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The Goodman B1370145 Rollout Limit Switch is a genuine OEM 300°F manual-reset safety control for the AMH80453ANAC gas furnace. Mounted near the burner assembly, the rollout switch opens the ignition circuit if flame rolls out of the heat exchanger — a critical safety function that shuts the furnace down before a dangerous condition can develop. A tripped or failed rollout switch must be replaced with the exact factory part.
The OEM B1370145 switch is calibrated to trip at exactly 300°F, matching the furnace's safety design. Because this is a life-safety component, using an incorrectly rated generic switch can either nuisance-trip or fail to protect against flame rollout. Always install the factory-specified part.
Easy (2/5). The switch is held by two screws with quick-connect terminals. Shut off gas and power, transfer the wires one at a time, and mount the new switch in the same orientation. Important: a rollout trip signals an underlying problem (dirty burners, blocked heat exchanger, or venting issue) — have a technician diagnose the cause before returning the furnace to service.