \u003cstrong\u003ewith its wire harness\u003c\/strong\u003e, built for \u003cstrong\u003eGMNT040-3B\u003c\/strong\u003e gas furnaces and compatible Goodman\/Amana units. This plunger-style switch cuts power to the furnace whenever the blower access panel is removed, preventing the unit from firing with the door open — a critical safety and code requirement.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e B1370820\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Blower door interlock \/ safety cut-off switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Factory wire harness with connectors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAction:\u003c\/strong\u003e Normally open — closes when door is installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Goodman GMNT040-3B and compatible furnaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThis \u003cstrong\u003egenuine Goodman OEM\u003c\/strong\u003e switch arrives with the correct pre-terminated harness, so there's no splicing or connector guesswork. Generic door switches often ship bare and require adapting terminals, and a poor connection here means the furnace simply won't start.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Kill power at the disconnect, remove the blower panel, unclip the old switch and unplug the harness, then mount the new switch and reconnect. Confirm the plunger fully depresses when the panel is reinstalled. Roughly 15–20 minutes with a screwdriver and nut driver.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058127749491,"sku":"GOODMAN-11621","price":40.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-furnace-door-safety-switch-w-wires-gmnt040-3b-b1370820","provider":"National HVAC Parts","version":"1.0","type":"link"}