{"product_id":"oem-goodman-door-switch-w-wires-for-gmth070-4b-b1370820","title":"OEM Goodman Door Switch w\/ Wires for GMTH070-4B — B1370820","description":"\u003ch2\u003eGoodman B1370820 Blower Door Switch with Wire Harness\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eB1370820\u003c\/strong\u003e is a genuine OEM blower-door interlock switch, pre-wired with its factory harness, for the Goodman \u003cstrong\u003eGMTH070-4B\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. This safety interlock cuts power to the furnace whenever the blower access panel is removed, preventing the unit from firing with the door open. A failed or corroded door switch is a common cause of a completely dead furnace — replacing it restores the full 24V and line-voltage safety loop.\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-compartment door interlock 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\u003eFunction:\u003c\/strong\u003e Normally-open, closes when door is installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Goodman (Amana compatible)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEquipment:\u003c\/strong\u003e Gas furnace — fits GMTH070-4B\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM Goodman B1370820\u003c\/strong\u003e arrives with the correct pre-terminated harness and plunger geometry for a true drop-in fit. The \u003cstrong\u003egeneric equivalent\u003c\/strong\u003e provides the same interlock function and wiring at a reduced price — a practical option when exact harness routing isn't critical.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5).\u003c\/strong\u003e Requires removing the blower panel, unclipping the old switch, and transferring or plugging in the harness — about 20–30 minutes. Disconnect power before starting. Because this is a safety interlock, confirm the plunger actuates fully when the door is closed; a licensed technician is recommended if you're uncertain.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058166415731,"sku":"GOODMAN-12557","price":54.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-door-switch-w-wires-for-gmth070-4b-b1370820","provider":"National HVAC Parts","version":"1.0","type":"link"}