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The Goodman B1370820 is a factory-original blower-compartment door interlock switch supplied with its pre-terminated wire harness, designed for the DMS80453ANA furnace and compatible Goodman/Amana units. This safety switch cuts power to the blower and control circuit whenever the blower access panel is removed, preventing operation with the door open.
The OEM Goodman assembly arrives with the correct plunger length, bracket, and pre-wired harness, so it seats and connects without splicing or guesswork. Generic switches frequently require adapting the plunger throw or re-terminating wires, and a misfit switch can leave the furnace dead or bypass the safety entirely. OEM is the reliable choice here.
Easy–Moderate (2/5). Mounts with one or two screws; connect the two supplied leads and confirm the plunger is depressed when the door is installed. Cut power at the disconnect before servicing.