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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Amana/Goodman AMEH800805DNAA gas furnace. This high-limit / rollout switch monitors temperature and opens the circuit to shut off the burners if the furnace overheats or experiences flame rollout — a critical protection against heat-exchanger damage and fire. Because it is a manual-reset device, it must be pressed to reset after a trip, alerting the homeowner that a fault occurred and needs attention.
The OEM switch is calibrated to the exact trip temperature Goodman specified for this furnace. Because this is a life-safety component, an incorrectly rated generic switch may trip too early (nuisance shutdowns) or too late (allowing dangerous overheating). Never substitute a non-spec limit switch.
Easy to Moderate — disconnect power at the breaker, note the wire terminals, unscrew the old switch, and mount the replacement with the same orientation. Allow 20–30 minutes. If the switch tripped, have a technician diagnose the underlying cause (dirty filter, blocked flue, failing blower) before returning the furnace to service.
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