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The Goodman B1370820 Door Interlock Switch is a genuine OEM safety component for the GMNTE120-5 gas furnace and compatible Goodman/Amana models. This normally-open interlock switch mounts on the blower compartment and automatically interrupts power to the blower and control circuit whenever the access panel is removed — a required safety interlock that prevents the furnace from operating with the door off. It arrives with factory wire leads pre-attached for a plug-and-go replacement.
Our genuine OEM B1370820 guarantees the exact throw distance, actuator geometry, and lead length the GMNTE120-5 was designed around, so the panel seats and the switch trips reliably. Lower-cost universal interlock switches often need bracket modification or lead splicing and can fail to make contact when the door is closed, leaving the furnace inoperative. For a safety device, we recommend OEM.
Easy (1/5). Disconnect power at the breaker, remove the blower panel, unplug the old switch, transfer the leads to the new switch, and re-mount. Typically a 10–15 minute job with a screwdriver. Verify the switch trips when the panel is removed before restoring power.